<p><strong>This study develops a volatile fingerprinting approach for authenticating traditional sesame oil using HS-SPME-GC-MS with GC×GC-MS-assisted compound identification. Conventional GC-MS fingerprints were evaluated by similarity analysis, while GC×GC-MS improved identification of volatile markers in authentic and adulterated samples.</strong></p><p>The method detected maize oil dilution at levels as low as 5% and sesame oil essence adulteration from 0.2%. Principal component analysis and sensory evaluation supported the fingerprint-based classification, demonstrating a reproducible strategy for detecting different types of sesame oil adulteration.</p><blockquote><h4><strong>The original article</strong></h4><h4><a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#sec0010"><strong>Volatile compound fingerprinting for traditional sesame oil authentication using GC-MS with GC×GC-MS-assisted identification&nbsp;</strong></a></h4><p>Ruibing Jin, Fuyun Kuang, Qi Meng, Lijin Wang, Huanlu Song, Xueping Feng, Mingshan Zou</p><p>Journal of Food Composition and Analysis, 2026, 155:109277</p><div><a target="_blank" rel="noopener noreferrer" href="https://doi.org/10.1016/j.jfca.2026.109277">https://doi.org/10.1016/j.jfca.2026.109277</a></div><h6>licensed under <a target="_blank" rel="noopener noreferrer" href="https://creativecommons.org/licenses/by/4.0/"><strong>CC-BY 4.0</strong></a></h6></blockquote><p><strong>Selected sections from the article follow. Formats and hyperlinks were adapted from the original.</strong></p><div><div><div><div><div><p>Sesame is cultivated worldwide for its nutritional value and flavor, especially in India, China, Myanmar, and Tanzania (<a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#bib23"><span>Yin et al., 2021</span></a>). Sesame oil (SO) is an edible oil made from sesame seeds roasted at high temperatures to produce the distinct aroma and then processed using pressing, leaching, or other methods (<a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#bib5"><span>Huang et al., 2024</span></a>, <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#bib11"><span>Ma et al., 2022</span></a>). This traditional Chinese characteristic edible oil is extremely popular among consumers because of its high nutritional value and unique flavor. The unique aroma is an important indicator of quality and the main feature that distinguishes SO from other vegetable oils. SO contains fatty acids, vitamin E, and phytosterols that support cardiovascular health and anticarcinogenic processes (<a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#bib21"><span>Xu et al., 2025</span></a>), along with sesamin and other lignans that impart strong antioxidant and anti-corticosteroid properties (<a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#bib24"><span>Yin et al., 2024</span></a>). Owing to its nutritional and sensory values, the high retail price of SO has motivated adulteration with cheaper edible oils or SO essences (SOE). Therefore, the development of SO adulteration detection technologies such as fingerprinting is essential.</p><p>Fingerprinting technology typically involves using analytical detection and data processing methods to generate chromatograms/spectra of the separate sample components simultaneously. In China, fingerprinting is primarily used in the fields of traditional Chinese medicine, biology, and food production. To ensure the quality of traditional Chinese medicines, the Chinese Pharmacopoeia Commission developed the “Chinese Medicine Chromatographic Fingerprint Spectra Similarity Evaluation System” (Fingerprint Similarity System). After importing sample chromatograms, the software generates a reference fingerprint spectrum based on the retention times and peak heights, from which the similarity between the individual samples and reference spectrum is calculated. Samples with similarities &gt; 0.900 are considered highly compatible with the reference fingerprint (<a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#bib13"><span>National Medical Products Administration, 2000</span></a>). Chromatographic fingerprinting is particularly valuable for traditional SOs and reveals how variations in raw material origin or production processes influence the overall similarity of the volatile component profiles across samples. This enables more effective adulteration detection, origin discrimination, varietal differentiation, and characteristic substance analysis (<a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#bib3"><span>Fu et al., 2023</span></a>, <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#bib14"><span>Shi et al., 2025</span></a>; <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#bib15"><span>Sun et al., 2023</span></a>).</p><p>Volatile compound fingerprinting has been employed to characterize the volatile profiles of food products, enabling product discrimination and quality assessment (including identification and grading). <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#bib16"><span>Sun et al. (2020)</span></a> analyzed volatile flavor compounds in SO and SO adulterated with soybean oil and identified characteristic compounds that can serve as indicators for adulteration. <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#bib18"><span>Wang et al. (2024a)</span></a> used UV spectral fingerprints in combination with chemometric analytical methods to assess the quality of pressed SO with different levels of adulteration with refined SO. <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#bib1"><span>Aghili et al. (2023)</span></a> analyzed the fatty acid compositions of diluted SO samples using an electronic nose (e-nose) and gas chromatography-mass spectrometry (GC-MS), revealing differences in the volatile profiles between the original and adulterated SO samples, which could aid in distinguishing adulterations. <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#bib20"><span>Xing et al. (2019)</span></a> established fatty acid fingerprints capable of identifying sesame oil adulterated with rapeseed oil at levels as low as 5%. However, the sensitivity decreased for adulteration with corn oil, where only levels above 10% were detectable. Although <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#bib26"><span>Zhang et al. (2016)</span></a> established a simple and rapid ion mobility spectrometry method to identify sesame oil adulterated with flavoring substances, its detection capability is limited to adulteration levels above 10%. However, few studies have assessed the performance of GC-MS-based fingerprinting in the concurrent detection of SO dilution and essence adulteration from volatile profiles.</p><p>Although the chromatographic fingerprint similarity evaluation system was originally developed for traditional Chinese medicines, it has recently been successfully applied to edible oils. For example, <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#bib7"><span>Li et al. (2025)</span></a> established volatile fingerprints for fried pepper oils using the "Chinese Medicine Chromatographic Fingerprint Similarity Evaluation System" and adopted a similarity threshold of 0.900 for quality discrimination. Therefore, we characterized the volatile fingerprint of authentic traditional SO using headspace solid-phase microextraction (HS-SPME) coupled with two-dimensional GC (GC×GC)-MS; co-elution issues were resolved by parallel GC×GC-MS analysis, while fingerprint similarity was evaluated using the "Chinese Medicine Chromatographic Fingerprint Similarity Evaluation System" based on GC-MS data. By comparing this fingerprint with those of diluted SO by maize oil (MO) and sesame essence-adulterated oil, we investigated the accuracy of the fingerprint model. This study provides a scientific basis for quality control and authentication of traditional SO.</p><h4><strong>2. Materials and methods</strong></h4><h5><strong>2.4. GC×GC-MS</strong></h5><p>GC-MS (<a target="_blank" rel="noopener noreferrer" href="https://labrulez.com/en-us/gcms/library?mainauthorItems=10&amp;search=8890"><strong>8890</strong></a>–<a target="_blank" rel="noopener noreferrer" href="https://labrulez.com/en-us/gcms/library?mainauthorItems=10&amp;search=5977B"><strong>5977B</strong></a>, Agilent Technologies, Santa Clara, CA, USA) with a solid-state modulator (SSM) 1800 (J&amp;X Technologies, Shanghai, China) was used to qualitatively analyze the volatile compounds of SO (B. <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#bib17"><span>Wang et al., 2023</span></a>).</p><p>Volatile compounds were detected as previously described (<a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#bib2"><span>Duan et al., 2025</span></a>), with some modifications. Mass spectra were acquired over the range of 40–450 <i>m/z</i>. Ultra-purity helium (99.999% purity) served as the carrier gas, flowing at a rate of 1.2 mL/min. A splitless injection mode was used. The oven temperature program was set to 40 °C and held this temperature for 2 min, slowly increased to 230 °C at 4 °C per min, and held at 230 °C for 5 min. The detector temperature was set to 250 °C. The quadrupole temperature and transfer line temperature were 150 °C and 250 °C, respectively. An electron impact ion source with an electron energy of 70 eV was used. The ion source temperature was set to 230 °C. A full scan mode was applied for acquisition. Two columns were used inside the GC oven: the first was a polar column, DB-wax (30 m × 0.25 mm × 0.25 μm; Agilent Technologies); the second was a mid-polar column, DB−17 (mid-polar, 1.85 m × 0.18 mm × 0.18 μm; J&amp;X Technologies). SSM1800 was placed between them for the heating and cooling stages. The SSM modulation period was 4 s. GC×GC-MS was used solely for qualitative confirmation of compounds that co-eluted in GC-MS.</p><h5><strong>2.5. GC-MS</strong></h5><p>Volatile compounds were analyzed semi-quantitatively by GC-MS (<a target="_blank" rel="noopener noreferrer" href="https://labrulez.com/en-us/gcms/library?mainauthorItems=10&amp;search=7890A"><strong>7890A</strong></a>−<a target="_blank" rel="noopener noreferrer" href="https://labrulez.com/en-us/gcms/library?mainauthorItems=10&amp;search=7000B"><strong>7000B</strong></a>; Agilent Technologies), and 2-methyl−3-heptanone was used as an internal standard. GC-MS analysis was performed using a DB-wax column (polar, 30 m × 0.25 mm, 0.25 μm; Agilent Technologies, Folsom, CA, USA) to distinguish the volatile compounds. The carrier gas (ultra-pure helium, 99.999%) was delivered at a flow rate of 1.2 mL/min. The method, heating, and mass spectrometry conditions are consistent with those described in Section 2.4. All quantitative and fingerprint similarity analyses were based on the GC-MS data obtained from this section.</p><h4><strong>3. Results and discussion</strong></h4><h5><strong>3.2. Analysis of volatile compounds</strong></h5><p>The GC×GC-MS result of JH and the GC-MS results of JH, MSO 5 (50% MO), and MSE 3 (0.6% SOE) are shown in <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#fig0005"><span>Fig. 1</span></a>. A total of 85 volatile compounds were identified in the SO, MSO, and MSE samples, and 33 common peaks were identified, including ketone (1), acid (1), nitrogen-containing compounds (16), sulfur-containing compounds (7), furans (3), aldehyde (1), and phenolic compounds (4, <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#tbl0015"><span>Table 3</span></a>).</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Journal_of_Food_Composition_and_Analysis_2026_155_109277_Fig_1_A_and_B_respectively_represent_the_three_dimensional_chromatogram_and_two_dimensional_chromatogram_336c1e9b86.jpg" alt="Journal of Food Composition and Analysis, 2026, 155:109277: Fig. 1. (A) and (B) respectively represent the three-dimensional chromatogram and two-dimensional chromatogram of volatile compounds within the JH−1 sesame oil sample; (C)-(E) respectively represent the GC-MS results of volatile compounds within the JH−1, MSO 6 (50% MO), and MSE 3 (0.6% MSE)." srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Journal_of_Food_Composition_and_Analysis_2026_155_109277_Fig_1_A_and_B_respectively_represent_the_three_dimensional_chromatogram_and_two_dimensional_chromatogram_336c1e9b86.jpg 119w," sizes="100vw" width="1600" height="2107"></p><h5><strong>3.3. Establishment of GC-MS fingerprints and similarity analysis of volatile substances</strong></h5><p>The GC-MS volatile compound data from the test SO samples were imported into the Fingerprint Similarity System to generate chromatographic fingerprints. The reference fingerprint profile was constructed as the arithmetic mean of all profiles (<a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#fig0015"><span>Fig. 3</span></a>). Similarity values between the sample fingerprints and reference were calculated to evaluate compositional consistency. The SO samples showed a reference fingerprint similarity of 0.910–0.993 (<a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#tbl0020"><span>Table 4</span></a>), surpassing the 0.900 benchmark (<a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#bib10"><span>Ma et al., 2024</span></a>). This demonstrates a consistent composition of key volatile components across samples with minimal quality variation, satisfying the fundamental fingerprinting and quality assessment requirements for traditional SO.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Journal_of_Food_Composition_and_Analysis_2026_155_109277_Fig_3_Reference_fingerprint_of_volatile_compounds_b17f79ad1a.jpg" alt="Journal of Food Composition and Analysis, 2026, 155:109277: Fig. 3. Reference fingerprint of volatile compounds in traditional SO established by GC-MS. Different numbers are represented the different compounds in Table 2." srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Journal_of_Food_Composition_and_Analysis_2026_155_109277_Fig_3_Reference_fingerprint_of_volatile_compounds_b17f79ad1a.jpg 245w," sizes="100vw" width="1600" height="584"></p><h4><strong>4. Conclusion</strong></h4><p>This study established a volatile compound fingerprinting method using HS‑SPME‑GC‑MS with GC×GC‑MS‑assisted identification for the authentication of traditional sesame oil. A total of 33 common volatile peaks were identified, with pyrazines and guaiacol as major contributors. OPLS‑DA models (R²Y &gt; 0.98, Q² &gt; 0.97) demonstrated robust discrimination between authentic and adulterated oils, as well as between the two adulteration types. Compounds with VIP &gt; 1 and p &lt; 0.05 were identified as potential key markers. Selected key markers were then subjected to external standard quantification, and the obtained absolute concentrations were used to perform PCA. All calibration curves showed excellent linearity (R² &gt; 0.997), and the external standard PCA clearly separated sesame oil essence from all other samples. Fingerprint similarity analysis, validated by ROC (AUC = 1.000, optimal cutoff 0.8935), showed that adulterated samples had similarity values below 0.9, clearly distinguishing them from authentic oils. The method successfully detected maize oil dilution adulteration as low as 5% and sesame oil essence adulteration as low as 0.2%.</p><p>Compared with previous methods (<a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#bib1"><span>Aghili et al., 2023</span></a>; <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#bib18"><span>Wang et al., 2024a</span></a>; <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#bib20"><span>Xing et al., 2019</span></a>; <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0889157526004205#bib26"><span>Zhang et al., 2016</span></a>), our approach uniquely detects both dilution and essence adulteration in a single workflow, achieves lower detection limits (5% for MO, 0.2% for SOE), and provides an intuitive 0.900 similarity threshold without complex chemometric modeling. While non‑destructive methods (e‑nose, IMS) are more suitable for rapid screening, our approach offers higher chemical specificity, the ability to distinguish between dilution and essence adulteration, and an intuitive similarity threshold. Current limitations include testing only maize oil and one essence type, and validation on laboratory‑prepared samples. Future work will expand to other adulterants (soybean, rapeseed oil) and blind commercial samples. Overall, this method provides a reproducible, empirically validated tool for traditional sesame oil authentication. Furthermore, external standard quantification in the present study was performed only for a selected set of key volatile markers (VIP&nbsp;&gt;&nbsp;1 and p&nbsp;&lt;&nbsp;0.05). The same approach can be extended to other compounds in future studies, enabling odor activity value (OAV) calculations for deeper insights into sensory contributions, more precise adulteration level prediction, and improved model robustness across different production batches.</p></div></div></div></div></div>

