title: Quantitative gas chromatographic mass spectrometric determination of mandelic acid in blood plasma. Comparison of deuterated and homologous internal standards.
abstract: Quantitative gas chromatography/mass spectrometry/selected ion monitoring of mandelic acid in plasma in the lower micromolar range has been investigated using both the deuterated compound and a homologue, 2-phenyllactic acid, as internal standards. On chromatography of the TMSi-ester ethers, the latter is less stable than the former. The chromatographic isotope effect observed for deuterated mandelic acid does not suggest a carrier function for this compound. Normal plasma levels of mandelic acid are about 0.5 microM. Only a minor portion of phenyramidol is metabolized to mandelic acid. Preliminary in vivo data indicate the presence of a stereoselective transport system for D(-)-mandelic acid in gastrointestinal tract and possibly kidney.
mesh_terms: D000328:Adult; D001692:Biological Transport; D003903:Deuterium; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D008333:Mandelic Acids / Q000097:blood*; D013237:Stereoisomerism
chemical_list: D008333:Mandelic Acids; D003903:Deuterium; C037938:mandelic acid