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Appl. Environ. Microbiol., Dec 1995, 4362-4366, Vol 61, No. 12
Copyright © 1995, American Society for Microbiology

Sulfur-Specific Microbial Desulfurization of Sterically Hindered Analogs of Dibenzothiophene

MK Lee, JD Senius and MJ Grossman
Exxon Research and Engineering Co., Corporate Research, Annandale, New Jersey 08801

Dibenzothiophenes (DBTs) bearing alkyl substitutions adjacent to the sulfur atom, such as 4,6-diethyldibenzothiophene (4,6-DEDBT), are referred to as sterically hindered with regard to access to the sulfur moiety. By using enrichment cultures with 4,6-DEDBT as the sole sulfur source, bacterial isolates which selectively remove sulfur from sterically hindered DBTs were obtained. The isolates were tentatively identified as Arthrobacter species. 4,6-DEDBT sulfone was shown to be an intermediate in the 4,6-DEDBT desulfurization pathway, and 2-hydroxy-3,3(prm1)-diethylbiphenyl (HDEBP) was identified as the sulfur-free end product.

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