Cellular fatty acids and fatty aldehydes of Listeria and Erysipelothrix.

The cellular fatty acid composition determined by gas chromatography-mass spectrometry, was found not to differ among Listeria monocytogenes, L. innocua and L. ivanovii. Slight quantitative differences found in the fatty acid pattern of L. welshimeri were significantly pronounced in L. denitrificans. L. murrayi and L. grayi displayed characteristic closely related patterns. Considerable amounts of fatty aldehydes and their dimethyl acetals were observed in hydrolysates and methanolysates of L. seeligeri. The fatty acid composition of Erysipelothrix rhusiopathiae was found to strongly differ from that of Listeria.