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2-Ethyhexyl nitrate (2-EHN) is a major additive of fuel which is used tocomply with the cetane number of diesel. Because of its wide use and possibleaccidental release, 2-EHN is a potential pollutant of the environment. In thisstudy, Mycobacterium austroafricanum IFP 2173 was selected among severalstrains as the best 2-EHN degrader. The 2-EHN biodegradation rate was increasedin biphasic cultures where the hydrocarbon was dissolved in an inertnon-aqueous phase liquid (NAPL), suggesting that the transfer of thehydrophobic substrate to the cells was a growth-limiting factor. Carbon balancecalculation as well as organic carbon measurement indicated a release ofmetabolites in the culture medium. Further analysis by gas chromatographyrevealed that a single metabolite accumulated during growth. This metabolitehad a molecular mass of 114 Da as determined by GC/MS and was provisionallyidentified as 4-ethyldihydrofuran-2(3H)-one by LC-MS/MS analysis.Identification was confirmed by analysis of the chemically synthesized lactone.Based on these results, a plausible catabolic pathway is proposed whereby 2-EHNis converted to 4-ethyldihydrofuran-2(3H)-one, which cannot be metabolisedfurther by strain IFP 2173. This putative pathway provides an explanation forthe low energetic efficiency of 2-EHN degradation and its poorbiodegradability.

Biodegradation of 2-ethylhexyl nitrate (2-EHN) by Mycobacterium austroafricanum IFP 2173