SYNTHESIS OF INSECTICIDAL SUCROSE ESTERS

摘要

Some synthetic sucrose esters (SE) are a relatively new class of insecticidal compounds produced by reacting sugars with fatty acids, which are safe for the environment. Especially, sucrose esters composed of C6-C12 fatty acids have more preferable insecticidal properties against many soft-bodied arthropod pests. In this paper, sucrose octanoate which has the highest activity against the range of arthropod species was synthesized by the trans-esterification method and proven its insecticidal property. Under the conditions of homogeneous liquid, sucrose octanoate was prepared by reacting ethyl octanoate with sucrose at reduced pressure, and the yield was 79.11%. Sucrose octanoate synthesized was identified and its property analyzed by IR, TLC and spectrophotometric analysis. It was proven that the ratios of monoester to polyester in sucrose octanoate was 1.48 : 1. The insecticidal activity of the synthetic sucrose octanoate was evaluated at a concentration of 4mg/mL and 8mg/mL. The Lymantria dispar grubs mortality from its contact toxicity was 72.5% after 36h, the revision insects reduced rate of Aphis glycines Matsumura reached above 80% at 4mg/mL-l and 8mg/mL-lafter treated 5 days, respectively. Since the SE products are nontoxic to humans and higher animals, fully biodegradable and hydrolyzed to readily metabolizable sucrose and fatty acid, they are not harmful to the crops, and appear to be good insecticide candidates.