Abstract
1. 1. The cuticular and internal hydrocarbons of the khapra beetle Trogoderma granarium were studied by capillary column gas chromatography and mass spectrometry. n-Alkanes, 3-methyl-, 5-methyl-, 11-methyl-, 12-methyl-, 13-methyl-, 14-methyl- and 15-methylalkanes were found in the cuticular and internal lipids. 2. 2. Some quantitative differences of the compositions were estimated for cuticular and internal hydrocarbons. 3. 3. The n-alkanes in the samples are mostly odd chain lengths from 23 to 33 carbon atoms. In turn, the branched hydrocarbons consist of even carbon numbers ranging from C 26 to C 32, but the branching points are situated on the odd carbon numbers. 4. 4. There are similarities in the n-alkanes patterns extracted from khapra beetle and wheat grains, the latter of which are the natural nutrition of this pest.
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