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Background  The desulphurization of dibenzothiophene (DBT), a recalcitrant thiophenic fossil fuel component by S erratia marcescens  (UCP 1549) in order for reducing the Sulphur content was investigated. The Study was carried out establishing the growth profile using Luria Bertani medium to different concentrations of DBT during 120 hours at 28°C, and orbital Shaker at 150 rpm.    Results  The results indicated that concentrations of DBT 0.5, 1.0 and 2.0 mM do not affected the growth of the bacterium. The DBT showed similar Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MCB) (3.68 mM). The desulphurization of DBT by  S. marcescens  was used with 96 hours of growth on 2 mM of DBT, and was determined by gas chromatography (GC) and GC-mass spectrometry. In order to study the desulphurization process by  S. marcescens  was observed the presence of a sulfur-free product at 16 hours of cultivation.    Conclusions  The data suggests the use of metabolic pathway “4S” by  S. marcescens  (UCP 1549) and formed biphenyl. The microbial desulphurization process by  Serratia  can be suggest significant reducing sulphur content in DBT, and showed promising potential for reduction of the sulfur content in diesel oil.

Oxidation of dibenzothiophene (DBT) by Serratia marcescens UCP 1549 formed biphenyl as final product