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Appl Environ Microbiol, June 1998, p. 2327-2331, Vol. 64, No. 6
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Desulfurization of Dibenzothiophene and Diesel Oils by a Newly Isolated Gordona Strain, CYKS1

Sung-Keun Rhee, Je Hwan Chang, Yong Keun Chang,* and Ho Nam Chang

BioProcess Engineering Research Center and Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 373-1, Kusong-dong, Yusung-gu, Taejon 305-701, Korea

Received 9 January 1998/Accepted 30 March 1998

A dibenzothiophene (DBT)-desulfurizing bacterial strain was isolated and identified as Gordona strain CYKS1. Strain CYKS1 was found to transform DBT to 2-hydroxybiphenyl via the 4S pathway and to be able to also use organic sulfur compounds other than DBT as a sole sulfur source. Its desulfurization activity was susceptible to sulfate repression. Active resting cells for desulfurization could be prepared only in the early growth phase. When two types of diesel oils, middle distillate unit feed (MDUF) and light gas oil (LGO) containing various organic sulfur compounds including DBT, were treated with resting cells of strain CYKS1 for 12 h, the total sulfur content significantly decreased, from 0.15% (wt/wt) to 0.06% (wt/wt) for MDUF and from 0.3% (wt/wt) to 0.25% (wt/wt) for LGO. The newly isolated strain CYKS1 is considered to have good potential for application in the biodesulfurization of fossil fuels.

* Corresponding author. Mailing address: BioProcess Engineering Research Center, Korea Advanced Institute of Science and Technology, 373-1, Kusong-dong, Yusung-gu, Taejon 305-701, Korea. Phone: 82 42 869 3927. Fax: 82 42 869 8800. E-mail: ychang{at}sorak.kaist.ac.kr.

Appl Environ Microbiol, June 1998, p. 2327-2331, Vol. 64, No. 6
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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