<p><strong>A team from CEITEC Masaryk University (MUNI) in collaboration with researchers from two research institutes in Norway has, for the first time, captured how echovirus 18, a member of the enterovirus genus, releases its genetic material into cells to initiate infection. The study provides a structural view of an early stage of viral infection under near-native conditions. Using cryo-electron microscopy, the researchers discovered that the virus does not release its RNA through a small pore in its capsid, as had long been assumed. Instead, its protein shell partially disassembles, creating a large opening through which the viral genetic material escapes into the host cell. A detailed understanding of this genome release mechanism could eventually help develop compounds preventing enteroviruses from infecting cells.</strong></p><p>Enteroviruses are common human pathogens causing diseases ranging from the common cold and gastrointestinal infections to severe neurological disorders. Echovirus 18, the virus investigated in this study, is known primarily as a cause of meningitis and encephalitis in children. It belongs to the picornaviruses, a family of small, non-enveloped viruses whose genetic material is protected by a protein shell, the capsid, organized with icosahedral symmetry.</p><p>To replicate within a cell, the enteroviruses must release their RNA – the molecule that carries viral genetic information – from the capsid, into the cell cytoplasm. Although this step is crucial for initiating infection, it has never been observed in infected cells.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/CEITEC_Vedci_z_CEITEC_jako_prvni_zachytili_jak_enteroviry_spousteji_infekci_bunek_71d553bb0e.jpg" alt="CEITEC/Plevka Lab: CEITEC Scientists Are the First to Capture How Enteroviruses Initiate Infection: View into a cell infected by echovirus 18. Echovirus 18 is shown in green and yellow, ribosomes in violet, and actin filaments in cyan. Scale 50 nm. " srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_CEITEC_Vedci_z_CEITEC_jako_prvni_zachytili_jak_enteroviry_spousteji_infekci_bunek_71d553bb0e.jpg 221w," sizes="100vw" width="1600" height="1128"></p><p><i>“For a long time, two main theories existed about how picornaviruses deliver their RNA genomes into cells. One proposed that the genome leaves the capsid through a small opening. The other, supported by earlier work from our laboratory, suggested that the genome escapes from partially disassembled capsids missing pentamers of capsid proteins. However, both models were based on experiments with virus particles outside cells. We wanted to go one step further and see what really happens during infection inside a cell,”</i> says <a target="_blank" rel="noopener noreferrer" href="https://www.ceitec.eu/liya-mukhamedova-ph-d/u89248?page=publication"><strong>Liya Mukhamedova</strong></a><strong>, the study’s first author from CEITEC MUNI</strong>.</p><p>Using cryo-electron microscopy, which allows scientists to visualize biological structures at exceptionally high resolution, the researchers observed individual echovirus 18 particles directly within infected cells. They discovered that empty virus particles in infected cells lack parts of their capsids. It is through these openings that the virus releases its RNA.</p><p>The study also revealed the role of the FcRn receptor, a cell-surface molecule that enteroviruses use to enter cells. The binding of the virus to the receptor triggers structural changes in the viral particle that prime it for subsequent genome release. The team showed that receptor binding causes the loss of the so-called pocket factor, a small molecule that normally helps stabilize the virus particle. The virus otherwise remains largely intact, suggesting that receptor binding is only the first step toward uncoating, while additional factors within the cell are required to complete the process and trigger genome release.</p><p><i>“Infection is a complex process, during which enterovirus particles sense various interactions with cell components. The binding of echovirus 18 to the FcRn host-cell receptor triggers conformational changes in the virus, priming it for genome release.”