Abstract
Chloroperoxidase (CPO) from Caldariomyces fumago is a versatile enzyme able to catalyze the styrene epoxidation. However, the lack of long-term operational stability is the principal drawback for the industrial applications of this enzyme. In this work, in order to increase the enzyme operational stability, CPO immobilization in TiO2 mesoporous materials was studied. Enzyme immobilization onto two TiO2 supports was assayed: microstructured TiO2 anatase (TiO2AN) and nanostructured TiO2 nanotubes (TiO2NT). The CPO/TiO2NT preparation showed 15-times higher catalytic activity for styrene epoxidation than the free enzyme, showing an excellent performance during the styrene epoxidation. In addition, the total turnover numbers for styrene epoxidation, for the free and immobilized enzyme were determined. The CPO immobilization in TiO2 materials increased the operational stability of CPO in 51 % in the case TiO2AN and 69 % for TiO2NT support. These results clearly show that CPO immobilization onto TiO2NT support significantly enhances the CPO enzymatic epoxidation of styrene.
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