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Composition of the silk lipids of the spider Nephila clavipes
Author(s) -
Schulz Stefan
Publication year - 2001
Publication title -
lipids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.601
H-Index - 120
eISSN - 1558-9307
pISSN - 0024-4201
DOI - 10.1007/s11745-001-0768-7
Subject(s) - spider silk , chemistry , silk , gas chromatography , spider , organic chemistry , polymer science , stereochemistry , chromatography , biology , ecology , materials science , composite material
A detailed analysis of the lipids of spider silk is given for the first time. Extracts of the silk from the golden orb weaver, Nephila clavipes , were studied by gas chromatography, mass spectrometry, and chemical derivatizations. The major group of the lipids consisted of methyl‐branched 1‐methoxyalkanes (methyl ethers) with up to four methyl groups in the chain (chain length between C 28 and C 34 ), which are unique to spiders. The position of the methyl branches was determined by conversion into cyanides, which allowed easy location of methyl branches. The second‐largest group included alkanes with a wide structural variety; 2‐methyl‐branched, even‐numbered hydrocarbons predominated. A general numerical method for the estimation of retention indices of alkanes and their derivatives is presented. Further components of the web included alkanols and alkanediols, fatty acids, and glyceryl ethers. Some comments on the biosynthesis of these compounds are also given.