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J Clin Microbiol. 1975 May; 1(5): 414-419

Cellular fatty acids of Alcaligenes and Pseudomonas species isolated from clinical specimens.

ABSTRACT

The cellular fatty acid composition of 25 clinical isolates of Alcaligenes and Pseudomonas was determined by gas-liquid chromatography (GLC). The GLC fatty acid profiles of three species of Pseudomonas were markedly different from those of Alcaligenes. The most significant differences were the presence and relative amounts of hydroxy, branched-chain, and cyclopropane fatty acids. One of the major fatty acids in A. faecalis was a 17-carbon cyclopropane (17 delta) acid, whereas a 15-carbon branched-chain acid (13-methyl tetradecanoate) characterized isolates of P. putrefaciens. The determination of these fatty acids by GLC provides a rapid and specific means of distinguishing clinical isolates of Pseudomonas and Alcaligenes.

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