Abstract
A simple method has been developed for the determination of N-acetyl-S-(N-methylcarbamoyl)cysteine in human urine. Treatment of a urine sample (1 ml) with ethanol (2 ml) and potassium carbonate (1.5 g) produces ethyl N-methylcarbamate, which is extracted into ethanol and measured by packed column gas chromatography with nitrogen-sensitive detection. The limit of quantitation in human urine is 1 μg/ml and the between-sample coefficient of variation is 5–11%. Simultaneously, N,N-dimethylformamide, N-methylformamide and formamide can also be determined.
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