title: Measurement of biological disulfides by postcolumn sulfitolysis following separation by HPLC.
abstract: We developed a method to measure disulfides which is applicable to biological fluids. It consisted of two parts. First, certain thiols and disulfides were separated by HPLC. Second, the eluted materials were submitted to postcolumn reaction with 2-nitro-5-thiosulfobenzoate in the presence of sulfite. The resultant yellow product, 2-nitro-5-thiobenzoate, was measured by its absorbance at 412 nm. We determined the elution characteristics of the thiols and disulfides derived from cysteine, glutathione, alpha-mercaptopropionylglycine (Thiola), and cysteamine. Penicillamine and its disulfide did not react. Cystine in the urine of 22 cystinuric patients, measured by this method, was compared with results obtained by automatic amino acid analysis.
authors.affiliation: Division of Clinical Biochemistry, McGill University Clinic, Royal Victoria Hospital, Montreal, Quebec, Canada.
authors.forename: J C
authors.initials: JC
authors.lastname: Crawhall
authors.forename: D
authors.initials: D
authors.lastname: Kalant
mesh_terms: D002851:Chromatography, High Pressure Liquid; D003555:Cystinuria / Q000652:urine; D004220:Disulfides / Q000032:analysis* / Q000652:urine; D006801:Humans; D009579:Nitrobenzoates; D013438:Sulfhydryl Compounds / Q000032:analysis* / Q000652:urine
chemical_list: D004220:Disulfides; D009579:Nitrobenzoates; D013438:Sulfhydryl Compounds; C041724:2-nitro-5-thiosulfobenzoic acid