Identification and characterization of novel short-chain acid esters as surface lipid components of Heliothis virescens pupae. Effects of sorbic acid in the diet
Mardaus, M.C. | Buckner, J.S.
Two previously unreported lipid classes were characterized which are present on the cuticular surface of laboratory-reared tobacco budworm, (Heliothis virescens Fabricius) pupae only when the mold and yeast inhibitor, (E,E)-2,4-hexadienoic acid (sorbic acid) is added to the larval diet. One lipid fraction was identified as esters of sorbic acid and C26, C24, C28, C22 and C30 primary alcohols (listed in descending order of abundance). The second, less polar lipid fraction was shown to consist of esters of 4-hexenoic acid and the same C22-C30 even-chain primary alcohols. The two lipid classes were identified by thin-layer chromatography (TLC), gas chromatographic retention times, capillary gas chromatography-mass spectrometry (CGC-MS), and proton magnetic resonance (PMR) spectroscopy. Results of the same analyses on synthetic compounds, long-chain alkanyl esters of 2-, 3- and 4-hexenoic acids and 2,4-hexadienoic acid, are also presented.
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