【摘要】 为筛选出防治小菜蛾的农药新剂型，以蜡质玉米淀粉为原料，用普鲁兰酶法，将蜡质玉米淀粉的支链酶解成直链淀粉；用乙醇沉降法制备直链淀粉纳米颗粒载体，并制备出10%氯虫苯甲酰胺纳米可湿性粉剂。采用浸虫法比较了97%原药、35%氯虫苯甲酰胺水分散粒剂和10%氯虫苯甲酰胺纳米可湿性粉剂对小菜蛾的室内毒力。结果表明：药后24 h,3种药剂的LC50分别为5.84、4.11、3.75 mg/L，毒力大小为10%纳米可湿性粉剂>35%氯虫苯甲酰胺水分散粒>97%原药；药后48 h，它们的LC50分别为2.76、2.61、2.66 mg/L；毒力大小依次为35%氯虫苯甲酰胺水分散粒>10%纳米可湿性粉剂>97%原药。10%氯虫苯甲酰胺纳米制剂药后24h对小菜蛾毒力显著高于(p<0.05,p<0.01)其他2种药剂，但药后48 h对小菜蛾的毒力与其他2种药剂无显著差异(p>0.05,p>0.01)。更多还原

【Abstract】 In order to screen out new formulations of pesticides to control Plutella xylostella, we selected waxy corn starch as the raw material. The branched chain of waxy corn starch was enzymatically converted into amylose by Pullulan enzymatic method. Then nanoparticle was prepared as drug carriers as well as chlorantraniliprole 10% nano-wettable powder obtained by ethanol deposition method. The laboratory toxicity of chlorantraniliprole 97% technical,chlorantraniliprole 35% aqueous dispersible granules and chlorantraniliprole 10% nano-wettable powder to Plutella xylostella was compared by larva dipping method. The results showed that LC50 of the three treatments groups were 5.84,4.11, and 3.75 mg/L after 24 hours, respectively, and the toxicity sequence was as follows: chlorantraniliprole 10%nano-wettable powder > chlorantraniliprole 35% aqueous dispersible granules > 97% technical; LC50 of the three treatments groups were 2.76, 2.61, 2.66 mg/L after 48 hours, respectively, and the toxicity sequence was as follows:chlorantraniliprole 35% aqueous dispersible granules > chlorantraniliprole 10% nano-wettable powder > 97% technical.Specially, the toxicity of chlorantraniliprole 10% nano-wettable powder to Plutella xylostella was significantly higher than that of the other two treatments groups after 24 hours(p<0.05, p<0.01). However, there was not significantly different from three treatments groups after 48 hours(p>0.05, p>0.01).更多还原