General Information
    • ISSN: 2010-0264
    • Frequency: Bimonthly (2010-2014); Monthly (Since 2015)
    • DOI: 10.18178/IJESD
    • Editor-in-Chief: Prof. Richard Haynes
    • Executive Editor: Ms. Nancy Y. Liu
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Editor-in-chief
The University of Queensland, Australia
It is my honor to be the editor-in-chief of IJESD. The journal publishes good papers in the field of environmental science and development.
IJESD 2012 Vol.3(3): 283-288 ISSN: 2010-0264
DOI: 10.7763/IJESD.2012.V3.232

Biodegradation of Dimethyl Phthalate, Diethyl Phthalate, Dibutyl Phthalate and Their Mixture by Variovorax Sp

B. Prasad and S. Suresh

Abstract—Biodegradation of dimethyl phthalate (DMP), diethyl phthalate (DEP) and dibutyl phthalate (DBP) and their mixture by a bacterial strain is reported. The strain was isolated by enrichment technique from garbage dumped soil nearby Indian Institute of Technology Bombay. The isolate had the ability to utilize mixture of DMP, DEP and DBP in the growth medium as well as the individual phthalate esters as the sole source of carbon and energy. The bacterial isolate was identified as Variovorax sp. based on 16S r-DNA sequence analysis. Variovorax sp. degraded >99% of 300 mg/l of DMP, DEP, DBP or a mixture containing 100 mg/l of each within 30 h. Metabolites or end products were not detected by HPLC analyses. Biodegradation of phthalate esters followed first-order kinetics. The rates of biodegradation of individual esters followed the order: DEP>DBP>DMP while in the mixture, rates followed the order: DEP>DMP>DBP. Crude cell free extracts prepared from bacterial isolates contained cocktail of inducible enzymes responsible for the degradation of DMP or DEP.

Index Terms—Biodegradation, enzyme, phthalate esters, variovorax

B. Prasad and S. Suresh are with the Centre for Environmental Science and Engineering (CESE) at the Indian Institute of Technology Bombay (IITB), Powai, Mumbai, India. (e-mails: sumathis@iitb.ac.in;bablup@iitb.ac.in)

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Cite: B. Prasad and S. Suresh, "Biodegradation of Dimethyl Phthalate, Diethyl Phthalate, Dibutyl Phthalate and Their Mixture by VariovoraxSp," International Journal of Environmental Science and Development vol. 3, no. 3, pp. 283-288, 2012.

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