Paik MJ, Yu J, Hu MB, Kim SJ, Kim KR, Ahn YH, Choi S, Lee G. Gas chromatographic-mass spectrometric analyses of cholesterol and its precursors in rat plasma as tert-butyldimethylsilyl derivatives.
Clin Chim Acta 2008;
396:62-5. [PMID:
18657530 DOI:
10.1016/j.cca.2008.06.025]
[Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2008] [Revised: 06/28/2008] [Accepted: 06/30/2008] [Indexed: 10/21/2022]
Abstract
BACKGROUND
Cholesterol and its metabolic precursors occurring in metabolic pathways are important biochemical indicators in pathological conditions.
METHODS
A method for the simultaneous determination of cholesterol and its metabolic precursors, such as lanosterol and 7-dehydrocholesterol, in rat plasma is demonstrated. It involves their extraction after saponification, followed by conversion to tert-butyldimethylsilyl (TBDMS) derivatives for analysis by gas chromatography-mass spectrometry (GC-MS) in selected ion monitoring (SIM) mode (GC-SIM-MS).
RESULTS
The characteristic fragment ions of [M-57], m/z 443, 483, and 441 permitted the accurate and selective detection of cholesterol and its precursors in rat plasma. The whole procedure of TBDMS derivatization, with subsequent GC-SIM-MS analysis, was linear (r>or=0.9994), reproducible (% relative standard deviation=2.2 to 7.5), and accurate (% relative error=-5.6 to 7.7), with detection limits of 0.02 to 0.07 ng/ml. Recoveries were measured to be ranged from 89.5 to 95.4%.
CONCLUSION
The present method was useful for the quantification of cholesterol and its precursors in rat plasma samples of 1 microl.
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