The methyl esters, particularly methyl butyrate, are undesirably volatile. The free acids have low volatilities which, in conjunction with association and adsorption on the column and apparatus ...

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Concentrations of volatile fatty acids (VFAs) (acetate, propionate, n-butyrate, iso-butyrate, iso-valerate, and n-valerate) were measured in rumen fluid samples using gas chromatography (GC) as ...