Volatile compound fingerprinting for traditional sesame oil authentication using GC-MS with GC×GC-MS-assisted identification

Comprehensive investigation of matrix effect evaluation approaches for reliable quantification in bioanalysis using UHPLC-MS/MS

<p><span><strong>This study compares loss-on-ignition, acid decarbonation, and combustion elemental analysis for measuring organic carbon in sediments using certified reference materials and real samples. Loss-on-ignition conversions were inaccurate, while acid washing before elemental analysis caused significant organic carbon loss and poor precision.</strong></span></p><p><span>Combustion pretreatment followed by elemental analysis provided accurate and precise organic and inorganic carbon measurements, confirmed by temperature-dependent combustion. Across more than 150 intertidal sediment samples, acid decarbonation underestimated organic carbon by 37% ± 8%, supporting combustion-based elemental analysis as the preferred approach for reliable sediment carbon determination.</span></p><blockquote><h4><strong>The original article</strong></h4><h4><a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#s0055"><strong>Comparing loss-on-ignition, acid decarbonation and combustion elemental analysis for measuring organic carbon concentrations – recommendations for best practice</strong></a></h4><p>Robert B. Sparkes, Stuart A. Rae, Lucy McMahon, Hannah L. Mossman, David McKendry, Clare E. Dean, Graham Tinsley, Frances Fowden, Connor J. Grisdale, Hafiza Begum, Holly Hope, Charlotte McEnhill, Samuel O’Boyle, Nawal Sohail, Marvyn Wachira, Rachel M. Dunk</p><p>Organic Geochemistry, Volume 218, 2026, 105215</p><div><a target="_blank" rel="noopener noreferrer" href="https://doi.org/10.1016/j.orggeochem.2026.105215"><span>10.1016/j.orggeochem.2026.105215</span></a></div><h6>licensed under <a target="_blank" rel="noopener noreferrer" href="https://creativecommons.org/licenses/by/4.0/"><strong>CC-BY 4.0</strong></a></h6></blockquote><p><strong>Selected sections from the article follow. Formats and hyperlinks were adapted from the original.</strong></p><div><div><div><div><div><p>Environmental and Earth scientists frequently require measurements of carbon contents, including both the total carbon concentration (TC) and the fractions contributed by carbon from organic matter (organic carbon; OC) and carbonate minerals (inorganic carbon; IC; <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#b0025"><span>Bendle et al., 2009</span></a>, <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#b0220"><span>Radabaugh et al., 2018</span></a>, <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#b0230"><span>Saderne et al., 2019</span></a>, <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#b0240"><span>Scheingross et al., 2019</span></a>, <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#b0260"><span>Smeaton et al., 2021</span></a>, <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#b0295"><span>Vonk et al., 2012</span></a>, <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#b0315"><span>Wood et al., 2021</span></a>).</p><p>Accurate, precise, and affordable carbon concentration measurements are critical to the drive towards net-zero emissions, which requires monitoring, reporting and verification of carbon burial and release from an array of global environments (<a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#b0210"><span>Post et al., 2001</span></a>, <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#b0265"><span>Smith, 2004</span></a>, <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#b0270"><span>Smith et al., 2020</span></a>). Carbon concentration measurements also underpin further analyses (e.g. normalising the concentration of individual biomarker compounds against the total organic carbon concentration, calculating elemental carbon to nitrogen ratios (<a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#b0290"><span>van Dongen et al., 2008</span></a>), determining the correct sample load for isotope ratio measurements). Despite carbon concentration measurements being ubiquitous throughout multiple disciplines there is no standard approach for making these, especially determining the organic component of the sedimentary carbon (<a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#b0080"><span>Fest et al., 2022</span></a>, <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#b0320"><span>Young et al., 2018</span></a>). Different disciplines have often generated their own consensus approach, which may not align with studies from another field, even those working on similar samples and asking similar questions (<a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#b0070"><span>Farmer et al., 2014</span></a>). Use of an agreed standard measurement protocol for carbon concentrations, or understanding the agreement/variability between protocols, is vital for regulatory monitoring, reporting and verification (MRV), such as the ongoing development of carbon offsetting standards that, if implemented robustly, could provide real-world benefits to climate mitigation (<a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#b0035"><span>Bonn et al., 2014</span></a>, <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#b0045"><span>Burden et al., 2023</span></a>, <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#b0105"><span>Guizar-Coutiño et al., 2022</span></a>, <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#b0190"><span>Needelman et al., 2018</span></a>, <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#b0205"><span>Pan et al., 2022</span></a>). Determining a standardised, verified approach to carbon measurement is important for those performing MRV, who may not have access to advanced and/or expensive analytical instrumentation.</p><p>This study compares three common methods for quantifying the total and organic carbon concentrations in sedimentary samples: i) loss-on-ignition, ii) elemental analysis combined with acid decarbonation, and iii) elemental analysis combined with organic matter combustion. The comparison focuses on assessing the accuracy, precision, and repeatability of each method, identifying their respective strengths and weaknesses, and independently confirming findings via a fourth method (temperature dependent combustion and infrared CO<sub>2</sub> measurement) to provide recommendations for best practice. A summary review of these methods is provided below.</p><h4><strong>2. Materials and methods</strong></h4><h5><strong>2.3. Independent testing of reference materials via TDC</strong></h5><p>Standards were analysed by the supplier (Elemental Microanalysis Ltd, UK) as part of the certification process: 15/30 elemental analysis measurements gave expected values of TC, OC and IC and the uncertainty for TC, following ISO/IEC17025. These values were independently checked using an <a target="_blank" rel="noopener noreferrer" href="https://labrulez.com/en-us/icpms/library?mainauthorItems=16&amp;search=Soli+TOC"><strong>Elementar SoliTOC cube</strong></a> instrument at the instrument manufacturer’s headquarters (Elementar Analysensysteme, Hanau, Germany), which used the TDC method. Two combustion ramps were applied, first a two-step OC and IC determination at 500 °C and 900 °C, and then a three-step programme at 400 °C and 600 °C for easily-combustible and residual OC fractions and 900 °C for IC, with three repeat measurements of each. The SoliTOC cube instrument also analysed the agricultural soil sample, again making three repeat measurements of both the two-step and three-step temperature dependent combustion protocols (see Supplementary Table 3).</p><h5><strong>2.5. Elemental analysis</strong></h5><p>Total carbon concentrations were measured following the protocol described in <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#b0180"><span>Mossman et al. (2022)</span></a>. 20&nbsp;mg of either untreated or pre-treated sample was weighed into tin capsules (Elemental Microanalysis Ltd.) and analysed for carbon concentrations using a Vario EL cube elemental analyser (Elementar Ltd.). Before each analytical run, the instrument was cleaned using three blanks without oxygen and seven blanks with oxygen, and calibrated using five analyses of up to 14&nbsp;mg ethylenediaminetetraacetic acid (EDTA) standard (Elemental Microanalysis Ltd.) and three analyses of an independent Soil Standard (Clay) CRM, acquired separately to the Soil Standard (Clay) CRM used to create analytical samples for this study (Elemental Microanalysis Ltd.). Three analyses of the EDTA calibration standard were repeated after every twenty samples. Long-term drift was monitored by repeated measurements of an internal laboratory standard sample, which has been analysed since 2015. Over the course of 65 measurements across 10 instrument runs for this study the laboratory standard showed no systematic drift.