</i> – explains <a target="_blank" rel="noopener noreferrer" href="https://www.ceitec.eu/pavel-plevka-ph-d/u26854"><strong>Pavel Plevka</strong></a><strong>, head of the Structural Virology Research Group</strong>.</p><p>The researchers did not observe the so-called activated particles that are key intermediates in the enterovirus uncoating process. This suggests that genome release in cells occurs much faster than previous experiments had suggested.</p><p>By combining structural data obtained from studies of virus particles outside living cells with observations of infected cells, the study offers a picture of how enterovirus infection begins. Moving beyond simplified experiments with isolated virus particles, it brings scientists closer to understanding the earliest stages of enterovirus infection as they occur in living cells. The study, was published in the <a target="_blank" rel="noopener noreferrer" href="https://doi.org/10.1073/pnas.2601182123"><strong>PNAS journal</strong></a>.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/CEITEC_Vedci_z_CEITEC_jako_prvni_zachytili_jak_enteroviry_spousteji_infekci_bunek_2_3601bf1df9.jpg" alt="CEITEC/Plevka Lab: CEITEC Scientists Are the First to Capture How Enteroviruses Initiate Infection: Reconstructions of E18 particles from infected cells. The particles are rainbow-colored based on the distance from the particle center. Scale 10 nm." srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_CEITEC_Vedci_z_CEITEC_jako_prvni_zachytili_jak_enteroviry_spousteji_infekci_bunek_2_3601bf1df9.jpg 245w," sizes="100vw" width="1600" height="906"></p><blockquote><h4><strong>Article</strong></h4><h4><a target="_blank" rel="noopener noreferrer" href="https://www.pnas.org/doi/10.1073/pnas.2601182123"><strong>Particles of echovirus 18 open to release their genomes in vivo</strong></a></h4><p>Liya Mukhamedova, David Buchta, Zuzana Trebichalská, Yevgen Levdansky, Jana Moravcová, David Potěšil, Zbyněk Zdráhal, Dominik Hřebík, Lucie Nepovímová, Torleif Tollefsrud Gjølberg, Jan Terje Andersen, Jiří Nováček, Tibor Füzik, and Pavel Plevka</p><p><i><strong>Proc. Natl. Acad. Sci. U.S.A.</strong></i>, 2026, <strong>123</strong>, e2601182123</p><div>&nbsp;</div><div><a target="_blank" rel="noopener noreferrer" href="https://doi.org/10.1073/pnas.2601182123">https://doi.org/10.1073/pnas.2601182123</a></div><h6>licenced under <a target="_blank" rel="noopener noreferrer" href="https://creativecommons.org/licenses/by/4.0/"><strong>CC-BY 4.0</strong></a></h6></blockquote><h4><strong>Abstract</strong></h4><p>Enteroviruses cause a broad spectrum of human diseases, ranging from mild respiratory or gastrointestinal infections to severe neurological disorders such as aseptic meningitis and encephalitis. Enterovirus cell entry involves receptor-mediated endocytosis followed by destabilizing rearrangements of the virus capsid that enable genome release. However, the mechanism of enterovirus genome release has not been visualized in infected cells. Here, we used cryoelectron tomography and microscopy to image echovirus 18 (E18) entry into host cells and its interaction with the neonatal Fc receptor (FcRn). 30 min postinfection, endosomes and cytoplasm contained empty capsids missing one or several pentamers of capsid proteins, providing evidence that in vivo E18 releases its genome through capsid opening. In vitro, FcRn binding induced the expulsion of pocket factors from hydrophobic pockets in VP1, priming the virus for uncoating. The cryoelectron microscopy reconstruction of genome-containing particles of E18 inside infected cells did not reveal pocket factors, indicating that receptor binding triggers the same priming process during infection. We did not detect activated particles in infected cells, suggesting that these intermediates are short-lived and rapidly release their genomes in vivo. Our results identify capsid opening as the in vivo mechanism of echovirus 18 genome release, providing structural evidence for a process previously only inferred from in vitro experiments.</p>

