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Chemical composition and biological activity of star aniseIllicium verumextracts against maize weevilSitophilus zeamaisadults

机译:八角茴香的化学组成和生物活性八角茴香提取物对玉米象鼻虫玉米Sitophilus大人

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摘要

This study aims to develop eco-friendly botanical pesticides. Dried fruits of star anise ( Illicium verum Hook.f. (Austrobaileyales: Schisandraceae)) were extracted with methyl alcohol (MA), ethyl acetate (EA), and petroleum ether (PE) at 25°C. The constituents were determined by gas chromatography-mass spectrometry, and the repellency and contact toxicity of the extracts against Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae) adults were tested. Forty-four compounds, whose concentrations were more than 0.2%, were separated and identified from the MA, EA, and PE extracts. The extraction yields of trans-anethole, the most abundant biologically active compound in I. verum , were 9.7%, 7.5%, and 10.1% in the MA, EA, and PE extracts, respectively. Repellency increased with increasing extract dose. The average repellency rate of the extracts against S. zeamais adults peaked at 125.79 µg/cm 2 72 hr after treatment. The percentage repellency of the EA extract reached 76.9%, making it a class IV repellent. Contact toxicity assays showed average mortalities of 85.4% (MA), 94.5% (EA), and 91.1% (PE). The EA extract had the lowest median lethal dose, at 21.2 µg/cm 2 72 hr after treatment. The results suggest that I. verum fruit extracts and trans-anethole can potentially be developed as a grain protectant to control stored-product insect pests. Other active constituents in the EA extract merit further research.
机译:这项研究旨在开发生态友好型植物农药。在25°C下,用甲醇(MA),乙酸乙酯(EA)和石油醚(PE)提取八角茴香的干果(八角茴香(Illicium v​​erum Hook.f.(Austrobaileyales:Schisandraceae))。通过气相色谱-质谱法确定成分,并测试提取物对玉米Sitophilus zeamais Motschulsky(鞘翅目:Curculionidae)成虫的排斥性和接触毒性。从MA,EA和PE提取物中分离并鉴定了44种浓度超过0.2%的化合物。反式茴香脑的提取率是马齿I中最丰富的生物活性化合物,在MA,EA和PE提取物中的提取率分别为9.7%,7.5%和10.1%。驱避剂随提取物剂量的增加而增加。处理后72小时,提取物对玉米(S. zeamais)成虫的平均排斥率达到峰值125.79 µg / cm 2 。 EA提取物的驱避百分率达到76.9%,使其成为IV级驱避剂。接触毒性试验显示平均死亡率为85.4%(MA),94.5%(EA)和91.1%(PE)。治疗后72小时,EA提取物的最低致死剂量中值为21.2 µg / cm 2 。这些结果表明,I。verum水果提取物和反茴香可以作为谷物保护剂来控制储藏产品的害虫。 EA提取物中的其他活性成分值得进一步研究。

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