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Cellular fatty acid composition of Pseudomonas marginata and closely associated bacteria.

ABSTRACT

The cellular fatty acid compositions of the lectotype strain and four clinical isolates of Pseudomonas marginata were determined by gas-liquid chromatography and compared with 11 strains of the Centers for Disease Control Pseudomonas-like group 2, which are similar to P. marginata in a number of conventional biochemical tests. Isolates of P. marginata were readily distinguished from Pseudomonas-like group 2 by the presence of a C17:0 cyclopropane acid and hydroxy acids 3-OH-C14:0, 2-OH-C16:0, 3-OH-C16:0, and 2-OH-C18:1, whereas strains of Pseudomonas-like group 2 contained C16:1 delta 9 as a major acid with small amounts of 3-OH-C12:0 and 2-OH-C14:0 acids. Our data show that cellular fatty acid composition provides useful additional information that can be combined with selected conventional tests to provide a more reliable and rapid identification of P. marginata and related bacteria.

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