| Abstrakt: |
In the present study, free fatty acids (FFAs, including palmitic acid, stearic acid, oleic acid, linoleic acid and arachidonic acid) in rabbit plasma were determined by gas chromatography-mass spectrometry (GC-MS) after trimethylsilylation derivatization using N,O-bis(trimethylsilyl)trifluoroacetamide (BSTFA) -- trimethylchlorosilane (TMCS) as derivatization reagent. The experimental conditions, including extraction and silylation reaction, were investigated. The method was experimentally validated. The linearity between fatty acids' peak areas and their concentrations was obtained with the corelative coefficient (r²) all more than 0.999, and the recoveries were between 82% and 111%. The intra-day variations of FFAs' in plasma samples at different concentrations were all less than 6%. FFA analysis results of 16 rabbit plasma samples showed that the method could be well applied in the determination of plasma samples in vivo. In contrast to the traditional method of FFA derivatization, the established trimethylsilylation method presented simplicity, high specificity, and completely free from the interference of the esterified fatty acid, such a s triacylglyceride. The method could be applied for analyzing FFA profiles in the clinical laboratory or pharmacological research. [ABSTRACT FROM AUTHOR] |
