title: Use of trinitrophenylation for quantification of protease and peptidase activities.
abstract: A sensitive and precise method for quantifying protease and peptidase activities is suggested. N-Terminal amino groups of peptides which are formed during hydrolysis of the substrates react with trinitrobenzenesulfonic acid (TNBS), and the trinitrophenyl (TNP) derivatives are determined spectrophotometrically. Spontaneous hydrolysis of TNBS is considerably diminished on trinitrophenylation at pH 7.4 rather than at pH 9-10 as is usually used. The trinitrophenylation method can be used to determine the initial rate of hydrolysis and the kinetics of reactions catalyzed by proteases and peptidases.
authors.affiliation: State Research Center for Applied Microbiology, Ministry of Health of the Russian Federation, Obolensk, Moscow Region, 142279, Russia. center@gncpm.serpukhov.su
authors.forename: V I
authors.initials: VI
authors.lastname: Surovtsev
authors.forename: T V
authors.initials: TV
authors.lastname: Fjodorov
authors.forename: A N
authors.initials: AN
authors.lastname: Baydus
authors.forename: M A
authors.initials: MA
authors.lastname: Borozdina
authors.forename: V V
authors.initials: VV
authors.lastname: Gusev
authors.forename: V P
authors.initials: VP
authors.lastname: Chuprunov
mesh_terms: D000818:Animals; D002417:Cattle; D002918:Chymotrypsin / Q000737:chemistry / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D007700:Kinetics; D008555:Melitten / Q000737:chemistry / Q000378:metabolism; D012710:Serum Albumin, Bovine / Q000737:chemistry / Q000378:metabolism; D014301:Trinitrobenzenes / Q000737:chemistry*; D014302:Trinitrobenzenesulfonic Acid / Q000737:chemistry*
chemical_list: D014301:Trinitrobenzenes; D008555:Melitten; D012710:Serum Albumin, Bovine; D014302:Trinitrobenzenesulfonic Acid; D002918:Chymotrypsin