</p><h4><strong>3. Results and discussion</strong></h4><h5><strong>3.1. Testing of certified reference materials (CRMs) using temperature dependent combustion (TDC)</strong></h5><p>Both two-step and three-step TDC protocols consistently measured carbon contents close to but slightly below the supplier-certified values (see <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#f0005"><span>Fig. 1</span></a>). For Soil Standard (Clay), the TDC instrument under-estimated OC by 0.10&nbsp;wt% (two-step) and 0.14&nbsp;wt% (three-step) and IC by 0.15&nbsp;wt% (two-step) and 0.087&nbsp;wt% (three-step). For Soil Standard (Peaty) the TDC instrument underestimated OC by 0.26&nbsp;wt% (two-step) and 0.34&nbsp;wt% (three-step), and IC by 0.021&nbsp;wt% (two-step) and 0.090&nbsp;wt% (three-step). Relative differences for OC are small, 5.1 – 7.0% for Clay and just 1.7 – 2.2% for Peaty, but higher for IC due to the small amount of IC present in the standards (25 – 44% for Clay, 7.0 – 30% for Peaty).</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Organic_Geochemistry_Volume_218_2026_105215_Fig_1_Comparison_of_organic_carbon_and_inorganic_carbon_measurements_on_two_certified_reference_materials_using_four_methods_31537717b3.jpg" alt="Organic Geochemistry, Volume 218, 2026, 105215: Fig. 1. Comparison of organic carbon and inorganic carbon measurements on two certified reference materials using four methods. Upper panel is Soil Standard (Clay) and lower panel Soil Standard (Peaty). Yellow diamonds show the certified value (Elemental Microanalysis Ltd) with manufacturer stated uncertainty in total carbon used as error bars for OC and IC (n = 30). White and grey symbols represent Loss-on-Ignition results using four different organic matter to organic carbon conversion equations (grey sqaures use the “van Bemmelen” scaling factor (Pribyl, 2010), grey circles the Craft et al. (1991) factor, white diamonds the Ouyang and Lee (2020) equation and white circles the Smeaton et al. (2022) equation. IC values for all LoI results use the C/CO2 mass fraction (Wang et al., 2011). Blue circles show the acid decarbonation and elemental analysis protocol, orange circles the combustion and elemental analysis protocol. Green and purple circles show mean results from temperature dependent combustion method (2-step and 3-step protocols respectively). Error bars represent one standard deviation after multiple measurements (n = 2 to n = 4). (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Organic_Geochemistry_Volume_218_2026_105215_Fig_1_Comparison_of_organic_carbon_and_inorganic_carbon_measurements_on_two_certified_reference_materials_using_four_methods_31537717b3.jpg 116w," sizes="100vw" width="2756" height="3698"></p><h5><strong>3.4. Reproducibility tests</strong></h5><p>Having shown that combustion coupled with elemental analysis was the most robust method for measuring OC in pure and diluted standards, the next experiment tested the reproducibility of these protocols over multiple implementations. A dried, ground agricultural soil sample was repeatedly analysed using each method (separate aliquots were measured using LoI at 500 °C and 800 °C, separate untreated aliquots were analysed via EA, separate aliquots were combusted at 500 °C and analysed via EA, and separate acid decarbonations were carried out prior to EA measurements). This required a large amount of starting material, more than was available in the CRMs. Independent external measurement of the soil sample using temperature dependent combustion (Elementar, Germany) gave mean OC&nbsp;=&nbsp;2.50&nbsp;±&nbsp;0.002&nbsp;wt% and IC&nbsp;=&nbsp;1.29&nbsp;±&nbsp;0.008&nbsp;wt% for combustion to 500 °C (n&nbsp;=&nbsp;3), whereas combustion to 600 °C gave OC&nbsp;=&nbsp;2.52&nbsp;±&nbsp;0.075 and IC&nbsp;=&nbsp;1.12&nbsp;±&nbsp;0.010&nbsp;wt% (n&nbsp;=&nbsp;3).</p><div><p>LoI showed differences in mean OC depending on the equation chosen (<a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#f0010"><span>Fig. 2</span></a>). The conversions of <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#b0050"><span>Craft et al. (1991)</span></a> and <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#b0200"><span>Ouyang and Lee (2020)</span></a> were similar to the independent measurements (2.90&nbsp;±&nbsp;0.05&nbsp;wt% and 2.60&nbsp;±&nbsp;0.07&nbsp;wt% respectively; n&nbsp;=&nbsp;9 for each), but the equations of <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#b0255"><span>Smeaton et al. (2022)</span></a> and van Bemmelen over-estimated OC (4.19&nbsp;±&nbsp;0.05 and 4.21&nbsp;±&nbsp;0.08&nbsp;wt% respectively; n&nbsp;=&nbsp;9 for each). IC estimates using the C/CO<sub>2</sub> mass fraction conversion were higher than the expected value (1.91&nbsp;±&nbsp;0.06&nbsp;wt%, n&nbsp;=&nbsp;9). Note that the relative standard deviation for OC<sub>LoI</sub> was&nbsp;∼&nbsp;1.8%, and 3.2% for IC<sub>LoI</sub>, showing acceptable run-to-run precision.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Organic_Geochemistry_Volume_218_2026_105215_Fig_2_Organic_and_inorganic_carbon_measurements_following_repeated_analysis_of_a_homogenised_soil_sample_via_multiple_methods_c5d62ece0b.jpg" alt="Organic Geochemistry, Volume 218, 2026, 105215: Fig. 2. Organic and inorganic carbon measurements following repeated analysis of a homogenised soil sample via multiple methods. Markers for each method are shown in the legend and are the same as Fig. 1. Small black circles and error bars show the mean and one standard deviation after multiple repetitions of each protocol (n = 9 for LoI, C-EA and AD-EA, n = 3 for TDC)." srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Organic_Geochemistry_Volume_218_2026_105215_Fig_2_Organic_and_inorganic_carbon_measurements_following_repeated_analysis_of_a_homogenised_soil_sample_via_multiple_methods_c5d62ece0b.jpg 204w," sizes="100vw" width="2363" height="1815"></p><p>Since OC<sub>C-EA</sub> and IC<sub>AD-EA</sub> were calculated by subtraction from mean TC<sub>EA</sub>, all data from the C-EA and AD-EA methods plotted on a straight line in <a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0146638026000902#f0010"><span>Fig. 2</span></a>, representing OC&nbsp;+&nbsp;IC&nbsp;=&nbsp;TC. However, position and scatter along that line varied between the two pre-treatment techniques. OC<sub>C-EA</sub> clustered just higher than the independent measurements using TDC (2.60&nbsp;±&nbsp;0.03&nbsp;wt%, n&nbsp;=&nbsp;9). Propagating the errors in TC and IC gave a combined error estimate of&nbsp;±&nbsp;0.1&nbsp;wt% for the repeated OC<sub>C-EA</sub> measurements. IC<sub>C-EA</sub> was also close to but slightly higher than the TCD results, 1.35&nbsp;±&nbsp;0.03&nbsp;wt%. AD-EA, however, gave mean OC values of 2.00&nbsp;±&nbsp;0.12&nbsp;wt% (n&nbsp;=&nbsp;9) which was more variable run-to-run than the other methods and gave a significantly (p&nbsp;&lt;&nbsp;0.0001) lower mean OC value than the TCD results. Once again, acid decarbonation results suggested that a large amount of organic matter was lost during the acid treatment, tested further in the next section.</p></div><h4><strong>4.3. Conclusions</strong></h4><p>An accurate, precise, efficient, and standardised method for measuring total, organic and inorganic carbon contents of sediment samples is critical for both scientific research and environmental monitoring and reporting and verification. We rigorously tested three methods for measuring carbon contents in soils and intertidal sediments, using certified reference materials and&nbsp;&gt;&nbsp;150 sediment samples. Loss-on-ignition (LoI) is cheap and easy but showed moderate run-to-run variability and, without careful calibration, it is not accurate.</p><p>Elemental analysis (EA) is an accurate and precise method for total carbon (TC) analysis. Measuring organic and inorganic carbon via EA requires pre-treatment of the sample, and this study tested both acid decarbonation and combustion preparation techniques. Acid decarbonation led to significant and variable organic carbon loss, meaning that true organic carbon concentrations are likely higher than those measured following acidification. Combustion pre-treatment was shown to efficiently remove organic matter, leading to accurate and precise results, and we would recommend making organic carbon measurements in this way.</p></div></div></div></div></div>

