1887

Abstract

group D2 (CGD2) are lipophilic antibiotic-multiresistant bacteria involved in some infections of immunocompromised patients. The fatty acid composition and structure of different strains was established by several mass spectrometric methods, particularly negative ion tandem mass spectrometry coupled with capillary gas chromatography. Non-hydroxylated fatty acid profiles of three strains of CGD2 (ATCC 43042, ATCC 43043, ATCC 43044) were almost identical and revealed the presence of several straight chain unsaturated fatty acids from the -9 series, with even carbon numbers ranging from 14 to 24. Branched saturated fatty acids were mainly -heptadecanoic acid and tuberculostearic acid. Surprisingly, a relatively large quantity of 10-methylene octadecanoic acid was found. The non-hydroxylated fatty acid profile of one rare -lactam susceptible strain (SC1) was different; 10-methylene octadecanoic acid was lacking whereas tuberculostearic acid was much more abundant. In contrast, the four CGD2 strains displayed highly similar mycolic acid patterns. The major mycolic acid species corresponded to C32, C30 and C28 bis-unsaturated with a double bond on each branch at the -9 position. The comparison of the mycolic acid composition and structure with those of other medically important corynebacteria strains, revealed a characteristic pattern for CGD2 strains, and CGD2 strains were easily distinguished from (CIP 82.51).

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1991-08-01
2021-05-17
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