Simultaneous clinical monitoring of lactic acid, pyruvic acid and ketone bodies in plasma as methoxime/tert-butyldimethylsilyl derivatives by gas chromatography-mass spectrometry in selected ion monitoring mode

Simultaneous determination of lactic acid, pyruvic acid, 3‐hydroxybutyric acid and acetoacetic acid for clinical monitoring of lactic acidosis and ketone body formation in human plasma (20 µL) was performed by gas chromatography–mass spectrometry in selected ion monitoring (SIM) mode after generatin...

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Published in:Biomedical chromatography 2008-05, Vol.22 (5), p.450-453
Main Authors: Paik, Man-Jeong, Cho, Eun-Young, Kim, Hoon, Kim, Kyoung-Rae, Choi, Sangdun, Ahn, Young-Hwan, Lee, Gwang
Format: Article
Language:English
Subjects:
Gas Chromatography-Mass Spectrometry - methods
gas chromatography-mass spectrometry in selected ion monitoring mode
Humans
Ketone Bodies - blood
Ketone Bodies - chemistry
ketone body
Lactic Acid - blood
Lactic Acid - chemistry
lactic acidosis
Male
methoximation
Organosilicon Compounds - chemistry
Oximes - chemistry
plasma
Pyruvic Acid - blood
Pyruvic Acid - chemistry
Reproducibility of Results
tert-butyldimethylsilylation
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Summary:Simultaneous determination of lactic acid, pyruvic acid, 3‐hydroxybutyric acid and acetoacetic acid for clinical monitoring of lactic acidosis and ketone body formation in human plasma (20 µL) was performed by gas chromatography–mass spectrometry in selected ion monitoring (SIM) mode after generating methoxime/tert‐butyldimethylsilyl derivatives. All of the targeted carboxylic acids were detected by characteristic fragment ions, which permitted sensitive and selective identification in the presence of co‐extracted free fatty acids and other acidic metabolites at much higher levels. The method was linear (r ≥ 0.9991), reproducible (% relative standard deviation = 1.2–5.8), and accurate (% relative error = −7.2–7.6), with detection limits of 0.05–1.7 ng/mL. This rapid, accurate and selective method using minimal plasma samples (20 µL) is useful in the clinical monitoring of lactic acidosis and ketone body formation in plasma. Copyright © 2008 John Wiley & Sons, Ltd.
ISSN:0269-3879
1099-0801
DOI:10.1002/bmc.966