Literature DB >> 11471698

Anaerobic degradation and methanogenic inhibitory effects of oleic and stearic acids.

J A Lalman1, D M Bagley.   

Abstract

Oleic acid, an 18 carbon acid with one double bond (C18:1) was degraded anaerobically to palmitic (C16:0) and myristic (C14:0) acid by-products at 21 C by a culture unacclimated to long-chain fatty acids. These by-products were degraded to acetate and ultimately to methane. In comparison, no long-chain fatty acid by-products were observed in unacclimated anaerobic cultures receiving stearic (C18:0) acid although slow removal of stearic acid occurred. Oleic acid concentrations above 30mg l(-1) inhibited acetate degradation but stearic acid up to 100 mg l(-1) did not inhibit aceticlastic methanogenesis. Hydrogenotrophic methanogenesis was slightly inhibited by oleic and stearic acids. A thermodynamic basis for comparing anaerobic C18 acid degradation and predicting by-products is presented.

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Year:  2001        PMID： 11471698     DOI： 10.1016/s0043-1354(00)00593-5

Source DB:  PubMed          Journal:  Water Res        ISSN： 0043-1354            Impact factor:   11.236


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