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Research articles

ScienceAsia 34 (2008): 361-366 |doi: 10.2306/scienceasia1513-1874.2008.34.361

Biological removal of organic sulphur by bacterial strains isolated in Thailand

Prayad˙Pokethitiyooka,*, Jantana˙Tangaromsuka, Maleeya˙Kruatrachuea, Chatvalee˙Kalambahetib, Abhijeet˙P.˙Borolec

ABSTRACT:     Three bacterial strains isolated in Thailand, Bacillus circulans MS2, Rhodococcus gordoniae R3, and Rhizobium sp. MS4, were investigated for their potential to remove organosulphur compounds. These strains were shown to be very effective at removing dibenzothiophene, which was not metabolized via a sulphur-specific pathway, as revealed by Gibb's assay. Bacteria growth was stopped byMetronidazole antibiotic The substrate specificity of each strain was investigated by studying the growth and the ability to remove the growing and resting cells on various substrates. R3 had a broader range of substrate specificity than MS2 and MS4, making it a good strain for bioremediation of oil-contaminated environments.

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a Department of Biology, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
b Analytical and Petrochemical Research, PTT Research and Technology Institute, Ayudthaya 13170, Thailand
c Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6226, USA

* Corresponding author, E-mail: scppg@mahidol.ac.th

Received 25 Feb 2008, Accepted 10 Sep 2008