Affiliation:
1. Department of Biology, University of Houston, Houston, Texas 77004
2. Department of Biological Sciences, Louisiana State University, New Orelans, Louisiana 70122
Abstract
The lipids of
Rhizopus arrhizus
Fischer mycelia and sporangiospores were extracted, isolated, and separated by thin-layer, liquid, and gas chromatography. Structural confirmations of the compounds were made by a gas chromatographmass spectrometer combination. The
n
-heptane fraction contained squalene (1%) as a major hydrocarbon constituent. Other major lipid classes detected were free fatty acids, naturally occurring methyl esters of fatty acids, triglycerides, sterols, and polar lipids. The polar lipids (44.4%) were found in the highest concentrations, and the triglycerides (22.1%), sterols (16.7%), and free fatty acids (11.7%) were present in lesser concentrations. This is the first report of naturally occuring methyl esters of long-chain fatty acids being present in fungal mycelium. There appears to be a preference for incorporation of unsaturated acids into the complex lipids, with the exception of the triglycerides. The major saturated fatty acids in the mycelium were palmitic (C
16
) and arachidic (C
20
), whereas the major unsaturated acids were oleic (C
18:1
) and linoleic (C
18:2
), respectively.
Publisher
American Society for Microbiology
Subject
Molecular Biology,Microbiology
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