CEITEC Scientists Are the First to Capture How Enteroviruses Initiate Infection 

<p><strong>ISC 2026 officially opened in Prague on Sunday, September 6, bringing the international separation science community together at the Prague Congress Centre. The first day began with six Short Courses covering topics from analytical procedure lifecycle and mass spectral interpretation to HILIC, oligonucleotides, LC/MS data analysis, and supercritical fluids. In the afternoon, conference chairs Michal Holčapek and Lucie Nováková welcomed participants during the Opening Ceremony, followed by the J.F.K. Huber Medal Award Ceremony. The scientific program then moved into its first plenary session, spanning spintronics, single-cell proteomics and robust LC-MS, and rapid evaporative ionisation mass spectrometry. The opening day concluded with the Welcome Reception, giving participants their first opportunity to meet colleagues from around the world and begin a week of scientific exchange, new ideas, and chromatography in the heart of Prague.</strong></p><h4><strong>Sunday, September 6th</strong></h4><h5><span><strong>8:30–15:45 Short Courses 3 - 8</strong></span></h5><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/ISC_ISC_2026_Day_1_Short_Courses_Koen_Sandra_176f1c6d52.jpg" alt="ISC: ISC 2026 - Day 1: Short Course SC 6 Oligonucleotides and Other Biopharmaceuticals (Koen Sandra)" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_ISC_ISC_2026_Day_1_Short_Courses_Koen_Sandra_176f1c6d52.jpg 235w," sizes="100vw" width="1600" height="1067"></p><h5><span><strong>16:00–16:30 Opening Ceremony</strong></span></h5><ul><li><a target="_blank" rel="noopener noreferrer" href="https://labrulez.com/en-us/lcms/articles?search=hol%C4%8Dapek"><span><strong>Michal Holčapek</strong></span></a><span>, Czech Republic</span></li><li><a target="_blank" rel="noopener noreferrer" href="https://labrulez.com/en-us/lcms/articles?search=Lucie+Nov%C3%A1kov%C3%A1"><span><strong>Lucie Nováková</strong></span></a><span>, Czech Republic</span></li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/ISC_ISC_2026_Day_1_Opening_Novakova_and_Holcapek_bbf9dd44e3.jpg" alt="ISC: ISC 2026 - Day 1: Michal Holčapek and Lucie Nováková opened ISC 2026" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_ISC_ISC_2026_Day_1_Opening_Novakova_and_Holcapek_bbf9dd44e3.jpg 235w," sizes="100vw" width="1600" height="1067"></p><h5><span><strong>16:30–17:00 Award Ceremony</strong></span></h5><ul><li>J.F.K. Huber Medal (awarded by the Austrian Society for Analytical Chemistry)</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/ISC_ISC_2026_Day_1_JFK_Huber_Award_winner_Dave_846f6a5dff.jpg" alt="ISC: ISC 2026 - Day 1: Davy Guillarme as a 2026 recipient of the J.F.K. Lecture Award of the Austrian Society of Analytical Chemistry" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_ISC_ISC_2026_Day_1_JFK_Huber_Award_winner_Dave_846f6a5dff.jpg 235w," sizes="100vw" width="1600" height="1066"></p><h4><strong>Plenary lectures</strong></h4><h5><strong>17:00 - 17:30 Spintronics: A new paradigm in digital bits</strong></h5><ul><li>Tomáš Jungwirth, Czech Republic&nbsp;&nbsp;&nbsp;&nbsp;</li></ul><p>Besides the rapid developments in the big world of cloud data centers and AI, a remarkable paradigm shift is occurring on the level of the smallest “elementary particle” of information technologies – the single physical bit. For the first time in the history of microprocessor chips, semiconductor bits are being replaced by a fundamentally distinct technology. The technology is based on magnets and is called spintronics. All major developers and manufacturers of the advanced chip technologies are now implementing these new spintronic bits. Not across the entire microprocessor chip, but in some of its vital memory parts. The transition to the spintronic bits is happening because further miniaturization of semiconductor bits has become prohibitively expensive or even reached fundamental physical limits. In the talk we will introduce the distinct physical principle behind the spintronic bits, and highlight some of the recent adbances in spintronics research and development.