Comparing loss-on-ignition, acid decarbonation and combustion elemental analysis for measuring organic carbon concentrations – recommendations for best practice

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Phenomenex Luna Omega C18 HPLC Columns

Luna Omega C18 is an excellent first choice for chromatographers who are just starting method development or attempting to improve upon existing chromatographic results with other C18s.

<p><strong>First Choice C18 for Hydrophobic Selectivity</strong></p><p><strong>Luna Omega C18</strong> is an excellent first choice for chromatographers who are just starting method development or attempting to improve upon existing chromatographic results with other C18s. With its higher performance potential, excellent retention profile, and greater inertness, the Luna Omega C18 was designed to be the new all purpose UHPLC solution for industries all over the world.</p><ul><li>Compatible with All Analytical HPLC/UHPLC Systems</li><li>Fully Scalable Particle Size UHPLC HPLC Preparative</li><li>Highest Reproducibility and Batch-to-batch Confidence</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Phenomenex_Luna_Omega_C18_HPLC_Column_4846f08b6d.jpg" alt="Phenomenex: Luna Omega C18 HPLC Column" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Phenomenex_Luna_Omega_C18_HPLC_Column_4846f08b6d.jpg 245w," sizes="100vw" width="841" height="308"></p><ul><li><strong>Carbon Load</strong>: null %, 11.0 %</li><li><strong>Surface Area (m²/g)</strong>: 800</li><li><strong>Particle Size</strong>: 1.6, 3, 5</li><li><strong>Recommended Use:</strong> Reproducible C18 phase for HPLC and UHPLC separations of hydrophobic compounds</li></ul><h4><strong>Greater Retention and Better Results</strong></h4><p>Higher efficiency levels in combination with excellent stationary phase coverage and greater particle inert ness, translates to improved separation power for you. Now you can utilize the greater retention of Luna Omega C18 to tackle both easy and difficult separations.</p><h4><strong>Consistent and Reliable C18 Results</strong></h4><p>Batch-to-batch and column-to-column, Luna Omega media and columns are designed to be consistent and incredibly accurate tools for your analysis. Each batch and column are quality tested to ensure dependability and reproducibility.</p><h4><strong>All Purpose HPLC and UHPLC Selectivity</strong></h4><p>Strong and focused hydrophobic retention, incredible efficiency and valuable inertness of Luna Omega C18 columns make them an excellent choice for small mixtures of compounds differing in hydrophobicity as well as large mixtures of compounds like drug impurity and degradation profiles and natural products.</p><h4><strong>Higher Efficiency Compared to Other Fully Porous Particles</strong></h4><p>Luna Omega 1.6 µm, 3 µm, and 5 µm particle columns provide higher efficiencies compared to other silica C18 columns with fully porous particles of the same size due to the absence of micropores within the particles.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Phenomenex_Luna_Omega_C18_vs_Waters_ACQUITY_BEH_C18_45acf914af.jpg" alt="Phenomenex: Luna Omega C18 vs Waters ACQUITY BEH C18" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Phenomenex_Luna_Omega_C18_vs_Waters_ACQUITY_BEH_C18_45acf914af.jpg 196w," sizes="100vw" width="900" height="718"></p><blockquote><p class="cke-user_style-important"><strong>Stationary phase Luna Omega C18 is provided in these column types: microbore and minibore</strong></p></blockquote><h5><strong>Luna Omega C18 HPLC Microbore and Minibore Columns are available with these parameters:</strong></h5><p><strong>Microbore Columns</strong></p><ul><li><strong>Column length (mm): </strong>50, 100, 150</li><li><strong>Column ID (mm): </strong>1</li><li><strong>Particle size (µm): </strong>1.6</li></ul><p><strong>Minibore Columns</strong></p><ul><li><strong>Column length (mm): </strong>30,<strong> </strong>50, 100, 150</li><li><strong>Column ID (mm): </strong>2.1</li><li><strong>Particle size (µm): </strong>1.6</li></ul><h3><strong>Phenomenex Luna Omega HPLC/UHPLC Columns</strong></h3><p>The cutting edge thermally modified Luna Omega particle delivers high efficiency, ruggedness, reproducibility, and dependability for a wide range of chromatographic analyses. Luna Omega HPLC and UHPLC columns are built upon more then 20 years of applied knowledge, invention, and customer experience in the manufacture and packing of LC columns. The particle’s novel design and proprietary manufacturing process results in greater particle inertness, a stronger particle morphology, and more consistent porosity.</p><ul><li>Greater separation muscle and retention</li><li>Consistent porous structure and elimination of micropores</li><li>Extreme ruggedness and reproducibility</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Phenomenex_Thermal_modified_pore_structure_of_Luna_Omega_Column_particles_37138bb135.jpg" alt="Phenomenex:Thermal modified pore structure of Luna Omega Column particles" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Phenomenex_Thermal_modified_pore_structure_of_Luna_Omega_Column_particles_37138bb135.jpg 245w," sizes="100vw" width="1257" height="369"></p><h3><strong>Explore Luna Omega Columns</strong></h3><h5><strong>Astounding Performance</strong></h5><p>The undeniably high efficiency levels found in each Luna Omega UHPLC column provide you with the potential of huge gains in method performance. While traditional silica and hybrid fully porous particles claim high performance, when compared to Luna Omega 1.6 μm, they drastically fall short and prevent UHPLC scientists from reaching their UHPLC potential.</p><h5><strong>Separation Muscle</strong></h5><p>Our industry leading bonding technologies in conjunction with high efficiency levels ensure excellent stationary phase coverage and improved separation power. Now, with Luna Omega 1.6 μm, you can turn difficult separations into resolution achievements.</p><h5><strong>Inert Foundation</strong></h5><p>Luna Omega UHPLC columns contain a unique silica modified using a proprietary, post-synthetic thermal treatment process to provide extraordinary mechanical strength and significantly greater inertness than traditional fully porous and hybrid materials. This greatly minimizes secondary interactions that negatively affect peak shape, allowing for greater method accuracy.</p><h5><strong>Consistent Results</strong></h5><p>Batch-to-batch and column-to-column, Luna® Omega media and columns are designed to be consistent and incredibly accurate tools for your analysis. Each batch and column are quality tested to ensure dependability and reproducibility.</p>

