Abstract
Two strains of Enterococcus faecalis isolated from the ovine rumen and known to hydrate oleic acid were shown to transform linoleic acid by hydration into two products. The products, identified as 10-hydroxy-12-octadecenoic acid and 13-hydroxy-9-octadecenoic acid, were formed during stationary phase in yields of 13% and 6% respectively. Yields increased to 22% and 14% when culture conditions were optimised. To our knowledge, this is the first report of 13-hydroxy-9-octadecenoic acid production by bacteria. During a search for further linoleic-acid-hydrating bacteria, a strain of Streptococcus bovis isolated from bovine faeces and the ruminal strain S. bovis JB1 were found to hydrate linoleic acid. Both strains formed only one product and the most rapid appearance occurred during exponential growth. The S. bovis product, identified as 13-hydroxy-9-octadecenoic acid, formed in a yield of 28%. This study provides the first information on linoleic acid hydration by ruminal bacteria.
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