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/ISC_ISC_2026_Day_1_Tomas_Jungwirth_dd6eeca2b5.jpg" alt="ISC: ISC 2026 - Day 1: Spintronics: A new paradigm in digital bits (Tomáš Jungwirth, Czech Republic)" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_ISC_ISC_2026_Day_1_Tomas_Jungwirth_dd6eeca2b5.jpg 245w," sizes="100vw" width="1595" height="1008"></p><h5><strong>17:30 - 18:00 Single cell proteomics requires robust LC-MS: Unexpected findings bring new biological understanding</strong></h5><ul><li>Jennifer Van Eyk, USA&nbsp;&nbsp;&nbsp;&nbsp;</li></ul><p>Underlying precision medicine is the concept that an individual’s Omic signature (including the proteome) will provide a physician with clinically actionable diagnosis and a subsequent mechanistic therapeutic route that is appropriate for a particular person. This concept is based on the idea of pathological heterogeneity and recognizes the impact of differences in the heath state of individuals. The deployment of single cell technologies has demonstrated heterogeneity within a single cell type which impacts the degree of cellular heterogeneity within an organ. Unlike bulk proteomic approaches, which average signals across heterogeneous populations, single-cell proteomics captures the molecular diversity of cell. Today single-cell proteomics can provide high-resolution characterization of protein quantities and variability within the structural composition and signaling dynamics within individual cells which requires robust, precise and sensitive liquid chromatography and mass spectrometry (LC-MS) workflows with sufficient throughput to quantitatively analyze 1000s of single cells.</p><p>We have developed stable and precise single cell LC-MS workflow based on high-flow, dual trap with a single analytical column system that can achieve 96 samples per day. Furthermore, we have coupled this with a novel parallel sample preparation method on demand within the autosampler reducing sample lose and matching throughput with the LC-MS. Here, we have investigated the proteomic heterogeneity of cardiac muscle cells, cardiomyocytes, the specialized cells that contain the contractile proteins and which are responsible for the heart contraction and relaxation. By applying single-cell proteomics to cardiomyocytes isolated from human and mouse hearts, as well as human iPSC-derived cardiomyocytes, we uncovered previously unrecognized cellular subpopulations distinguished by differences in contractile and metabolic protein expression. As well unexpectedly, we unambiguously identified proteins traditionally considered absent in adult cardiomyocyte, such as slow skeletal troponin T, previously thought to be restricted to fetal or skeletal muscle or those proposed to be limited to non-cardiac cell types (e.g., neuronal proteins) or species (e.g., myosin heavy chain 7b). This suggests an unexpected fluidity in cardiac protein expression. Furthermore, single cell proteomics has provided critical insight into protein-level remodeling in heart failure, where the same single amino acid mutation in a contractile protein can give rise to diverse clinical phenotypes. At the single cell level, the mutant protein dosage in each cell drives a continuum of subproteomic pathological alterations. Only with precise protein quantification at the single cell level, is this understanding possible – all of which hinges on the LC-MS performance.