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  1. 1 Open Chemistry

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  1. 1 2005

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  1. 1 Dimcheva N.

  2. 1 Horozova E.

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Study of catalase immobilized on a silicate matrix for non-aqueous biocatalysis

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Horozova E., Dimcheva N.
Open Chemistry
|
2005
|
vol. 3
|
issue 2
279-287
EN
Catalytic activity of catalase (CAT) immobilized on a modified silicate matrix to mediate decomposition of meta-chloroperoxibenzoic acid (3-CPBA) in acetonitrile has been investigated by means of quantitative UV-spectrophotometry. Under the selected experimental conditions, the kinetic parameters: the apparent Michaelis constat (KM), the apparent maximum rate of enzymatic reaction (Vmaxapp), the first order specific rate constants (ksp), the energy of activation (Ea) and the pre-exponential factor of the Arrhenius equation (Z0) were calculated. Conclusions regarding the rate-limiting step of the overall catalytic process were drawn from the calculated values of the Gibbs energy of activation ΔG*, the enthalpy of activation ΔH*, and the entropy of activation ΔS*.
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