Effective Liquid Chromatography-Trapped Ion Mobility Spectrometry-Mass Spectrometry Separation of Isomeric Lipid Species
| Autor: | Russell L Lewis, Timothy J. Garrett, Cesar E. Ramirez, Francisco Fernandez-Lima, Kevin Jeanne Dit Fouque, Richard A. Yost, Jeremy P. Koelmel |
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| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Chromatography Double bond 010401 analytical chemistry 010402 general chemistry Mass spectrometry 01 natural sciences Glycerylphosphorylcholine Mass Spectrometry 0104 chemical sciences Analytical Chemistry Ion Diglycerides Ion-mobility spectrometry–mass spectrometry chemistry Isomerism Human plasma Acyl chain Molecule lipids (amino acids peptides and proteins) Diacylglycerol kinase Chromatography Liquid |
| Zdroj: | Analytical chemistry. 91(8) |
| ISSN: | 1520-6882 |
| Popis: | Lipids are a major class of molecules that play key roles in different biological processes. Understanding their biological roles and mechanisms remains analytically challenging due to their high isomeric content (e.g., varying acyl chain positions and/or double bond locations/geometries) in eukaryotic cells. In the present work, a combination of liquid chromatography (LC) followed by high resolution trapped ion mobility spectrometry-mass spectrometry (TIMS-MS) was used to investigate common isomeric glycerophosphocholine (PC) and diacylglycerol (DG) lipid species from human plasma. The LC dimension was effective for the separation of isomeric lipid species presenting distinct double bond locations or geometries but was not able to differentiate lipid isomers with distinct acyl chain positions. High resolution TIMS-MS resulted in the identification of lipid isomers that differ in the double bond locations/geometries as well as in the position of the acyl chain with resolving power ( R) up to ∼410 ( R ∼ 320 needed on average). Extremely small structural differences exhibiting collision cross sections (CCS) of less than 1% (down to 0.2%) are sufficient for the discrimination of the isomeric lipid species using TIMS-MS. The same level of performance was maintained in the complex biological mixture for the biologically relevant PC 16:0/18:1 lipid isomers. These results suggest several advantages of using complementary LC-TIMS-MS separations for regular lipidomic analysis, with the main emphasis in the elucidation of isomer-specific lipid biological activities. |
| Databáze: | OpenAIRE |
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