1887

Abstract

Three homologous series of a-mycolic acids (dicyclopropanoyl acids, monocyclopropanoyl monoenoic acids and dienoic acids) from 16 rapidly growing and 14 slowly growing mycobacteria were separated by argentation thin-layer chromatography and analysed by gas chromatography/mass spectrometry of their trimethylsilyl ether derivatives. Mycobacterial species were separated into five groups. Strains of group A contained similar amounts of even and odd carbon-numbered dienoic acids, with a methyl branch on the odd acids and a C--unit, as typified by and . Group B strains possessed similar amounts of even carbon-numbered dicyclopropanoyl -mycolic acids and odd carbon-numbered unsaturated acids with C- and C--units, as found in and . Group C strains contained mainly even carbon-numbered dicyclopropanoyl acids with C- and C-a-units, as shown by and . Group D strains possessed mainly odd carbon-numbered dienoic acids with a methyl branch and a C--unit, as seen in and . Group E strains had mainly even carbon-numbered dicyclopropanoyl acids with C- or C--units, as found in and . Many rapidly growing mycobacteria also produced -mycolic acids which were shorter in the length of the main carbon chain but whose a-units were the same as those in -mycolic acids from the same species. These -mycolic acids had either one or two double bonds and showed variations in both their unsaturation and overall size, which may be useful in taxonomic studies.

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1988-08-01
2022-01-22
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