Mass spectra of methyl-branched hydrocarbons from eggs of the tobacco hornworm

[摘要] Hydrocarbons from three homologous series of branched alkanes from the eggs of the tobacco hornworm, Manduca sexta (L.), were identified by mass spectrometry. Gas–liquid chromatography (GLC) peaks 37-A (equivalent chain length of 37.2) and 39-A (equivalent chain length of 39.2) were mixtures of 13-, 15-, 17-, and 19-methylheptatriacontane and 13-, 15-, 17-, and 19-methylnonatriacontane, respectively. GLC peaks 33-B, 37-B, and 39-B with equivalent chain lengths of 33.4, 37.4, and 39.4, respectively, were mixtures of 13,17- and 15,19-dimethyltritriacontane, 13,17-, 15,19-, and 17,21-dimethylheptatriacontane, and 13,17-, 15,19-, and 17,21-dimethylnonatriacontane, respectively. GLC peak 37-C (equivalent chain length of 37.6) was a mixture of 11.15,19-, 13,17,21-, and 15,19,23-trimethylheptatriacontane.

[关键词] methyl-branched alkanes;gas–liquid chromatography;insects