Glucose oxidase catalyses the reduction of O2 to H2O2 in the presence of irradiated TiO2 and isopropyl alcohol

Catalytic amounts of glucose oxidase from Aspergillus niger (GO) are active in the reduction of O2 to H2O2 in the presence of irradiated suspensions of TiO2 and isopropyl alcohol as electron donor. An explanation of this behaviour is given on the basis of the ability of the enzyme to capture electro...

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Bibliographic Details
Published in:Photochemical & photobiological sciences 2002-12, Vol.1 (12), p.951-954
Main Authors: Ganadu, Maria L, Andreotti, Leonardo, Vitali, Irene, Maldotti, Andrea, Molinari, Alessandra, Mura, Giovanni M
Format: Article
Language:English
Subjects:
2-Propanol - chemistry
Aspergillus - enzymology
Catalysis
Electron Spin Resonance Spectroscopy
Glucose Oxidase - chemistry
Hydrogen Peroxide - chemical synthesis
Oxidation-Reduction
Oxygen - chemistry
Photochemistry - methods
Photosensitizing Agents - chemistry
Spin Trapping
Time Factors
Titanium - chemistry
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Summary:Catalytic amounts of glucose oxidase from Aspergillus niger (GO) are active in the reduction of O2 to H2O2 in the presence of irradiated suspensions of TiO2 and isopropyl alcohol as electron donor. An explanation of this behaviour is given on the basis of the ability of the enzyme to capture electrons from the photoexcited TiO2 instead of its natural substrate, glucose. This process has a marked positive effect on both the oxidation of isopropyl alcohol to acetone and the formation of radical intermediates, which have been detected, for the first time, by EPR-spin trapping investigation.
ISSN:1474-905X
1474-9092
DOI:10.1039/b109953c