title: Inhibition of peroxidase-catalyzed oxidation of 3,3 ,5,5 -tetramethylbenzidine by aminophenols.
abstract: Peroxidase-catalyzed oxidation of 3,3 ,5,5 -tetramethylbenzidine (TMB) was inhibited by o-aminophenol (AP), 2-amino-4-tert-butylphenol (ATBP), 2-amino-4,6-di-tert-butylphenol (ADTBP), and 4-tert-butylpyrocatechol (TBP). Inhibitors were characterized by inhibition constant K(i) and stoichiometric coefficient f, the number of radicals terminated by one inhibitor molecule. The most efficient inhibitor is ADTBP characterized by K(i) = 36 microM in 0.015 M phosphate citrate buffer, pH 6.0, at 20 degrees C. According to their antiradical efficiency, the studied inhibitors can be arranged as follows: ADTBP > ATBP > AP > TBP. The role of the NH(2) group in the inhibitory capacity of aminophenols is discussed. Using gas-liquid chromatography, kinetics of consumption of the initial components and accumulation of the reaction products on peroxidase-catalyzed oxidation of the TMB-TBP pair was studied; the data clarify the stages of a complex process of co-oxidation of amines and phenols.
authors.affiliation: Institute of Bioorganic Chemistry, National Academy of Sciences of Belarus, ul. Akademika Kuprevicha 5/2, Minsk 220141, Belarus.
authors.forename: I V
authors.initials: IV
authors.lastname: Naumchik
authors.forename: E I
authors.initials: EI
authors.lastname: Karasyova
authors.forename: D I
authors.initials: DI
authors.lastname: Metelitza
authors.forename: I P
authors.initials: IP
authors.lastname: Edimecheva
authors.forename: V L
authors.initials: VL
authors.lastname: Sorokin
authors.forename: O I
authors.initials: OI
authors.lastname: Shadyro
mesh_terms: D000627:Aminophenols / Q000494:pharmacology*; D000975:Antioxidants / Q000032:analysis; D001560:Benzidines / Q000378:metabolism*; D002396:Catechols / Q000494:pharmacology; D002849:Chromatography, Gas; D006735:Horseradish Peroxidase / Q000037:antagonists & inhibitors*; D007700:Kinetics; D010084:Oxidation-Reduction / Q000187:drug effects
chemical_list: C503304:2-amino-4,6-di-tert-butylphenol; D000627:Aminophenols; D000975:Antioxidants; D001560:Benzidines; D002396:Catechols; C027667:2-aminophenol; C038096:tert-butylcatechol; C503303:2-amino-4-tert-butylphenol; C021758:3,3',5,5'-tetramethylbenzidine; D006735:Horseradish Peroxidase