Journal
JOURNAL OF SEPARATION SCIENCE
Volume 45, Issue 16, Pages 3105-3114Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.202200402
Keywords
dielectric barrier discharge; neutral lipids; liquid chromatography; mass spectrometry
Categories
Funding
- Spanish Ministerio de Economia y Competitividad (MINECO) [PID2019-107691RB-I00]
- Ministerium fur Innovation, Wissenschaft und Forschung des Landes Nordrhein-Westfalen
- Senatsverwaltung fur Wirtschaft, Technologie und Forschung des Landes Berlin
- Ministerium fur Bildung und Forschung
- Deutsche Forschungsgemeinschaft
- Spanish Ministerio de Ciencia e Innovacion [RYC2019-026581-I]
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Dielectric barrier discharge ionization is a versatile technique for ionizing a wide range of molecules, including neutral lipids. This study evaluated the use of liquid chromatography coupled with dielectric barrier discharge ionization mass spectrometry for neutral lipid analysis. The results showed that this technique can provide improved sensitivity and comparable or better quantitation limits compared to atmospheric pressure chemical ionization. The analysis of archaeological samples revealed the potential vegetal origin of the stored material based on the presence of unsaturation and sterols.
Dielectric barrier discharge ionization has gained attention in the last few years due to its versatility and the vast array of molecules that can be ionized. In this study, we report on the assessment of liquid chromatography coupled to dielectric barrier discharge ionization with mass spectrometry for neutral lipid analysis. A set of different neutral lipid subclasses (triacylglycerides, diacylglycerides, and sterols) were selected for the study. The main species detected from our ionization source were [M-H2O+H](+), [M+H](+) or [M-R-H2O+H](+), attributed to sterol dehydration, protonation or the fragmentation of an acyl chain accompanied by a water loss of the glycerolipids, respectively. In terms of sensitivity, the dielectric barrier discharge displayed overall improved abundances and comparable or better limits of quantitation than atmospheric pressure chemical ionization for both acylglycerols and sterols. As a case study, different archaeological samples with variable content in neutral lipids, particularly triacylglycerides, were studied. The identification was carried out by combining accurate mass and the tentative formula associated with the exact mass, retention time matching with standards, and additional structural information from in-source fragmentation. The high degree of unsaturation and the presence of sterols revealed the potential vegetal origin of the material stored in the analyzed samples.
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