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Quantitative analysis of acyl-lysophosphatidic acid in plasma using negative ionization tandem mass spectrometry

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Bibliographic Details
Title:	Quantitative analysis of acyl-lysophosphatidic acid in plasma using negative ionization tandem mass spectrometry
Authors:	Yoon, Hye-Ran hyeranyoon@yahoo.com, Kim, Hohyun, Cho, Sam-Hyun
Source:	Journal of Chromatography B: Analytical Technologies in the Biomedical & Life Sciences. May2003, Vol. 788 Issue 1, p85. 8p.
Subjects:	Lysophospholipids, Blood testing, Mass spectrometry
Abstract:	Analysis of acyl-lysophosphatidic acids (LPAs) has clinical importance as a potential biomarker for ovarian and other gynecological cancers or obesity from the point of view of prevention. Here we report a simple sample preparation and analytical method with high sensitivity and specificity for the early detection of gynecological cancers to improve the overall outcome of this disease. We established a novel quantification method for acyl-LPAs in plasma by electrospray negative ionization tandem mass spectrometry (MS–MS) using multiple reaction monitoring mode without conventional TLC step. Protein-bound lipids, acyl-LPAs in plasma were extracted with methanol/chloroform (2:1) containing LPA C14:0 as internal standard under acidic conditions. Following back-extraction with chloroform and water, the centrifuged lower phase was evaporated and reconstituted in methanol and then analyzed. Using ESI-MS–MS with negative ionization MRM mode, all the species of LPAs were completely separated from plasma matrix without severe interference. For MRM mode, Q1 ions selected were m/z 409, 433, 435, 437 and 457 which corresponds to molecular mass [M-H]− of C16:0, C18:2, C18:1, C18:0 and C20:4 LPA, respectively. Q2 ions selected for MRM was m/z 79, phosphoryl product. Using MS–MS with MRM mode, all the species of LPAs were completely separated from plasma matrix without severe interference. This method allowed simultaneous detection and quantification of different species of LPAs in plasma over a linear dynamic range of 0.01–25 μmol/l. The method detection limit was 0.3 pmol/ml with correlation coefficient of 0.9983 in most LPAs analyzed. When applied to plasma from normal and gynecological cancer patients, this new method differentiated two different groups by way of total LPA level. [Copyright &y& Elsevier]
	Copyright of Journal of Chromatography B: Analytical Technologies in the Biomedical & Life Sciences is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database:	Engineering Source

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