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PubMed1965

BIOCHEMICAL CHANGES DURING THE GROWTH OF FUNGI. II. ERGOSTEROL AND FATTY ACIDS IN PENICILLIUM ATROVENETUM.

Van Etten, James L. (University of Illinois, Urbana), and David Gottlieb. Biochemical changes during the growth of fungi. II. Ergosterol and fatty acids in Penicillium atrovenetum. J. Bacteriol. 89:409-414. 1965.-Changes in the lipid constituents of Penicillium atrovenetum were studied during the growth and development of this fungus. The stages in development, as measured by the dry weight, were divided into four phases: lag, log, stationary, and death. The total fatty acids on a dry-weight basis increased from a minimum in the spores to a maximum near the end of the log phase of growth. The major fatty acids were palmitic, stearic, oleic, and linoleic. Myristic, pentadecanoic, palmitoleic, heptadecanoic, linolenic, arachidic, and heptadecenoic acids, together with two unidentified components, were also present in the fatty acid fraction. Compared to ungerminated spores, young mycelium contained a much lower percentage (on the basis of total fatty acids) of linoleic acid. There was a corresponding increase of oleic acid. Except for palmitic acid, which remained constant, the remaining fatty acids increased slightly. During subsequent growth of the fungus, linleic acid decreased, whereas the percentage of palmitic and stearic acids increased steadily from the lag phase to the end of the log phase. Ergosterol was the only sterol detected. The percentage of ergosterol, on a dry-weight basis, increased to a maximum at the start of the log phase and then steadily decreased. The following changes in lipids appear to be associated with the development and aging of fungi: (i) the presence of a relatively high content of nonsaponifiable lipid and ergosterol in the young mycelium, and their later decrease with age, and (ii) a shift from more unsaturated to less unsaturated fatty acids with age.

Ergocalciferols↗
PubMed1965

LIPIDS OF DEBARYOMYCES HANSENII.

Merdinger, Emanuel (Roosevelt University, Chicago, Ill.), and Edward M. Devine, Jr. Lipids of Debaryomyces hansenii. J. Bacteriol. 89:1488-1493. 1965.-The separation of neutral lipids and phospholipids from the lipid extract of Debaryomyces hansenii NRRL Y-1448 was accomplished by using a single column packed with silicic acid. The neutral lipids comprised 67%, and the phospholipids 33%, of the total lipid extract. Qualitative and quantitative characterization of the lipids was effected by various analytical procedures. Gas chromatography of the fatty acid methyl esters showed 11 acids, of which 59.7% were unsaturated. The most abundant among the unsaturated acids was the monounsaturated C18 acid (50.1%). Among the saturated acids, palmitic acid (23.5%) prevailed. Ratios of fatty acid to glycerol, phosphorus to glycerol, and phosphorus to fatty acid were ascertained for combined cuts from the neutral lipids and the phospholipids. The presence of ergosterol, stigmasterol, and an unidentified sterol was established by gas chromatography. Also present were saturated hydrocarbons containing 16 to 39 carbon atoms, C22 being the most prevalent.

Chemical Phenomena↗