Enzymatic oxidation of aqueous pentachlorophenol |
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Authors: | E Y Kim H J Chae and K H Chu |
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Institution: | 1. Department of Chemical Engineering,The University of Seoul,Seoul 130-743,Korea 2. Departments of Food and Biotechnology and Innovative Industrial Technology,Hoseo University,Asan 336-795,Korea 3. Honeywell Process Solutions,17 Changi Business Park,Central 1,Singapore 486073 |
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Abstract: | The influence of the nonionic surfactant Tween 80 on pentachlorophenol (PCP) oxidation catalyzed by horseradish peroxidase was studied.The surfactant was tested at concentrations below and above its critical micelle concentration (CMC).Enhancement of PCP removal was observed at sub-CMCs.The presence of Tween 80 in the reaction mixture reduced enzyme inactivation which occurred through a combination of free radical attack and sorption by precipitated products.A simple first-order model was able to simulate time profiles for enzyme inactivation in the presence or absence of Tween 80.At supra-CMCs,the surfactant caused noticeable reductions in PCP removal.presumably through micelle partitioning of PCP which precluded the hydrophobic PCP molecule from interacting with the enzyme. |
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Keywords: | biocatalysis horseradish peroxidase pentachlorophenol surfactant pentachlorophenol aqueous oxidation micelle partitioning hydrophobic molecule simple model able simulate time profiles presence reaction mixture enzyme inactivation combination free radical |
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