title: Laccase from Coriolus hirsutus as alternate label for enzyme immunoassay. Determination of pesticide 2,4-dichlorophenoxyacetic acid.
abstract: A new label--laccase from the fungus Coriolus hirsutus--was applied for solid-phase enzyme-linked immunosorbent assays of the pesticide 2,4-dichlorophenoxyacetic acid (2,4-D). Two proposed assays are based on (1) competitive binding of antibody-laccase conjugate with immobilized 2,4-D-protein conjugate and 2,4-D in tested sample, and (2) competition of 2,4-D and 2,4-D-laccase conjugate for binding with immobilized antibodies. Kinetic and concentration dependencies for these reactions were studied, and the ELISAs were optimized in accordance with the data obtained. The elaborated systems permit the detection of 2,4-D in concentrations down to 10-20 ng/mL; time of the assays is 1.5-2 h. The main advantage of the laccase label, in comparison with the widely used peroxidase one, lies in the lack of hydrogen peroxide from substrate mixture, because dissolved oxygen plays the role of oxidizer.
authors.affiliation: A. N. Bach Institute of Biochemistry, Russian Academy of Sciences, Moscow, Russia.
authors.forename: A V
authors.initials: AV
authors.lastname: Zherdev
authors.forename: N A
authors.initials: NA
authors.lastname: Bizova
authors.forename: A I
authors.initials: AI
authors.lastname: Yaropolov
authors.forename: N V
authors.initials: NV
authors.lastname: Lyubimova
authors.forename: O V
authors.initials: OV
authors.lastname: Morozova
authors.forename: B B
authors.initials: BB
authors.lastname: Dzantiev
mesh_terms: D015084:2,4-Dichlorophenoxyacetic Acid / Q000032:analysis* / Q000276:immunology; D000937:Antigen-Antibody Reactions; D001487:Basidiomycota / Q000201:enzymology*; D002384:Catalysis; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods*; D004800:Enzymes, Immobilized / Q000737:chemistry / Q000378:metabolism*; D006540:Herbicides / Q000032:analysis* / Q000276:immunology; D042845:Laccase; D010088:Oxidoreductases / Q000737:chemistry / Q000378:metabolism*; D012680:Sensitivity and Specificity
chemical_list: D004800:Enzymes, Immobilized; D006540:Herbicides; D015084:2,4-Dichlorophenoxyacetic Acid; D010088:Oxidoreductases; D042845:Laccase