title: Highly sensitive spectrofluorimetric determination of L-cysteine based on inhibition of hemoglobin.
abstract: A highly sensitive spectrofluorimetric method for the determination of L-cysteine based on its inhibitory action on hemoglobin (Hb) activity was developed. The optimal conditions were studied. A linear calibration graph was obtained over the range 2.00 x 10(-7)-1.50 x 10(-6) mol l(-1) for L-cysteine. The relative standard derivation was 1.30% at L-cysteine concentration of 8.00 x 10(-7) mol l(-1) (n=11). Further experimental results revealed that the inhibition of L-cysteine on this system was of the competitive type. The method was applied to determine L-cysteine in protein hydrolysate and cystine electrolyte samples with satisfactory results.
authors: Department of Chemistry, Wuhan University, Wuhan 430072, China.
authors: Chen
authors: C
authors: Yahong
authors: Cai
authors: C
authors: Ruxiu
mesh_terms: D000818:Animals; D002417:Cattle; D003545:Cysteine / Q000032:analysis* / Q000378:metabolism; D006454:Hemoglobins / Q000037:antagonists & inhibitors*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D013050:Spectrometry, Fluorescence; D013997:Time Factors
chemical_list: D006454:Hemoglobins; D003545:Cysteine