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Development of an enzyme assay and preliminary kinetic studies for the enzyme (s) from candida troplicalis RETL-crl involved in phenol

Abdul Rashid, Noor Aini and Ibrahim, Zaharah and C., Fernandez C. and M. Tuah, Piakong (2006) Development of an enzyme assay and preliminary kinetic studies for the enzyme (s) from candida troplicalis RETL-crl involved in phenol. Pakistan Journal of Biological Sciences, 9 (5). pp. 805-809. ISSN 1028-8880

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Official URL: http://www.doaj.org/doaj?func=openurl&issn=1028888...

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
Additional Information:Open access journal (DOAJ)
Uncontrolled Keywords:Enzyme, RETL-Cr1, degradation properties,
Subjects:Q Science > QD Chemistry
Divisions:Science
ID Code:8191
Deposited By: Prof Dr. Noor Aini Abdul Rashid
Deposited On:02 Apr 2009 06:07
Last Modified:12 Nov 2012 01:42

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