Abstract
1. (1) 2,4-Dimethyladipic acid was first identified in normal human urine using gas chromatography-mass spectrometry. Urinary excretion of 2,4-dimethyl-adipic acid in 7 healthy adults ranged from 4.9 μmol to 14 μumol per 24 h. 2. (2) Succinic acid, adipic acid, 3-methyladipic acid, 2,4-dimethyladipic acid, pimelic acid and azelaic acid were identified in the ultrafiltrate of the blood obtained from a chronic uremic patient using a hemodialyzer. 3. (3) Levels of succinic acid, adipic acid, 3-methyladipic acid, 2,4-dimethyl-adipic acid, pimelic acid and azelaic acid in uremic serum were determined using a mass fragmentographic technique. Concentration of succinic acid in uremic serum was comparable to that in normal serum, whereas concentrations of adipic acid, 3-methyladipic acid, 2,4-dimethyladipic acid, pimelic acid and azelaic acid were highly elevated in uremic serum.
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