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[Objective] The insecticidal and antibacterial bioactivity of Wikstroemia chamaedaphne Meissn were screened and bioactive substances in it were separated and purified. [Method]The Wikstroemia chamaedaphne Meissn was conducted ultrasonic extraction in petroleum ether, ethyl acetate and methanol. The insecticidal activity of Wikstroemia chamaedaphne Meissn to Mythimna separata walker and aphid were determined. The antibacterial activity of Wikstroemia chamaedaphne Meissn to Fusarium graminearu, Glomerella cingulata, F.oxysporium f.sp niveum, Alternaria solani and Fusarium oxysporium were also determined. The bioactivity-guided methods such as opencolumn chromatography and Pre-HPLC method were used to separate active components in petroleum ether extract from Wikstroemia chamaedaphne Meissn. [Result] When the concentration was 500 mg/L, 3 kinds of extracts from Wikstroemia chamaedaphne Meissn didn’t show obvious antibacterial bioactivity to 5 kinds of test samples. When the concentration was 5%, petroleum ether extract show certain topical toxicity to aphids. The ethyl acetate extract showed certain antifeedant activity to 3rd instar Larvae of Mythimna separata Walker. The fraction F4 of petroleum ether extract possessed highest topical toxicity to aphids and the lethality was 60.00%.[Conclusion] Wikstroemia chamaedaphne Meissn contained many insecticidal constituents whose active parts and mechanism were needed further researches. 相似文献
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[目的]对河朔荛花进行杀虫、抑菌生物活性筛选,并对其活性成分进行分离提纯。[方法]用石油醚、乙酸乙酯、甲醇对河朔荛花进行超声波提取,进行粘虫、蚜虫的杀虫生物活性测定,以及对苹果炭疽病菌、西瓜枯萎病菌、马铃薯干腐病菌、小麦赤霉病菌及番茄早疫病菌的抑菌活性测定。并采用活性追踪法,应用常压柱层析法结合重结晶T、LC等技术,对河朔荛花石油醚浸膏中活性成分进行了分离。[结果]在浓度为500 mg/L时,河朔荛花3种提取物对5种供试菌种均没有明显的抑菌活性;在浓度为5%时石油醚提取物对蚜虫具有一定的触杀活性;乙酸乙酯提取物对3龄粘虫具有一定的拒食活性;对石油醚提取物通过柱层析分离,得馏分F4对蚜虫的触杀活性最高,其致死率达60.00%。[结论]河朔荛花所含的杀虫活性成分较多,其活性部分及作用机理值得进一步研究。 相似文献
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