Journal of Lipid Research, Vol 16, 12-18, Copyright © 1975 by Lipid Research, Inc.
Normal and branched alkanes from cast skins of the grasshopper Schistocerca vaga (Scudder)
DR Nelson and DR Sukkestad
Gas-liquid chromatographic and mass spectral analyses of the hydrocarbons
from cast skins of the grasshopper Schistocerca vaga (Scudder) demonstrated
the presence of four homologous series of alkanes: n-alkanes (35%),
monomethylalkanes (24%), dimethylalkanes (35%), and trimethylalkanes (3%).
The methyl branches were located towards the center of the molecule, and no
2- or 3-methylalkanes were detected by mass spectrometry. The branched
alkanes occurred as isomeric mixtures with the methyl group(s) usually
located on carbon atom 11, 13, 15, or 17. In the di- and trimethylalkanes,
the branch points had isoprenoid spacing. Of the total hydrocarbons, the
major component of the n-alkane series was nonacosane, 23%; of the
monomethylalkanes, it was 11-, 13-, 15-, and 17- methylpentatriacontanes,
13%; of the dimethylalkanes, 9,13-, 11,15-, 13,17-, and
15,19-dimethylpentatriacontanes, 20%; and of the trimethylalkanes,
11,15,19- and 13,17,21-trimethylpentatriacontanes, 1%.
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