1. Mass spectrometric analysis of platelet-activating factor after isolation by solid-phase extraction and direct derivatization with pentafluorobenzoic anhydride.
- Author
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Weintraub ST, Satsangi RK, Sprague EA, Prihoda TJ, and Pinckard RN
- Subjects
- Anhydrides chemistry, Benzoates chemistry, Cells, Cultured, Endothelium, Vascular cytology, Endothelium, Vascular drug effects, Endothelium, Vascular metabolism, Gas Chromatography-Mass Spectrometry, Humans, Indicators and Reagents, Mass Spectrometry, Platelet Activating Factor chemistry
- Abstract
Platelet-activating factor is the term used to denote a class of extremely potent lipid mediators that consist predominantly of 1-O-alkyl- and 1-O-acyl-2-acetyl-sn-glycero-3-phosphocholines. A method has been devised for rapid isolation of these acetylated phospholipids by solid-phase extraction prior to direct derivatization with pentafluorobenzoic anhydride and analysis by gas chromatography (GC)/electron-capture mass spectrometry. Recovery through the entire method (lipid isolation, derivatization, and purification) typically ranged from 70% to 85%. Using the direct derivatization procedure described here, the practical limit of detection for each of the standard alkyl- and acyl-platelet-activating factor homologs was 1 fmol injected into the GC. Results from the application of the method to the analysis of alkyl and acyl homologs of platelet-activating factor isolated from stimulated human umbilical vein endothelial cells are presented, exhibiting excellent accuracy and precision for a wide range of tissue levels of this class of potent autacoids.
- Published
- 2000
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