Some monomethyl‐branched fatty acids from ruminant fats: Open‐tubular GLC separations and indications of substitution on even‐numbered carbon

Isomeric methyl esters of fatty acids in three groups (C 15 , C 17 , C 19 ) have been isolated from ruminant fats. Basic structural analysis by physiochemical techniques indicated that these odd‐numbered fatty acids were even chain with a single methyl branch on the chain. High resolution open‐tubular gas liquid chromatographic studies indicate that, with the exception of iso acid impurities in these fractions, only even‐numbered carbons of the fatty acid chains bear the methyl branch.