Development of an enzyme assay and preliminary kinetic studies for the enzyme(s) from Candida tropicalis RETL-Cr1 involved in phenol degradation

Christine Cheryl Fernandez, and Noor Aini Abdul Rashid, and Zaharah Ibrahim, and Piakong Mohd Tuah, (2006) Development of an enzyme assay and preliminary kinetic studies for the enzyme(s) from Candida tropicalis RETL-Cr1 involved in phenol degradation. Pakistan Journal of Biological Sciences, 9. pp. 805-809. ISSN 1028-8880

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Abstract

In this study, RETL-Cr1 was studied for its growth and degradation properties in M3 and modified Ramsay media and in the latter with varying saline concentrations. There was no significant effect of medium salinity towards the growth and degradation of phenol in RETL-Cr1. From the growth profile, μ was calculated to be 0.288 h-1 while td was 2.971 h. The significantly higher intracellular enzyme activity of the crude extract was assayed against varying pHs, ethylenediaminetetraacetic acid (EDTA) concentrations, temperatures and Nicotinamide adenine Dinucleotide (NADH) concentrations, in that order with the resulting optimized conditions of pH 6.5, 1.8 mM EDTA, 37°C and 0.4 mM NADH. Enzyme stability was assayed against varying pH and temperature where it was most stable at pH 6.5 and between temperatures ranging from 25 and 30°C. The crude phenol degrading enzyme was further subjected to kinetic studies at the optimized conditions to determine its affinity towards phenol at varying concentrations. From the Lineweaver-Burk plot it was found that the crude enzyme has a high Vmax value of 4.963 μM phenol degraded per minute and a low Km value of 2.115 μM suggesting high affinity towards the substrate. Confirmation of phenol degradation intermediate was determined upon the presence of catechol via thin layer chromatography.

Item Type: Article
Uncontrolled Keywords: phenol degradation, candida tropicalis, enzyme assay, Km2, Vmg
Subjects: Q Science > QR Microbiology
Divisions: FACULTY > Faculty of Science and Natural Resources
Depositing User: Munira
Date Deposited: 22 Mar 2018 03:39
Last Modified: 22 Mar 2018 03:39
URI: http://eprints.ums.edu.my/id/eprint/19361

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