Agilent Enhanced Matrix Removal—Lipid

Importance of the topic

Interferences from lipids pose a significant challenge in trace residue analysis of fatty foods and complex biological samples. Accumulation of lipids in chromatographic systems and mass spectrometer sources can shorten column lifetime, suppress analyte signals, and increase maintenance intervals. A sample-preparation approach that removes lipids while preserving target analytes is critical for reliable, high-throughput testing.

Goals and overview of the study

This application note evaluates the performance of Agilent Enhanced Matrix Removal—Lipid (EMR—Lipid) as a universal sorbent for QuEChERS workflows. The objectives are to demonstrate its lipid-removal efficiency, analyte recovery, impact on chromatographic quality, and benefits for laboratory productivity across diverse high-fat and complex matrices.

Methodology and instrumentation

The EMR—Lipid method replaces traditional C18/PSA cleanup in a six-step QuEChERS procedure: extraction/partition, dSPE with EMR—Lipid and water, mixing/centrifugation, optional polish, evaporation or dilution, and filtration into analysis vials. Performance was compared to C18/PSA and zirconia sorbents using fortified samples of avocado, oils, beef liver, spices, and cat food. Analyses were performed on Agilent triple quadrupole GC/MS (GC/QQQ) and LC/MS (LC/QQQ) systems.

Instrumentation Used

• Bond Elut EMR—Lipid dSPE tubes
• Bond Elut EMR—Lipid final polish tubes and MgSO₄ polish pouches
• Agilent 7890 GC with 7000 Series QQQ
• Agilent 1290 Infinity LC with 6495 Series QQQ

Main results and discussion

• Matrix removal reached up to 97% for beef liver, 92% for avocado, and 73–82% for various oils, outperforming C18/PSA.
• In 50 ppb pesticide fortifications in avocado, 92% of compounds achieved 70–120% recovery vs lower rates with alternative sorbents.
• Veterinary drug analysis in bovine liver showed a higher count of acceptable recoveries after EMR—Lipid cleanup compared to zirconia.
• Chromatograms exhibited enhanced analyte sensitivity, signal-to-noise ratios, and fewer interferences in GC/QQQ and LC/QQQ assays.
• After 100 avocado injections, EMR—Lipid maintained analyte response with only a 4% signal drop, versus 35% increase (C18/PSA) and 50% drop (zirconia), indicating more stable MS performance.
• Over 2,500 fatty-matrix injections, source tuning parameters remained within acceptance criteria much longer, reducing MS source replacements.
• %RSD values for 20 pesticides over 100 injections were consistently lower with EMR—Lipid (6–12%) than with C18/PSA (7–52%) or zirconia (15–42%).

Benefits and practical applications

• Improved data quality and confidence from reduced matrix interferences and higher precision.
• Streamlined workflows using a single, easy-to-use sorbent for a wide polarity range of analytes.
• Reduced instrument downtime and maintenance costs, enabling higher sample throughput.
• Lower inventory requirements and training overhead by standardizing on EMR—Lipid QuEChERS.

Future trends and applications

EMR—Lipid’s selective lipid removal can be integrated with emerging high-resolution MS, automated sample-prep platforms, and laboratory information management systems. Its adaptability to new food, environmental, and clinical matrices positions it for broader adoption in regulatory, quality-control, and research settings.

Conclusion

Agilent Enhanced Matrix Removal—Lipid offers a balanced solution for complex, high-fat samples, achieving outstanding lipid reduction without compromising analyte recovery. Its implementation enhances chromatographic performance, extends instrument upkeep intervals, and boosts laboratory efficiency, making it an invaluable tool for modern analytical workflows.