Phenomenex Luna Omega Polar C18 HPLC Columns

Luna Omega Polar C18 is a novel HPLC and UHPLC stationary phase capable of providing a unique selectivity within a wide elution window and increased retention for both polar and non polar analytes.

<p><strong>Reversed Phase Polar Retention Without the Headache</strong></p><p><strong>Luna Omega Polar C18</strong> is a novel HPLC and UHPLC stationary phase capable of providing a unique selectivity within a wide elution window and increased retention for both<strong> polar</strong> and <strong>non polar analytes</strong>. The all purpose C18 ligand provides <strong>hydrophobic interactions</strong> while a polar modified particle surface provides enhanced <strong>polar retention</strong> and also<strong> aqueous stability</strong>. These attributes make the Luna Omega Polar C18an excellent choice for balanced retention of polar and hydrophobic compounds as well as to solely enhance retention of highly polar compounds.</p><ul><li>Compatible with All Analytical HPLC/UHPLC Systems</li><li>Fully Scalable Particle Size UHPLC HPLC Preparative</li><li>100 % Aqueous Stable C18 Selectivity</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Phenomenex_Luna_Omega_Polar_C18_HPLC_Column_a9c42ff59a.jpg" alt="Phenomenex: Luna Omega Polar C18 HPLC Column" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Phenomenex_Luna_Omega_Polar_C18_HPLC_Column_a9c42ff59a.jpg 245w," sizes="100vw" width="870" height="315"></p><ul><li><strong>Carbon Load</strong>: null %, 11.0 %</li><li><strong>Particle Size</strong>: 1.6, 3, 5</li><li><strong>Recommended Use:</strong> Polar retentive C18 phase for HPLC and UHPLC separations of hydrophobic/polar compounds</li></ul><h4><strong>Not Just Another C18…Built Different</strong></h4><p>Luna Omega Polar C18 is a uniquely modified C18 based chemistry that has been optimized to improve the performance of polar analyses. This new particle surface chemistry makes the Polar C18 applicable to all industries that utilize HPLC for mixtures of polar and non polar compounds.</p><h4><strong>Stable Retention &amp; 100% Aqueous Stable&nbsp;</strong></h4><p>Traditional C18 phases are known to collapse under 100 % aqueous conditions, causing retention loss of compounds and a method development headaches. That is why an advanced proprietary bonding technology was used for the Luna Omega Polar C18 in order to ensure aqueous stability.&nbsp;</p><h4><strong>Increased Reversed Phase Polar Retention</strong></h4><p>With its polar modified surface, the Luna Omega Polar C18 offers UHPLC users enhanced separation power that can greatly improve resolution values for target compounds.</p><blockquote><p class="cke-user_style-important"><strong>Stationary phase Luna Omega Polar C18 is provided in these column types: analytical, microbore, minibore, midbore and preparative</strong></p></blockquote><h5><strong>Luna Omega Polar C18 HPLC Microbore, Minibore, MidBore and Analytical Columns are available with these parameters:</strong></h5><p><strong>Microbore Columns</strong></p><ul><li><strong>Column length (mm): </strong>50, 100, 150</li><li><strong>Column ID (mm): </strong>1</li><li><strong>Particle size (µm): </strong>1.6</li></ul><p><strong>Minibore Columns</strong></p><ul><li><strong>Column length (mm): </strong>30,<strong> </strong>50, 100, 150</li><li><strong>Column ID (mm): </strong>2.1</li><li><strong>Particle size (µm): </strong>1.6; 3, 5</li></ul><p><strong>MidBore Columns</strong></p><ul><li><strong>Column length (mm): </strong>50, 100, 150</li><li><strong>Column ID (mm): </strong>3</li><li><strong>Particle size (µm):</strong> 3, 5</li></ul><p><strong>Analytical Columns</strong></p><ul><li><strong>Column length (mm): </strong>50, 100, 150, 250</li><li><strong>Column ID (mm): </strong>4.6</li><li><strong>Particle size (µm):</strong> 3, 5</li></ul><h3><strong>Phenomenex Luna Omega HPLC/UHPLC Columns</strong></h3><p>The cutting edge thermally modified Luna Omega particle delivers high efficiency, ruggedness, reproducibility, and dependability for a wide range of chromatographic analyses. Luna Omega HPLC and UHPLC columns are built upon more then 20 years of applied knowledge, invention, and customer experience in the manufacture and packing of LC columns. The particle’s novel design and proprietary manufacturing process results in greater particle inertness, a stronger particle morphology, and more consistent porosity.</p><ul><li>Greater separation muscle and retention</li><li>Consistent porous structure and elimination of micropores</li><li>Extreme ruggedness and reproducibility</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Phenomenex_Thermal_modified_pore_structure_of_Luna_Omega_Column_particles_37138bb135.jpg" alt="Phenomenex:Thermal modified pore structure of Luna Omega Column particles" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Phenomenex_Thermal_modified_pore_structure_of_Luna_Omega_Column_particles_37138bb135.jpg 245w," sizes="100vw" width="1257" height="369"></p><h3><strong>Explore Luna Omega Columns</strong></h3><h5><strong>Astounding Performance</strong></h5><p>The undeniably high efficiency levels found in each Luna Omega UHPLC column provide you with the potential of huge gains in method performance. While traditional silica and hybrid fully porous particles claim high performance, when compared to Luna Omega 1.6 μm, they drastically fall short and prevent UHPLC scientists from reaching their UHPLC potential.</p><h5><strong>Separation Muscle</strong></h5><p>Our industry leading bonding technologies in conjunction with high efficiency levels ensure excellent stationary phase coverage and improved separation power. Now, with Luna Omega 1.6 μm, you can turn difficult separations into resolution achievements.</p><h5><strong>Inert Foundation</strong></h5><p>Luna Omega UHPLC columns contain a unique silica modified using a proprietary, post-synthetic thermal treatment process to provide extraordinary mechanical strength and significantly greater inertness than traditional fully porous and hybrid materials. This greatly minimizes secondary interactions that negatively affect peak shape, allowing for greater method accuracy.</p><h5><strong>Consistent Results</strong></h5><p>Batch-to-batch and column-to-column, Luna® Omega media and columns are designed to be consistent and incredibly accurate tools for your analysis. Each batch and column are quality tested to ensure dependability and reproducibility.</p>

Phenomenex Luna Omega PS C18 HPLC Columns

Luna Omega PS C18 is a unique mixed interaction stationary phase that provides incredibly useful polar and non-polar retention. 