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/ISC_ISC_2026_Day_1_Jennifer_Van_Eyk_f8641196ff.jpg" alt="ISC: ISC 2026 - Day 1: Single cell proteomics requires robust LC-MS: Unexpected findings bring new biological understanding (Jennifer Van Eyk, USA)" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_ISC_ISC_2026_Day_1_Jennifer_Van_Eyk_f8641196ff.jpg 235w," sizes="100vw" width="1600" height="1066"></p><h5><strong>18:00 - 18:30 Rapid evaporative ionisation mass spectrometry: From MSI to LC-MS</strong></h5><ul><li>Zoltan Takats, United Kingdom&nbsp;&nbsp;&nbsp;&nbsp;</li></ul><p>Rapid Evaporative Ionisation Mass Spectrometry (REIMS) was originally developed for mass spectrometry-guided surgery applications, enabling the direct, real-time analysis of surgical aerosols for in-situ histological identification of tissues in cancer surgery. Coupling the technique with various surgical and non-surgical lasers led to the recognition, that the technique has comparable sensitivity to other, widely used desorption ionisation methods including DESI and MALDI. Laser Ablation REIMS using 3 μm wavelength picosecond lasers was demonstrated to provide sub-cellular resolution metabolic and lipidomic images at 2-5 μm spatial resolution, with clear visualisation of cellular nuclei. The method was subsequently used for regenerative neuroscience and cancer biology applications. The unexpectedly high sensitivity of the method (fg amounts of lipids and metabolites / pixel) encouraged us to attempt using REIMS as an LC-MS ion source. The current commercially available REIMS instrumentation utilises the so-called matrix-assited REIMS technology, involving the co-introduction of a polar solvent (water, acetonitrile or aliphatic alcohols) together with the sample aerosol. The fused droplets containing solvent and soluble components of the aerosol are introduced into the vacuum where they impact a heated (≈900 ºC) surface resulting in their 'rapid evaporation' yielding the detected ion population. In this context, the ionisation matrix was replaced by LC effluent, leading to a fundamentally new way of ionisation. The new technique termed LC-REIMS was characterised using reversed phase LC applications including lipid and metabolite profiling. The new ionisation method was found to exhibit high similarity to sonic spray and related techniques, in spite of the high temperature involved. Analytical sensitivity for complex lipids and amino acids were found to be comparable to those in ESI or APCI, albeit the relative response factors followed markedly different trends. As the technology represents an LC-MS coupling without any requirement for pressurised gas or high voltage, it has significant application potential for field instrumentation including industrial process control or security screening.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/ISC_ISC_2026_Day_1_Zoltan_Takats_3e0c11a22e.jpg" alt="ISC: ISC 2026 - Day 1: Rapid evaporative ionisation mass spectrometry: From MSI to LC-MS (Zoltan Takats, United Kingdom)" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_ISC_ISC_2026_Day_1_Zoltan_Takats_3e0c11a22e.jpg 129w," sizes="100vw" width="1600" height="1933"></p><h5><span><strong>18:30–19:30 Welcome Reception</strong></span></h5><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/ISC_ISC_2026_Day_1_Welcome_reception_36bfcb7276.jpg" alt="ISC: ISC 2026 - Day 1: Welcome reception" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_ISC_ISC_2026_Day_1_Welcome_reception_36bfcb7276.jpg 235w," sizes="100vw" width="1600" height="1067"></p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/ISC_ISC_2026_Day_1_Welcome_reception_2_4ae69091a6.jpg" alt="ISC: ISC 2026 - Day 1: Welcome reception" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_ISC_ISC_2026_Day_1_Welcome_reception_2_4ae69091a6.jpg 235w," sizes="100vw" width="1600" height="1067"></p>

