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The nature and relative abundance of fatty acids produced by two strains each ofBacillus thuringiensis and ofB. anthracis were studied by gas-liquid chromatography on a 12,000 theoretical plate polyester column capable of partially resolving iso- and anteiso-fatty acids with the same number of carbon atoms. Unsaturated fatty acids as the bromo derivatives were separated from the saturated acids and resolved in a short SE-30 column by use of programmed-temperature gas chromatography. All four strains produced 16 major fatty acids: 9 branched (i-C12 , i-C13 , i-C14 , i-C15 , i-C16 , i-C17 , a-C13 , a-C15 , and a-C17 ), 3 normal (n-C14 , n-C15 , and n-C16 ), and 4 monounsaturated (i-C16 1= , i-C17 1= , a-C17 1= , and n-C16 1= ), in addition to some minor fatty acids. In all cases, 12 branched acids, including saturated and monounsaturated, made up over 70% of the total fatty acids, and iso-C15 acid was most abundant. These fatty acid distribution patterns were very similar to those ofB. cereus andB. cereus var.mycoides . There were, however, minor but clear differences between the fatty acid distribution patterns ofB. thuringiensis andB. anthracis. B. thuringiensis , likeB. cereus , produced higher proportions of i-C13 , a-C13 , and i-C14 fatty acids than didB. anthracis . This difference between these two species could be useful as a supplemental criterion in their differentiation. Indications are that the enzyme systems for monounsaturated fatty acid synthesis inB. thuringiensis andB. anthracis prefer normal fatty acids as substrates rather than branched-chain fatty acids.

journal of bacteriology

Fatty Acids in the GenusBacillusII. Similarity in the Fatty Acid Compositions ofBacillus thuringiensis, Bacillus anthracis, andBacillus cereus