<p><strong>Improve Peak Shape for Bases Without the Headache</strong></p><p><strong>Luna Omega PS C18</strong> is a unique mixed interaction stationary phase that provides incredibly useful <strong>polar</strong> and <strong>non-polar retention</strong>. The surface of the PS C18 contains a positive charge which aids in the retention of acidic compounds and provides better peak shape for bases through ionic interactions, while the C18 ligand promotes general reversed phase retention. This mixed-mode selectivity allows for greater separation between compounds with varying functional groups.</p><ul><li>Compatible with All Analytical HPLC/UHPLC Systems</li><li>Fully Scalable Particle Size UHPLC HPLC Preparative</li><li>Charged Surface C18 that is 100 % Aqueous Stable</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Phenomenex_Luna_Omega_PS_C18_HPLC_Column_bf5cf29276.webp" alt="Phenomenex: Luna Omega PS C18 HPLC Column" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Phenomenex_Luna_Omega_PS_C18_HPLC_Column_bf5cf29276.webp 245w," sizes="100vw" width="500" height="150"></p><ul><li><strong>Carbon Load</strong>: null %, 11.0 %</li><li><strong>Particle Size</strong>: 1.6, 3, 5</li><li><strong>Recommended Use:</strong> Positive surface C18 phase for HPLC and UHPLC separations of hydrophobic/basic compounds</li></ul><h4><strong>A C18 With a Positive Twist</strong></h4><p>Luna Omega PS C18 has been fine tuned and manufactured by Phenomenex to provide a mixed selectivity that is highly useful for method development involving either combinations of polar and nonpolar compounds, or just one single compound class with small changes in functional groups.</p><h4><strong>Enhanced Selectivity and Polar Retention</strong></h4><p>With its positive surface (PS) the Luna Omega PS C18 provides valuable increase in retention of acids through ionic/polar interactions. In addition, the C18 ligand also stimulates hydrophobic retention that greatly promotes increased resolution between analytes of interest.</p><h4><strong>Think Outside the Traditional C18 Selectivity</strong></h4><p>Traditional C18 phases may not always be the best option. A HPLC and UHPLC column that has both polar and hydrophobic versatility allows for great method development flexibility.</p><h4><strong>Better Peak Shape for Bases</strong></h4><p>While traditional alkyl phases are prone to show tailing for basic compounds because of secondary interactions occurring at the silica surface, the surface of the Luna Omega PS C18 was designed with positive charges that serve to repel strong basic species and consistently display sharp peak shape.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Phenomenex_Better_Peak_Shape_for_Bases_Comparison_of_Luna_Omega_PS_C18_with_C18_Columns_from_other_manufacturers_3667109291.jpg" alt="Phenomenex: Better Peak Shape for Bases (Comparison of Luna Omega PS C18 with C18 Columns from other manufacturers)" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Phenomenex_Better_Peak_Shape_for_Bases_Comparison_of_Luna_Omega_PS_C18_with_C18_Columns_from_other_manufacturers_3667109291.jpg 245w," sizes="100vw" width="905" height="485"></p><blockquote><p class="cke-user_style-important"><strong>Stationary phase Luna Omega PS C18 is provided in these column types: analytical, minibore, midbore and preparative</strong></p></blockquote><h5><strong>Luna Omega PS C18 HPLC Minibore, MidBore and Analytical Columns are available with these parameters:</strong></h5><p><strong>Minibore Columns</strong></p><ul><li><strong>Column length (mm): </strong>30,<strong> </strong>50, 100, 150</li><li><strong>Column ID (mm): </strong>2.1</li><li><strong>Particle size (µm): </strong>1.6; 3, 5</li></ul><p><strong>MidBore Columns</strong></p><ul><li><strong>Column length (mm): </strong>50, 100, 150</li><li><strong>Column ID (mm): </strong>3</li><li><strong>Particle size (µm):</strong> 3, 5</li></ul><p><strong>Analytical Columns</strong></p><ul><li><strong>Column length (mm): </strong>50, 100, 150, 250</li><li><strong>Column ID (mm): </strong>4.6</li><li><strong>Particle size (µm):</strong> 3, 5</li></ul><h3><strong>Phenomenex Luna Omega HPLC/UHPLC Columns</strong></h3><p>The cutting edge thermally modified Luna Omega particle delivers high efficiency, ruggedness, reproducibility, and dependability for a wide range of chromatographic analyses. Luna Omega HPLC and UHPLC columns are built upon more then 20 years of applied knowledge, invention, and customer experience in the manufacture and packing of LC columns. The particle’s novel design and proprietary manufacturing process results in greater particle inertness, a stronger particle morphology, and more consistent porosity.</p><ul><li>Greater separation muscle and retention</li><li>Consistent porous structure and elimination of micropores</li><li>Extreme ruggedness and reproducibility</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Phenomenex_Thermal_modified_pore_structure_of_Luna_Omega_Column_particles_37138bb135.jpg" alt="Phenomenex:Thermal modified pore structure of Luna Omega Column particles" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Phenomenex_Thermal_modified_pore_structure_of_Luna_Omega_Column_particles_37138bb135.jpg 245w," sizes="100vw" width="1257" height="369"></p><h3><strong>Explore Luna Omega Columns</strong></h3><h5><strong>Astounding Performance</strong></h5><p>The undeniably high efficiency levels found in each Luna Omega UHPLC column provide you with the potential of huge gains in method performance. While traditional silica and hybrid fully porous particles claim high performance, when compared to Luna Omega 1.6 μm, they drastically fall short and prevent UHPLC scientists from reaching their UHPLC potential.</p><h5><strong>Separation Muscle</strong></h5><p>Our industry leading bonding technologies in conjunction with high efficiency levels ensure excellent stationary phase coverage and improved separation power. Now, with Luna Omega 1.6 μm, you can turn difficult separations into resolution achievements.</p><h5><strong>Inert Foundation</strong></h5><p>Luna Omega UHPLC columns contain a unique silica modified using a proprietary, post-synthetic thermal treatment process to provide extraordinary mechanical strength and significantly greater inertness than traditional fully porous and hybrid materials. This greatly minimizes secondary interactions that negatively affect peak shape, allowing for greater method accuracy.</p><h5><strong>Consistent Results</strong></h5><p>Batch-to-batch and column-to-column, Luna® Omega media and columns are designed to be consistent and incredibly accurate tools for your analysis. Each batch and column are quality tested to ensure dependability and reproducibility.</p>

Phenomenex Peptide-PS-C18 LC columns

Biozen Peptide PS-C18 is a mixed-mode phase that combines a positively charged surface ligand and a C18 ligand.

<p><strong>Biozen Peptide PS-C18</strong> is a mixed-mode phase that combines a <strong>positively charged surface ligand</strong> and a <strong>C18 ligand</strong>. The result is an HPLC column phase that provides excellent retention for <strong>biologics.</strong></p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Phenomenex_Biozen_Peptide_PS_C18_HPLC_Column_e114259469.webp" alt="Phenomenex: Biozen Peptide-PS-C18 HPLC Column" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Phenomenex_Biozen_Peptide_PS_C18_HPLC_Column_e114259469.webp 245w," sizes="100vw" width="500" height="150"></p><ul><li><strong>Separation Mode:</strong> Reversed Phase</li><li><strong>Pore size: </strong>100</li><li><strong>Particle size: </strong>1.6, 3</li><li><strong>Recommended Use:</strong> Excellent retention of peptides for both peptide mapping and peptide quantitation applications</li></ul><h3><strong>Phenomenex Biozen Biologics LC Columns</strong></h3><p>With a new titanium <strong>BioTi™</strong> biocompatible <strong>hardware</strong> to minimize priming, <strong>four particle platforms</strong> for optimal versatility and <strong>nine particle chemistries</strong> to maximize selectivity and sensitivity, Biozen UHPLC/HPLC columns for <strong>protein analysis</strong> are seamlessly designed to bring peace of mind to your analysis of biologics through:</p><ul><li>Charge Variant Analysis</li><li>Aggregate Analysis</li><li>Peptide Mapping</li><li>Intact Mass Analysis</li><li>Intact and Subunit Analysis</li><li>Glycan Analysis</li><li>Peptide Quantitation</li><li>Drug Antibody Ratio (DAR)</li><li>Oligonucleotide Characterization</li></ul><h3><strong>Biocompatible Flow Path with BioTi™ Hardware</strong></h3><p>Keep your mind at ease knowing that we’ve minimized the need for priming with a new titanium infused biocompatible hardware and frit that doesn’t interfere with protein or peptide integrity!</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Phenomenex_Bio_Ti_Hardware_991fb53395.jpg" alt="Phenomenex: BioTi Hardware" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Phenomenex_Bio_Ti_Hardware_991fb53395.jpg 245w," sizes="100vw" width="1378" height="426"></p><h3><strong>4 Advanced Particle Platforms</strong></h3><p>All four of the Biozen particle platforms were individually designed and built by Phenomenex to take advantage of integral levels of performance, ruggedness, and reproducibility for protein characterization applications. Individually, each platform differs in the proprietary processing techniques used to control particle size and morphology.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Phenomenex_Advanced_Particle_Platforms_a0959aca03.jpg" alt="Phenomenex: Advanced Particle Platforms" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Phenomenex_Advanced_Particle_Platforms_a0959aca03.jpg 245w," sizes="100vw" width="1439" height="868"></p>

Phenomenex Biozen Peptide-XB-C18 LC columns

Biozen Peptide XB-C18 uses core-shell particles for fast elution, sharper peaks, better peak capacity, and higher sensitivity.

