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There are a few reports about the lipid metabolism of dermatophytes. In this communication, the qualitative and quantitative changes of lipid composition during the growth stages were studied principally with Epidermophyton floccosum. The acyl group composition of total lipids of Trichophyton rubrum and Microsporum cookei were also examined. The lipids of E. floccosum amounted to approximately 4% of the dry cell weight. Neutral lipids consisted of mainly triglycerides and sterols, and major polar lipids were phosphatidylcholine, phosphatidylethanolamine, and an unusual lipid "X" which has not been identified yet. The fatty acids found in triglycerides and phospholipids were palmitic, palmitoleic, stearic, oleic, linoleic acids. The unusual polar lipid "X" which appeared between phosphatidylethanolamine and cardiolipin on TLC plate was found to contain no phosphorus. The acyl group composition of this lipid "X" was markedly different from those of triglycerides, phosphatidylcholine and phosphatidylethanolamine.There was no significant changes in the fatty acid composition of E. floccosum and T. rubrum during the cell growth, while M. cookei revealed its profound changes. The sterol composition of E. floccosum showed striking, qualitative as well as quantitative changes depending on the growth stage.
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