Characterization and insecticidal activity of sucrose octanoatesShujun Li, Zijuan Song, Zhiming Liu and Songtao Bai
Key laboratory of Biobased material Science and technology of Ministry of Education, Northeast Forestry University, 26 Hexing Road, Harbin 150040, People's Republic of China
Accepted 16 August 2007; published online 20 October 2007
Abstract - Sucrose esters, a new class of biopesticides related to the Nicotiana family, were synthesized efficiently under vacuum and isolated by column chromatography (CC). The isolations were characterized with mass spectrometry (MS) and nuclear magnetic resonance (NMR). Their insecticidal activities against Lymantria dispar grubs were determined. Thin-layer chromatography ultraviolet (TLC-UV) spectrophotometric analyses showed that the ratio of the monoesters to others in the reaction product was 1.48:1. After isolation by CC, three groups, which had polarity from weak to strong, were obtained in high purity. Both electrospray ionization (ESI)-MS and 1H NMR analyses proved that these groups were triesters, diesters and monoesters, respectively. According to their peak areas of gas chromatographic (GC) analyses, the monoester content was 61.72%. Among these esters, the reaction product and monoesters presented the highest insecticidal activities. The Lymantria dispar grub mortality reached 79.2% after being treated for 5 days with 12 mg/mL of the reaction products. The results indicate the synthesized sucrose octanoate product under vacuum is a good insecticide candidate.
Key words: Insecticidal activity / sucrose octanoate / isolation / characterization
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© INRA, EDP Sciences 2008