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标题：An improved assay for platelet-activating factor using HPLC-tandem mass spectrometry
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作者：John S. Owen ; Robert L. Wykle ; Michael P. Samuel 等
期刊名称：JLR Papers In Press
印刷版ISSN：0022-2275
电子版ISSN：1539-7262
出版年度：2005
卷号：46
期号：02
页码：373-382
DOI：10.1194/jlr.D400029-JLR200
出版社：American Society for Biochemistry and Molecular Biology
摘要：We describe an improved assay for platelet-activating factor (PAF; 1-O-alkyl-2-acetyl-sn-glycero-3-phosphocholine) using HPLC-tandem mass spectrometry (LC-MS/MS). The present method can readily detect as little as 1 pg (1.9 fmol) of PAF, a significant improvement over previously described LC-MS/MS methods, and gives a linear response up to 1,000 pg of PAF. Our method also overcomes the artifacts from isobaric lipids that have limited the usefulness of certain existing LC-MS/MS assays for PAF. In the course of these studies, we detected three novel lipid species in human neutrophils. One of the novel lipids appears to be a new molecular species of PAF, and the other two have chromatographic and mass spectrometric properties consistent with stearoyl-formyl-glycerophosphocholine and oleoyl-formyl-glycerophosphocholine. These observations identify previously unknown potential interferences in the measurement of PAF by LC-MS/MS. Moreover, our data suggest that the previously described palmitoyl-formyl-glycerophosphocholine is not unique but rather is a member of a new and poorly understood family of formylated lipids. Abbreviations: d3-16:0 PAF, 1-O-hexadecyl-2-[2H3]acetyl-glycerophosphocholine; fMLP, N-formyl-methionyl-leucyl-phenylalanine; GPC, sn-3-glycerophosphocholine; LC-MS, high-performance liquid chromatography-mass spectrometry; LC-MS/MS, high-performance liquid chromatography-tandem mass spectrometry; lysoPC, lysophosphatidylcholine; MRM, multiple reaction monitoring; PAF, platelet-activating factor; PFPC, palmitoyl-formyl-glycerophosphocholine; PMN, polymorphonuclear neutrophil
关键词：high-performance liquid chromatography tandem mass spectrometry • trace analysis • neutrophil