ISC 2026 - Day 1

ISC 2026 - Day 2

Article

Events

Science and research

Since its establishment in 2011, CEITEC has quickly developed into a cutting-edge infrastructure for research which performs highly alongside the best institutes in Europe. Among the main priorities of CEITEC are the promotion of a motivating and dynamic international scientific environment, the provision of state-of-the-art research infrastructure, and the policy of open communication and equal opportunities.

CEITEC

The International Symposium on Chromatography (ISC) represents the oldest conference series focussing on separation science. ISC symposia have been organised since 1956 in each even year. ISC is internationally recognised as one of the premier meeting series for discussion of all modes of chromatography and separation science with a broad coverage of techniques and applications.

International Symposium on Chromatography - (ISC)

Thermo Scientific mzCloud Mass Spectral Library

mzCloud is a high-resolution, accurate-mass MSⁿ spectral library that helps identify unknown compounds when no reference standards are available, especially in complex studies.

<div colctrl-id="1-1"><div><div container-id="cq-colctrl-lt8" comp-id="B1"><div><h3><strong>Confident identification for unknown small molecules</strong></h3></div></div><div container-id="cq-colctrl-lt8" comp-id="B2"><div><p><strong>Mass spectral libraries and databases may be required to identify unknown compounds when reference standards are not available. This is particularly true for studies in areas such as metabolomics, forensic toxicology, food &amp; beverage, environmental emerging contaminants or extractables &amp; leachables.</strong></p></div></div></div></div><div><p>In these situations, a mass spectral library, particularly a high-resolution and accurate-mass MS<sup>n</sup> fragmentation library, such as the mzCloud mass spectral library, can provide the information required to confidently identify unknown compounds.</p><h3><strong>Key benefits</strong></h3><h5><strong>Confidence for unknown identification</strong></h5><p>Comprehensive curation of all library content with extensive, fully annotated and searchable fragmentation spectra to provide confidence in your results.</p><h5><strong>Know more unknowns&nbsp;&nbsp;&nbsp;&nbsp;</strong></h5><p>Identify unknowns with automated deconvolution and library searching against extensive fragmentation spectra covering a wide chemical space, including small molecule applications.</p><h5><strong>From spectra to structure&nbsp;&nbsp;</strong></h5><p>With solutions to cover infusion or LC-MS, nominal or high-resolution data, you can be sure that your MS<sup>n</sup> spectra will provide you with actionable results, even when there is no spectral library match.</p><h5><strong>Flexibility for research and routine applications</strong></h5><p>Search for free online at <a target="_blank" rel="noopener noreferrer" href="http://www.mzcloud.org/" aria-label="mzCloud.org - open in a new tab" data-uw-rm-ext-link="" uw-rm-external-link-id="http://www.mzcloud.org/$mzcloud.org"><span style="white-space:nowrap;">mzCloud.org</span></a>, or directly access through the Thermo Scientific Compound Discoverer and Mass Frontier software packages. Not online? mzVault provides you with the ability to perform offline spectral library searching.</p><figure class="image"><img style="aspect-ratio:1398/1002;" src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Thermo_Scientific_mz_Cloud_Mass_Spectral_Library_ecc79fe9bf.jpg" alt="Thermo Scientific mzCloud Mass Spectral Library: mzCloud is easily and freely accessed online. Anyone can search, review, and use its extensive information. Note that the numbers above were correct at time of publication. For the most up to date numbers visit mzCloud.org." srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Thermo_Scientific_mz_Cloud_Mass_Spectral_Library_ecc79fe9bf.jpg 218w," sizes="100vw" width="1398" height="1002"></figure><h3><strong>What is in the mzCloud mass spectral library?</strong></h3><div style="height:auto;" id="whatismzcloud"><div><div><div><div><p>mzCloud is an extensively curated, high-quality mass spectral fragmentation library that contains significant amounts of spectra and metadata for each entry. Each entry also includes exhaustive high-resolution <a target="_blank" rel="noopener noreferrer" href="https://www.thermofisher.com/cz/en/home/industrial/mass-spectrometry/liquid-chromatography-mass-spectrometry-lc-ms/lc-ms-software/mass-spectral-libraries/mzcloud-mass-spectral-library.html?open=multi-stage-fragmentation#multi-stage-fragmentation">MS/MS and multi-stage MS<sup>n</sup> spectra</a>, which have been acquired at various collision energies and using different fragmentation techniques.</p><p><strong>Each raw mass spectrum</strong> has been filtered to remove noise, recalibrated to ensure absolute mass accuracy, fully annotated and <a target="_blank" rel="noopener noreferrer" href="https://www.thermofisher.com/cz/en/home/industrial/mass-spectrometry/liquid-chromatography-mass-spectrometry-lc-ms/lc-ms-software/mass-spectral-libraries/mzcloud-mass-spectral-library.html?open=content-curation#content-curation">curated</a> to ensure quality and consistency.