Odor and Volatile Compounds in Liquid Swine Manure. I. Carboxylic Acids and Phenols

Abstract
Seventeen carboxylic acids and four phenol compounds were isolated from liquid swine manure by steam distillation and identified by gas chromatography-mass spectrometry. The major components are butyric, isovaleric, benzoic, phenylacetic acids, and p-cresol. The only carboxylic acid fraction has the same odor as liquid acidic swine manure. The odor of the phenols is rather pleasant and sweetish. The butyric, isovaleric, and phenylacetic acids have a very strong malodor, while the odor of phenylacetic acid is identical with that of liquid acidic swine manure.