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  • Title: Identification of cyclic cystathionine sulfoxide and N-acetylcyclic cystathionine in the urine of a patient with cystathioninuria using liquid chromatography-mass spectrometry with an atmospheric pressure chemical ionization interface system.
    Author: Zhang J, Sugahara K, Sagara Y, Hashimoto K, Masuoka N, Kodama H.
    Journal: Metabolism; 1996 Oct; 45(10):1312-6. PubMed ID: 8843190.
    Abstract:
    Perhydro-1,4-thiazepine-4,5-dicarboxylic acid sulfoxide (cyclic cystathionine 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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