Abstract
The concentrations of urinary phenylacetic, m- and p-hydroxyphenylacetic, mandelic (MA), p-hydroxymandelic, indoleacetic, homovanillic, vanillylmandelic, 5-hydroxyindoleacetic and 3,4-dihydroxyphenylacetic (DOPAC) acids and 3-methoxy-4-hydroxyphenylethyleneglycol (MHPG) and the concentrations of the above plasma acids (except MA, MHPG and DOPAC) were determined by gas chromatography—mass spectrometry with selected-ion monitoring at the time of receipt of the samples and after three, six and nine months storage at -18°C. The samples were not treated in any way before storage. The concentrations of most of the urinary metabolites declined significantly (analysis of variance) over the nine-month storage period, whereas most of the plasma metabolites did not.
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