Read e-book online Advances in lipid research. Volume 2 PDF

By Rodolfo Paoletti, Dr. David Kritchevsky

ISBN-10: 148319938X

ISBN-13: 9781483199382

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1964a). The underlying biochemical basis for these variations will be discussed in Section IV,A. The lipids of a psychrophile having the properties of a Serratia species have been found to contain about 50% phosphatides with a composition similar to that of Serratia marcescens, except that the unidentified ninhydrin-positive component (presumably lipoamino acids) is absent; the fatty acids contain high proportions of palmitic and palmitoleic acids and smaller amounts of myristic and myristoleic acids, and are devoid of any cyclopropane acids (Kates and Hagen, 1964).

Relatively little is known about the intact lipids of mycobacteria, most of the studies being confined to fatty acids, mycolic acids, and derivatives of mycolic acids. Cells of mycobacteria have high contents of lipids (10-20% free lipids, 5-20% bound lipids) which have, characteristically, low amounts of phosphatides and large proportions of mycolic acids and waxes containing mycolic acid derivatives. The mycolic acids are complex branched chain hydroxy acids having usually eighty-seven or eighty-eight carbon atoms; their isolation and structure determination have been amply described by Asselineau and Lederer (1960), and Asselineau (1962).

The unsaponifiable fractions of L. casei, L. arabinosus, and L. acidophilus were mixtures of nonpolar, unsaturated, and branched chain compounds which did not contain digitonin-precipitable material. The fatty acids of these bacteria (Thorne and Kodicek, 1962b) consisted largely of Ci 9 -cyclopropane acid, with progressively smaller amounts of Ci 8 -monoenoic, Ci 6 -monoenoic, and palmitic acids; only traces of branched chain acids were found, chiefly C 16 -branched, and no Ci 7 -cyclopropane fatty acid was detected (Table I I I ) .

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Advances in lipid research. Volume 2 by Rodolfo Paoletti, Dr. David Kritchevsky


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