</p><p>Finally, the contents of the library are <strong>updated weekly</strong> to provide coverage of a wide chemical space, ensuring relevance to all small-molecule application areas.</p></div><div><figure class="image"><img style="aspect-ratio:740/410;" src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Thermo_Scientific_mz_Cloud_Mass_Spectral_Library_2_77a6795676.jpg" alt="Thermo Scientific mzCloud Mass Spectral Library: Example of the Mass Frontier software utilizing the contents of mzCloud to identify an unknown compound through a sub-structural search; the experimental fragmentation spectrum (top left) is searched against the mzCloud mass spectral database, with corresponding spectral hits shown in a given spectral tree (top, middle), with supporting spectral information (bottom left) and the identified precursor structure from the matched fragmentation spectra (bottom right), and the library compound structure from which the fragment originated (top right)." srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Thermo_Scientific_mz_Cloud_Mass_Spectral_Library_2_77a6795676.jpg 245w," sizes="100vw" width="740" height="410"></figure></div><div><p>Distinguishing among types of databases is important, as the contents and quality of the contents typically differs significantly and may have an impact upon the reliability of the data and the confidence in any results obtained.</p><ul><li><strong>Chemical database</strong>: A collection of chemical information with, at minimum, a name and a formula. It may also include structures, elemental composition, retention time information, and additional biological or chemical metadata.</li><li><strong>Accurate-mass (AM) database</strong>: An AM database contains accurate mass formulas.</li><li><strong>Accurate-mass retention-time (AMRT) database</strong>: An AMRT database contains accurate mass and retention time(s) for specific analytical methods.</li><li><strong>Library</strong>: A library is a database (AM or AMRT) that, in addition to the above, also contains reference mass spectral data, MS/MS, and/or MS<sup>n</sup> data on compounds.</li></ul><h3><strong>Multi-stage fragmentation in the mzCloud mass spectral library</strong></h3><div style="height:auto;" id="multistagefragmentation"><div><div><div><div><figure class="image"><img style="aspect-ratio:740/420;" src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Thermo_Scientific_mz_Cloud_Mass_Spectral_Library_3_792a9d9a59.jpg" alt="Thermo Scientific mzCloud Mass Spectral Library: A schematic representation of a spectral tree within mzCloud. The MS spectra are acquired for a given compound in multiple polarities (ESI +/-), and for a range of adducts. Each precursor is exhaustively fragmented using different fragmentation techniques (CID, HCD) and at multiple collision energies to produce collections of fragmentation spectra at each fragmentation level (MS2, MS3, MS4 etc.), generating a comprehensive spectral tree of information for each library entry." srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Thermo_Scientific_mz_Cloud_Mass_Spectral_Library_3_792a9d9a59.jpg 245w," sizes="100vw" width="740" height="420"></figure><p>mzCloud is an<strong> all-encompassing mass spectral library </strong>with content based on a wide chemical space (therefore covering all small-molecule application areas), and acquiring high-resolution and accurate-mass data at various collision energies, for multiple adducts, using CID and HCD. Approximately 10–20 collision energies are included for every precursor ion; this multi-stage, multidimensional MS<sup>n</sup> spectral data are arranged into spectral trees, which are both extensive and comprehensive, typically containing many hundreds to thousands of spectra for each compound, with many exceeding MS<sup>4</sup> fragmentation steps.</p><p>The extensive data for each library entry is critical for accurate compound identifications, matching experimentally obtained data to that of the library contents, with fit confidence and data visualization <strong>provided in the</strong><a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/products/1759"><strong> Compound Discoverer</strong></a><strong> and </strong><a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/products/1757"><strong>Mass Frontier</strong></a><strong> data analysis software.</strong> Additional tools in Compound Discoverer and Mass Frontier software, including <a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/products/1762"><strong>mzLogic</strong></a>, use the extensive fragmentation information to confidently identify unknowns that cannot be identified based upon the spectral library compound entries alone.