Add time:07/25/2019         Source:sciencedirect.com

Perhydro-1,4-thiazepine-4,5-dicarboxylic acid sulfoxide (Cyclic cystathionine (cas 105990-93-0) sulfoxide [cyclic cystaSO]) and N-acetylperhydro-1,4-thiazepine-3,5-dicarboxylic acid (NAc-cyclic cysta) have been identified in the urine of a patient with cystathioninuria as new metabolites of cystathionine for the first time using liquid chromatography—mass spectrometry with an atmospheric pressure chemical ionization interface system (LC/APCI-MS). The concentrations of cyclic cystaSO and NAc-cyclic cysta in the urine of a patient with cystathioninuria have also been determined for the first time using this method: 18.24 ± 0.79 and 25.23 ± 0.83 mg/g creatinine, respectively.

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