Determination of diamine oxidase by a kinetic method with 2,2'-azino-di(3-ethylbenzthiazoline-6-sulfonate) |
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Authors: | Nada Majki?-Singh Milan Konjovi? Marina Stojanov Slavisa Spasi? Ivan Berke? |
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Institution: | Department of Biochemistry, Faculty of Pharmacy, University of Belgrade, Dr. Subotica 8, 11000 Belgrade, P.O. Box 146 Yugoslavia |
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Abstract: | Hydrogen peroxide, the product of diamine oxidase-catalyzed putrescine or cadaverine oxidation, formed in proportion to the enzyme activity, is measured spectrophotometrically by using the above sulfonate (ABTS) and peroxidase. Only one reagent solution containing 3 mmol of putrescine or 10 mmol of cadaverine, 4 mmol of ABTS and 3000 U of peroxidase per litre of 0.2 mol l-1 Tris—0.1 mol l-1 HCl buffer pH 7.5 is needed. Absorbance changes are measured at 410 nm over the first 3 min of the reaction. This initial oxidation rate of the chromogen enables diamine oxidase activity up to 230 U l-1 to be determined. |
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