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Bioconversion of d-glucose into d-glucosone by immobilized glucose 2-oxidase from Coriolus versicolor at moderate pressures

Paper ID Volume ID Publish Year Pages File Format Full-Text
35371 45088 2011 6 PDF Available
Title
Bioconversion of d-glucose into d-glucosone by immobilized glucose 2-oxidase from Coriolus versicolor at moderate pressures
Abstract

The immobilized glucose 2-oxidase (pyranose oxidase, pyranose:oxygen-2-oxidoreductase, EC 1.1.3.10) from Coriolus versicolor was used to convert d-glucose into d-glucosone at moderate pressures, up to 150 bar, with compressed air in a modified commercial batch reactor. Several parameters affecting biocatalysis at moderate pressures were investigated as follows: pressure, different forms of immobilized biocatalysts, glucose concentration, pH, temperature and the presence of catalase. Glucose 2-oxidase (GOX2) was purified by immobilized metal affinity chromatography on epoxy-activated Sepharose 6B-IDA-Cu(II) column at pH 6.0. Purified enzyme and catalase were immobilized into a polyethersulfone (PES) membrane in the presence of glutaraldehyde and gelatin. Enhancement of the bioconversion of d-glucose was done by the pressure since an increase in the pressure with compressed air increases the conversion rates. The optimum temperature and pH for bioconversion of d-glucose were found to be 62 °C and pH 6.0, respectively and the activation energy (Ea) was 28.01 kJ mol−1. The apparent kinetic constants (V′maxV′max, K′mK′m, K′catK′cat and Kcat/K′mKcat/K′m) for this bioconversion were 2.27 U mg−1 protein, 11.15 mM, 8.33 s−1 and 747.38 s−1 M−1, respectively. The immobilized biomass of C. versicolor as well as crude extract containing GOX2 activity were also useful for bioconversion of d-glucose at 65 bar with a yield of 69.9 ± 3.8% and 91.3 ± 1.2%, respectively. The immobilized enzyme was apparently stable for several months without any significant loss of enzyme activity. On the other hand, this immobilized enzyme was also stable at moderate pressures, since such pressures did not affect significantly the enzyme activity.

Keywords
Biocatalysis at moderate pressures; Immobilized glucose 2-oxidase from Coriolus versicolor; Immobilization in polyethersulfone membranes; Catalase; Bioconversion of d-glucose into d-glucosone; Apparent kinetic constants
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Bioconversion of d-glucose into d-glucosone by immobilized glucose 2-oxidase from Coriolus versicolor at moderate pressures
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 46, Issue 1, January 2011, Pages 168–173
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us