title: [Simple rapid test with carbonate/nitroprusside for the semiquantitative determination of cysteine in the urine--possible use for control of ascorbic acid therapy in cystine urolithiasis].
abstract: In this paper a method of semiquantitative cysteine determination is presented, which is based on the formation of a red cysteine-Na-nitroprusside salt. The method is a suitable rapid test for checking the process of ascorbic acid therapy in cystinuria and cystine urolithiasis patients. It guarantees acceptable reproducibility of values and can be easily carried out in every clinicochemical laboratory. With the K2CO3/nitroprusside test described and an additional cystine rapid test (Ni2+/S2O4(2-) tablet reagency) a separate semiquantitative differentiation of cysteine and cystine in fresh (!) urine is possible.
authors: Klinik und Poliklinik für Urologie, Friedrich-Schiller-Universität, Jena, GDR.
authors: W
authors: W
authors: Berg
authors: O
authors: O
authors: Kilian
authors: P
authors: P
authors: Brundig
mesh_terms: D001205:Ascorbic Acid / Q000627:therapeutic use; D002254:Carbonates; D003545:Cysteine / Q000652:urine*; D003555:Cystinuria / Q000175:diagnosis* / Q000188:drug therapy; D005292:Ferricyanides; D006801:Humans; D009599:Nitroprusside; D011188:Potassium; D014545:Urinary Calculi / Q000188:drug therapy
chemical_list: D002254:Carbonates; D005292:Ferricyanides; D009599:Nitroprusside; C037593:potassium carbonate; D003545:Cysteine; D001205:Ascorbic Acid; D011188:Potassium
vernacular_title: Einfacher Schnelltest mit Karbonat/Nitroprussid zur semiquantitativen Bestimmung von Zystein im Urin--Möglichkeit einer Verlaufskontrolle unter Askorbinsäuretherapie beim Zystinsteinleiden.