Biodegradation of C5-C8 Fatty Acids and Production of Aroma Volatiles by Myroides sp. ZB35 Isolated from Activated Sludge

Zijun Xiao; Xiankun Zhu; Lijun Xi; Xiaoyuan Hou; Li Fang; Jian R. Lu

doi:10.1007/s12275-014-4109-x

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Research Support, Non-U.S. Gov't
Biodegradation of C5-C8 Fatty Acids and Production of Aroma Volatiles by Myroides sp. ZB35 Isolated from Activated Sludge: Zijun Xiao ¹, Xiankun Zhu ¹, Lijun Xi ¹, Xiaoyuan Hou ¹, Li Fang ², Jian R. Lu ³; Journal of Microbiology 2014;52(5):407-412.
DOI: https://doi.org/10.1007/s12275-014-4109-x
Published online: May 9, 2014

¹Centre for Bioengineering and Biotechnology, China University of Petroleum, Qingdao 266580, P.R. China, ²Liaohe Petrochemical Co., PetroChina Co., Ltd., Panjin 124022, P.R. China, ³Biological Physics Laboratory, School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK¹Centre for Bioengineering and Biotechnology, China University of Petroleum, Qingdao 266580, P.R. China, ²Liaohe Petrochemical Co., PetroChina Co., Ltd., Panjin 124022, P.R. China, ³Biological Physics Laboratory, School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK

Received: 19 February 2014 • Revised: 2 April 2014 • Accepted: 6 April 2014

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Abstract

In the effluents of a biologically treated wastewater from a heavy oil-refining plant, C5-C8 fatty acids including penta-noic acid, hexanoic acid, heptanoic acid, octanoic acid, and 2-methylbutanoic acid are often detected. As these residual fatty acids can cause further air and water pollution, a new Myroides isolate ZB35 from activated sludge was explored to degrade these C5-C8 fatty acids in this study. It was found that the biodegradation process involved a lag phase that became prolonged with increasing acyl chain length when the fatty acids were individually fed to this strain. However, when fed as a mixture, the ones with longer acyl chains were found to become more quickly assimilated. The branched 2- methylbutanoic acid was always the last one to be depleted among the five fatty acids under both conditions. Metabolite analysis revealed one possible origin of short chain fatty acids in the biologically treated wastewater. Aroma volatiles inclu-ding 2-methylbutyl isovalerate, isoamyl 2-methylbutanoate, isoamyl isovalerate, and 2-methylbutyl 2-methylbutanoate were subsequently identified from ZB35 extracts, linking the source of the fruity odor to these esters excreted by Myroides species. To our best knowledge, this is the first finding of these aroma esters in bacteria. From a biotechnological viewpoint, this study has revealed the potential of Myroides species as a promising source of aroma esters attractive for food and fragrance industries.

Keywords: Myroides;biodegradation;C5-C8 fatty acids;aroma esters;pathway

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Biodegradation of C5-C8 Fatty Acids and Production of Aroma Volatiles by Myroides sp. ZB35 Isolated from Activated Sludge

J. Microbiol. 2014;52(5):407-412. Published online May 9, 2014

DOI: https://doi.org/10.1007/s12275-014-4109-x

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