<p>Digested mAbs or ADCs typically include a large body of compounds which are crucial to understanding post translation modifications. So we designed our <strong>Biozen™ Peptide columns</strong> to offer highly useful and unique retention profiles. <strong>Biozen Peptide XB-C18</strong> allows for <strong>fast</strong> and <strong>effective elution windows</strong> by utilizing core-shell particles to gain sharper peaks, better peak capacities, and overall higher sensitivity.</p><p><strong>Biozen Peptide columns provide:</strong></p><ul><li>Unique retention profiles</li><li>Greater peak coverage</li><li>High efficiency on both HPLC and UHPLC</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Phenomenex_Bio_Zen_Peptide_XB_C18_cd462e9b72.jpg" alt="Phenomenex: BioZen Peptide-XB-C18" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Phenomenex_Bio_Zen_Peptide_XB_C18_cd462e9b72.jpg 245w," sizes="100vw" width="839" height="314"></p><ul><li><strong>Separation Mode:</strong> Reversed Phase</li><li><strong>Pore size: </strong>100</li><li><strong>Particle size: </strong>1.7, 2.6, 5</li><li><strong>Recommended Use:</strong> Overall retention of both acidic and basic peptides for both peptide mapping and peptide quantitation applications</li></ul><h3><strong>Phenomenex Biozen Biologics LC Columns</strong></h3><p>With a new titanium <strong>BioTi™</strong> biocompatible <strong>hardware</strong> to minimize priming, <strong>four particle platforms</strong> for optimal versatility and <strong>nine particle chemistries</strong> to maximize selectivity and sensitivity, Biozen UHPLC/HPLC columns for <strong>protein analysis</strong> are seamlessly designed to bring peace of mind to your analysis of biologics through:</p><ul><li>Charge Variant Analysis</li><li>Aggregate Analysis</li><li>Peptide Mapping</li><li>Intact Mass Analysis</li><li>Intact and Subunit Analysis</li><li>Glycan Analysis</li><li>Peptide Quantitation</li><li>Drug Antibody Ratio (DAR)</li><li>Oligonucleotide Characterization</li></ul><h3><strong>Biocompatible Flow Path with BioTi™ Hardware</strong></h3><p>Keep your mind at ease knowing that we’ve minimized the need for priming with a new titanium infused biocompatible hardware and frit that doesn’t interfere with protein or peptide integrity!</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Phenomenex_Bio_Ti_Hardware_991fb53395.jpg" alt="Phenomenex: BioTi Hardware" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Phenomenex_Bio_Ti_Hardware_991fb53395.jpg 245w," sizes="100vw" width="1378" height="426"></p><h3><strong>4 Advanced Particle Platforms</strong></h3><p>All four of the Biozen particle platforms were individually designed and built by Phenomenex to take advantage of integral levels of performance, ruggedness, and reproducibility for protein characterization applications. Individually, each platform differs in the proprietary processing techniques used to control particle size and morphology.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Phenomenex_Advanced_Particle_Platforms_a0959aca03.jpg" alt="Phenomenex: Advanced Particle Platforms" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Phenomenex_Advanced_Particle_Platforms_a0959aca03.jpg 245w," sizes="100vw" width="1439" height="868"></p>

Phenomenex Biozen Oligo LC columns

Biozen Oligo is an organo-silica, core-shell particle bonded with a C18 stationary phase. 

<p><strong>Advanced Oligonucleotide Analysis</strong></p><p><strong>Biozen Oligo</strong> is an organo-silica, core-shell particle bonded with a C18 stationary phase. This column offers a unique combination of Core-Shell performance gains such as speed, sensitivity and resolution plus the high pH ruggedness necessary for <strong>oligonucleotide separations</strong>. Additionally, Biozen Oligo is packaged in <strong>BioTi™</strong>, a novel <strong>bio-inert hardware</strong> that serves to alleviate the sample loss and adsorption issues.</p><p><strong>Increased Recovery and Reproducibility with NEW Biozen Oligo</strong></p><ul><li>BioTi™ Hardware Reduces Sample Loss and Adsorption</li><li>Robustness at High pH and Temperature</li><li>Core-Shell Advantage for High Efficiency</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Phenomenex_Biozen_Oligo_HPLC_Column_3cf3dd7577.webp" alt="Phenomenex: Biozen Oligo HPLC Column" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Phenomenex_Biozen_Oligo_HPLC_Column_3cf3dd7577.webp 245w," sizes="100vw" width="500" height="150"></p><ul><li><strong>Separation Mode:</strong> Reversed Phase</li><li><strong>Particle size: </strong>1.7, 2.6</li><li><strong>Recommended Use:</strong> Analytical characterization of oligonucleotides</li></ul><h4><strong>Patented Technology and Advanced Core-Shell Particle Chemistry</strong></h4><p><strong>Biozen Oligo utilizes organo-silica core-shell technology to:​</strong></p><ul><li>Minimize band broadening associated with diffusion and oligonucleotide mass transfer kinetics​</li><li>Increase efficiency to produce narrower peaks, ideal for resolving closely eluting impurities​</li><li>Patented grafting process ensures high pH and temperature resistance from ethylene cross-linking.​</li></ul><p>&nbsp;</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Phenomenex_Patented_Technology_and_Advanced_Core_Shell_Particle_Chemistry_ca0e0a2b72.jpg" alt="Phenomenex: Patented Technology and Advanced Core-Shell Particle Chemistry" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Phenomenex_Patented_Technology_and_Advanced_Core_Shell_Particle_Chemistry_ca0e0a2b72.jpg 245w," sizes="100vw" width="905" height="454"></p><h4><strong>BioTi vs Stainless Steel Column Hardware​</strong></h4><p>Biozen Oligo's bioinert hardware enhances recovery, sensitivity, and chromatographic reproducibility by mitigating non-specific adsorption. Stainless steel equivalents fails to prevent this resulting in poor recovery, peak tailing, and residual carryover.​</p><h3><strong>Phenomenex Biozen Biologics LC Columns</strong></h3><p>With a new titanium <strong>BioTi™</strong> biocompatible <strong>hardware</strong> to minimize priming, <strong>four particle platforms</strong> for optimal versatility and <strong>nine particle chemistries</strong> to maximize selectivity and sensitivity, Biozen UHPLC/HPLC columns for <strong>protein analysis</strong> are seamlessly designed to bring peace of mind to your analysis of biologics through:</p><ul><li>Charge Variant Analysis</li><li>Aggregate Analysis</li><li>Peptide Mapping</li><li>Intact Mass Analysis</li><li>Intact and Subunit Analysis</li><li>Glycan Analysis</li><li>Peptide Quantitation</li><li>Drug Antibody Ratio (DAR)</li><li>Oligonucleotide Characterization</li></ul><h3><strong>Biocompatible Flow Path with BioTi™ Hardware</strong></h3><p>Keep your mind at ease knowing that we’ve minimized the need for priming with a new titanium infused biocompatible hardware and frit that doesn’t interfere with protein or peptide integrity!</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Phenomenex_Bio_Ti_Hardware_991fb53395.jpg" alt="Phenomenex: BioTi Hardware" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Phenomenex_Bio_Ti_Hardware_991fb53395.jpg 245w," sizes="100vw" width="1378" height="426"></p><h3><strong>4 Advanced Particle Platforms</strong></h3><p>All four of the Biozen particle platforms were individually designed and built by Phenomenex to take advantage of integral levels of performance, ruggedness, and reproducibility for protein characterization applications. Individually, each platform differs in the proprietary processing techniques used to control particle size and morphology.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Phenomenex_Advanced_Particle_Platforms_a0959aca03.jpg" alt="Phenomenex: Advanced Particle Platforms" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Phenomenex_Advanced_Particle_Platforms_a0959aca03.jpg 245w," sizes="100vw" width="1439" height="868"></p>

Thermo Scientific Accucore Vanquish C18+ UHPLC Columns

Choose Thermo Scientific™ Accucore™ Vanquish™ C18+ UHPLC columns, containing uniquely efficient 1.5 μm solid core particles for use with the Thermo Scientific™ Vanquish™ UHPLC system

<p><strong>Choose Thermo Scientific™ Accucore™ Vanquish™ C18+ UHPLC columns, containing uniquely efficient 1.5 μm solid core particles for use with the </strong><a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/products?category=40&amp;manufacturerItems=3"><strong>Thermo Scientific™ Vanquish™ UHPLC system</strong></a>. Founded on state-of-the-art Core Enhanced Technology™, this sub-2 μm particle next-generation column has ultra-short diffusion paths that result in extremely efficient separations. This high efficiency enables fast separation and the resolution of complex mixtures. In concert with Vanquish systems, these columns deliver more results with better separations, thereby enhancing workflows and productivity.</p><h4><strong>Specifications</strong></h4><ul><li><strong>Endcapped:</strong> Yes</li><li><strong>For Use With:</strong> UHPLC</li><li><strong>Max. Pressure: </strong>21756 psi (1500 bar)</li><li><strong>Packing Material:</strong> Spherical, Solid Core, Ultrapure Silica</li><li><strong>Particle Shape:</strong> Spherical Solid Core</li><li><strong>Stationary Phase:</strong> C18</li><li><strong>Surface Area:</strong> 110 m²/g</li><li><strong>Temperature:</strong> 70°C</li><li><strong>USP Type: </strong>L1</li><li><strong>Carbon Load</strong>: 6.5%</li><li><strong>Phase:</strong> Reversed Phase</li><li><strong>Pore Size: </strong>80 Å</li><li><strong>pH: </strong>2 to 9</li></ul>

Thermo Scientific Accucore C18 HPLC Columns

Use this column, with its specially designed solid core, for a broad range of nonpolar analytes across multiple applications.

