1887

Abstract

SUMMARY

Lipid contents of yeasts grown on glucose were: 5·4%; 9·4%; 2·7%; 107, 41%; 12·5%; 2·7%; and 9·1%. In each yeast about 80% of the lipid consisted of triglycerides. When the triglycerides from five of the yeasts were analysed in detail, an unsaturated acid was invariably found at the 2-position. With 107 and about 50% of the total triglyceride fatty acids were saturated, resulting in over 50% of the triglycerides being of the 1,3-disaturated-2-monounsaturated type. When 107 and were grown on individual -alkanes, from C to C, the fatty-acid composition varied according to the chain length of the substrate, although with -tridecane neither yeast produced tridecanoic acid in the triglycerideand with -dodecane only contained an appreciable amount of dodecanoic acid in the triglyceride (32% of the fatty acids). With both yeasts on each alkane substrate, the lipid contents were not only lower than when grown on glucose but contained a smaller proportion of triglyceride. Saturated acids were now located at the 2-position of the triglycerides: 107 grown on -tetradecane produced 46% of its triglycerides with a saturated acid at the 2-position. The main advantage to be gained by growing yeasts on -alkanes is, as far as lipid formation is concerned, the biosynthesis of specific fatty acids rather than the production of plant-like triglycerides.

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1972-08-01
2021-10-27
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