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Characterization and distribution of the hydrocarbons found in diapausing pupae tissues of the tobacco hornworm, Manduca sexta (L.)



Characterization and distribution of the hydrocarbons found in diapausing pupae tissues of the tobacco hornworm, Manduca sexta (L.)



Journal of Lipid Research 22(1): 103-112



The cuticular hydrocarbons of diapausing pupae of the tobacco hornworm, M. sexta (L.), are composed of 2 types of hydrocarbons: n-alkanes (3%) and unsaturated hydrocarbons (97%). The integument, fat body, muscle and hemolymph are composed of 3 types of hydrocarbons: n-alkanes (9, 6, 9 and 2%, respectively), branched alkanes (75, 85, 80 and 56%, respectively) and unsaturated hydrocarbons (16, 9, 11 and 42%, respectively). The absence of branched alkanes on the cuticular surface indicated that hydrocarbons are selectively synthesized or deposited according to the presence or absence of methyl branches in the molecule. The hydrocarbons consisted of homologous series of n-alkanes from 21-41 C atoms, monomethylalkanes from 23-39 C atoms, dimethylalkanes from 25-43 C atoms and trimethylalkanes from 33-37 C atoms. All branched components had methyl groups near the center of the molecule, and the di- and trimethyl branched components had 3 methylene units between the branch points. Straight chain alkenes, alkadienes and alkatrienes from 23-44 C atoms were partially characterized. The percentage composition of each homologous series varied from tissue to tissue.

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Accession: 000837373

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PMID: 7217775


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