<p><strong>Achieve fast, high-resolution separations at low backpressures using Thermo Scientific™ Accucore™ C18 LC columns. Rugged 2.6μm solid-core particles ensure high efficiencies and enable compatibility with both HPLC and UHPLC platforms.&nbsp;</strong></p><p>The high bonded phase coverage provides optimal retention of a broad range of nonpolar analytes across multiple applications. Robust bonding technology and automated packing procedures ensure excellent reproducibility and long column lifetimes.</p><h5><strong>Optimal Selectivity for Nonpolar Compounds</strong></h5><ul><li>Hydrophobic interaction mechanism</li></ul><h5><strong>Fast Separations</strong></h5><ul><li>2.6μm core-enhanced technology particles enable operation at high flow rates without generating excessive backpressures.</li></ul><h5><strong>Excellent Peak Shapes for Enhanced Resolution and Sensitivity</strong></h5><ul><li>Solid core 2.6μm particles and narrow particle size distribution reduce band broadening and improve separation efficiencies.</li><li>High surface coverage of silica minimizes secondary interactions and peak tailing.</li></ul><h5><strong>Low Backpressures</strong></h5><ul><li>Solid core 2.6μm particles for less backpressure compared to UHPLC sub-2μm particles</li><li>Compatible with conventional HPLC instrumentation and UHPLC platforms</li></ul><h5><strong>Excellent Reproducibility and Robustness</strong></h5><ul><li>Advanced bonding technology</li><li>Automated packing process</li></ul><h4><strong>Specifications</strong></h4><ul><li><strong>Endcapped:</strong> Yes</li><li><strong>For Use With:</strong> HPLC</li><li><strong>Max. Pressure: </strong>14500 psi (1000 bar)</li><li><strong>Packing Material:</strong> Spherical, Solid Core, Ultrapure Silica</li><li><strong>Particle Shape:</strong> Spherical Solid Core</li><li><strong>Stationary Phase:</strong> C18</li><li><strong>Surface Area:</strong> 130 m²/g</li><li><strong>Temperature:</strong> 70°C</li><li><strong>USP Type: </strong>L1</li><li><strong>Carbon Load</strong>: 9%</li><li><strong>Phase:</strong> Reversed Phase</li><li><strong>Pore Size: </strong>80 Å</li><li><strong>pH: </strong>1 to 11</li></ul>

Thermo Scientific Accucore aQ C18 Polar Endcapped HPLC Columns

Separate polar compounds with improved speed and resolution using Thermo Scientific™ Accucore™ aQ C18 Polar Endcapped LC columns.

<p><strong>Separate polar compounds with improved speed and resolution using Thermo Scientific™ Accucore™ aQ C18 Polar Endcapped LC columns. Rugged 2.6μm solid-core particles enable fast, high-efficiency separations at low backpressures.</strong></p><p>The polar endcapped C18 stationary phase provides optimal retention of polar analytes and is fully compatible with 100% aqueous mobile phases. Robust bonding technology and automated packing procedures ensure excellent reproducibility and long column lifetimes.</p><h5><strong>Alternative Selectivity</strong></h5><ul><li>Polar endcapped C18 stationary phase provides optimum retention of polar analytes</li><li>Accucore aQ Columns are compatible with highly aqueous mobile phases.</li><li>Polar encapping allows use in 100% aqueous mobile phases without loss of performance or stability.</li></ul><h5><strong>Fast Separations</strong></h5><ul><li>2.6μm core-enhanced technology particles enable operation at high flow rates without generating excessive backpressures.</li></ul><h5><strong>Excellent Peak Shapes for Enhanced Resolution and Sensitivity</strong></h5><ul><li>Solid-core 2.6μm particles and narrow particle size distribution reduce band broadening and improve separation efficiencies.</li><li>High surface coverage of silica minimizes secondary interactions and peak tailing.</li></ul><h5><strong>Low Backpressures</strong></h5><ul><li>Solid-core 2.6μm particles for less backpressure compared to UHPLC sub-2μm particles</li><li>Compatible with conventional HPLC instrumentation and UHPLC platforms</li></ul><h5><strong>Excellent Reproducibility and Robustness</strong></h5><ul><li>Advanced bonding technology</li><li>Automated packing process</li></ul><h4><strong>Specifications</strong></h4><ul><li><strong>Endcapped:</strong> Polar</li><li><strong>Max. Pressure: </strong>14500 psi (1000 bar)</li><li><strong>Packing Material:</strong> Spherical, Solid Core, Ultrapure Silica</li><li><strong>Particle Shape:</strong> Spherical Solid Core</li><li><strong>Stationary Phase:</strong> C18</li><li><strong>Surface Area:</strong> 130 m²/g</li><li><strong>Temperature:</strong> 70°C</li><li><strong>USP Type: </strong>L1</li><li><strong>Carbon Load</strong>: 9%</li><li><strong>Phase:</strong> Reversed Phase</li><li><strong>Pore Size: </strong>80 Å</li><li><strong>pH: </strong>2 to 9</li></ul>

Thermo Scientific Accucore Polar Premium HPLC Columns

Achieve fast, high-resolution separations of polar and nonpolar analytes using Thermo Scientific™ Accucore™ Polar Premium LC columns.

<p><strong>Achieve fast, high-resolution separations of polar and nonpolar analytes using Thermo Scientific™ Accucore™ Polar Premium LC columns. Rugged 2.6μm solid-core particles enable fast, high-efficiency separations at low backpressures.&nbsp;</strong></p><p>The robust amide-embedded C18 stationary phase provides unique selectivity complementary to conventional C18 columns, is stable from pH 1.5–10, and is fully compatible with highly aqueous mobile phases. Robust bonding technology and automated packing procedures ensure excellent reproducibility and long column lifetimes.</p><h5><strong>Alternative Selectivity</strong></h5><ul><li>Polar embedded reverse phase material offers complementary selectivity to standard C18 columns.</li></ul><h5><strong>Stable over Wide pH Range</strong></h5><ul><li>Specially designed bonded phase is stable from pH 1.5–10.5.</li></ul><h5><strong>Compatible with Highly Aqueous Mobile Phases</strong></h5><ul><li>Rugged amide-embedded C18 phase will not undergo phase collapse in 100% aqueous mobile phase.</li></ul><h5><strong>Fast Separations</strong></h5><ul><li>2.6μm core-enhanced technology particles enable operation at high flow rates without generating excessive backpressures.</li></ul><h5><strong>Excellent Peak Shapes for Enhanced Resolution and Sensitivity</strong></h5><ul><li>Solid-core 2.6μm particles and narrow particle size distribution reduce band broadening and improve separation efficiencies.</li><li>High surface coverage of silica minimizes secondary interactions and peak tailing.</li></ul><h5><strong>Low Backpressures</strong></h5><ul><li>Solid-core 2.6μm particles for less backpressure compared to UHPLC sub-2μm particles</li><li>Compatible with conventional HPLC instrumentation and UHPLC platforms</li></ul><h5><strong>Excellent Reproducibility and Robustness</strong></h5><ul><li>Advanced bonding technology</li><li>Automated packing process</li></ul><h4><strong>Specifications</strong></h4><ul><li><strong>Endcapped:</strong> Yes</li><li><strong>Max. Pressure: </strong>14500 psi (1000 bar)</li><li><strong>Packing Material:</strong> Spherical, Solid Core, Ultrapure Silica</li><li><strong>Particle Shape:</strong> Spherical Solid Core</li><li><strong>Stationary Phase:</strong> Polar Embedded</li><li><strong>Surface Area:</strong> 90 m²/g</li><li><strong>Temperature:</strong> 70°C</li><li><strong>USP Type: </strong>L60</li><li><strong>Carbon Load</strong>: 9%</li><li><strong>Phase:</strong> Reversed Phase</li><li><strong>Pore Size: </strong>150 Å</li><li><strong>pH: </strong>1.5 to 10.5</li></ul>

Products from category C18 HPLC columns - page 6

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