Development of methods of the gas chromatographic determination of phenylcarboxylic acids in blood serum and their adaptation to clinical laboratory conditions

Abstract

A method has been developed for the determination of phenylcarboxylic acids (benzoic, p� hydroxyphenyllactic, phydroxyphenylacetic, phenyllactic, 3�phenylpropanoic, and phenylacetic) in blood serum by gas chromatography with a flameionization detector ( FID). The quantitative characteristics of analysis obtained with the FID and mass spectrometric detectors are in the same range and exhibit common trends for different groups of samples. It has been shown that the reproducibility of the results increases with the addition of a stage of salting out to the sample preparation procedure. The accuracy of the results is esti� mated using the added-found method. A possibility of the application of widely used FID to the quantitative determination of phenylcarboxylic acids in blood serum has been demonstrated for routine clinical practice.