Author:
Bhatti H N,Madeeha M,Asgher M,Batool N
Abstract
An intracellular glucose oxidase (GOD) was isolated from the mycelium extract of a locally isolated strain of Aspergillus niger NFCCP. The enzyme was partially purified to a yield of 28.43% and specific activity of 135 U mg–1through ammonium sulfate precipitation, anion-exchange chromatography, and gel filtration. The enzyme showed high specificity for D-glucose, with a Kmvalue of 25 mmol L–1. The enzyme exhibited optimum catalytic activity at pH 5.5. Optimum temperature for GOD-catalyzed D-glucose oxidation was 40 °C. The enzyme displayed a high thermostability having a half-life (t1/2) of 30 min, enthalpy of denaturation (H*) of 99.66 kJ mol–1, and free energy of denaturation (G*) of 103.63 kJ mol–1. These characteristics suggest that GOD from A. niger NFCCP can be used as an analytical reagent and in the design of biosensors for clinical, biochemical, and diagnostic assays.Key words: glucose oxidase, Aspergillus niger, kinetics, thermodynamics, thermal stability.
Publisher
Canadian Science Publishing
Subject
Genetics,Molecular Biology,Applied Microbiology and Biotechnology,General Medicine,Immunology,Microbiology
Cited by
28 articles.
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