title: Spectrofluorimetic determination of cysteine based on the fluorescence inhibition of Cd(II)-8-hydroxyquinoline-5-sulphonic acid complex by cysteine.
abstract: A spectrofluorimetric method for the determination of cysteine at trace and ultra trace levels (0-1.82 x 10(-5) mol l(-1)) has been developed. It is based on the efficient inhibition action of cysteine on the fluorescent system of Cd(II)-8-hydroxyquinoline-5-sulphonic acid complex (Cd(II)-HQS) (lambda(ex) 364.8 nm, lambda(em) 510.4 nm) solution at pH 8.5. The method has been applied to protein hydrolysate and cystine electrolyte samples.
authors.affiliation: Department of Chemistry, Wuhan University, Wuhan, People's Republic of China.
authors.forename: H
authors.initials: H
authors.lastname: Wang
authors.forename: W S
authors.initials: WS
authors.lastname: Wang
authors.forename: H S
authors.initials: HS
authors.lastname: Zhang