</p><h3><strong>Content curation in the mzCloud mass spectral library</strong></h3><div style="height:auto;" id="contentcuration"><div><div><div><div><figure class="image"><img style="aspect-ratio:740/342;" src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Thermo_Scientific_mz_Cloud_Mass_Spectral_Library_4_c7064c2ca2.jpg" alt="Thermo Scientific mzCloud Mass Spectral Library: An example of the mass spectral content curation tool available within the Mass Frontier software. It contains all the functionality used to manually curate the content contained within mzCloud. The power of mzCloud lies in both the extent and high quality of its content, which helps make confident compound identifications." srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Thermo_Scientific_mz_Cloud_Mass_Spectral_Library_4_c7064c2ca2.jpg 245w," sizes="100vw" width="740" height="342"></figure><p>Despite the fact that <a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/products?category=5&amp;manufacturerItems=3&amp;search=orbitrap"><strong>Thermo Scientific Orbitrap-based mass analyzers</strong></a> routinely deliver sub 3-ppm mass errors, there is a small amount of inaccuracy in any experimental data used to search against a library; these errors would be compounded if the library itself also contained data with mass errors. The compounded errors would mean that any identifications could be harder to make or have lower confidence due to match scores being higher.</p><p>Curating the content within mzCloud guards against error and variability in the reference spectra against which data is compared. <strong>The process of curation involves:</strong></p><ul><li>Averaging multiple, individually acquired spectra</li><li>The removal of mass spectral noise</li><li>Recalibration of the mass spectra based upon the predicted formulas for the fragment ion elemental compositions, based upon the known elemental composition and structure of the precursor ion</li><li>Annotation of all fragment ions with the fragment structure</li><li>Addition of large amounts of metadata, including the source of the data and all original raw data files</li></ul><p>This curation process is performed <strong>for every spectra</strong> - every collision energy, every fragmentation type, every MS<sup>n</sup> level and for each precursor ion. As such, the spectral data in mzCloud is of <strong>exceedingly high quality </strong>and offers significant advantages over crowd-sourced libraries due to the high levels of control.</p><figure class="image"><img style="aspect-ratio:740/350;" src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Thermo_Scientific_mz_Cloud_Mass_Spectral_Library_5_0c3fdc4c6c.jpg" alt="Thermo Scientific mzCloud Mass Spectral Library: A recalibrated fragmentation spectrum showing no error on the highlighted peak at m/z 213.05462, along with all of the annotation that is provided for each spectra, at each collision energy, for each fragmentation type at each MSn level." srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Thermo_Scientific_mz_Cloud_Mass_Spectral_Library_5_0c3fdc4c6c.jpg 245w," sizes="100vw" width="740" height="350"></figure><div><div><div container-id="cq-colctrl-lt8" comp-id="B1"><div><h3><strong>How can I use the mzCloud mass spectral library?</strong></h3><p>Accelerate your small molecule unknown identification studies with <strong>mzCloud</strong>, <a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/products/1762"><strong>mzLogic</strong></a>, and the other data analysis and mass spectral prediction tools available in<strong> </strong><a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/products/1759"><strong>Compound Discoverer</strong></a> software and <a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/products/1757"><strong>Mass Frontier</strong></a><strong> </strong>software.</p><p><img style="aspect-ratio:860/261;" src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Thermo_Scientific_mz_Cloud_Mass_Spectral_Library_7_a8cefb0028.jpg" alt="Thermo Scientific mzCloud Mass Spectral Library: Connectivity of mzCloud and mzVault to Mass Frontier." srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Thermo_Scientific_mz_Cloud_Mass_Spectral_Library_7_a8cefb0028.jpg 245w," sizes="100vw" width="860" height="261"></p><p>The content within mzCloud is accessible through Compound Discoverer and Mass Frontier software packages, provided you have an internet connection. No internet? No problem – <a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/products/1760"><strong>mzVault</strong></a>, provides you with the MS and MS/MS content of mzCloud in an offline format.</p><div style="height:auto;" id="accessmzcloud"><div><div><div><div colctrl-id="3-1"><div><div container-id="cq-colctrl-lt8" comp-id="B1"><div><p><img style="aspect-ratio:860/242;" src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Thermo_Scientific_mz_Cloud_Mass_Spectral_Library_6_ae3c0a28e1.jpg" alt="Thermo Scientific mzCloud Mass Spectral Library: Connectivity of mzCloud and mzVault to Compound Discoverer." srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Thermo_Scientific_mz_Cloud_Mass_Spectral_Library_6_ae3c0a28e1.jpg 245w," sizes="100vw" width="860" height="242"></p><p>Due to security concerns or local firewalls, not everyone can connect processing PCs to the internet. With that in mind, the contents of mzCloud are combined into an offline version twice a year. The <a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/products/1760"><strong>mzVault</strong></a><strong> </strong>software application helps you access this information. In addition to accessing the offline version of mzCloud, the mzVault application can store and search your high-quality custom in-house (offline) MS/MS spectral libraries.</p></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>

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