蛇根草种子对致倦库蚊的杀幼虫活性
Mosquito larvicidal activity of Rauvolfia serpentina L. seeds against Culex quinquefasciatus Say.
机构信息
Mosquito and Microbiology Research Units, Parasitology Laboratory, Department of Zoology, Burdwan University, West Bengal, India.
出版信息
Asian Pac J Trop Med. 2012 Jan;5(1):42-5. doi: 10.1016/S1995-7645(11)60243-5.
OBJECTIVE
To establish the larvicidal activities, if any of solvent extracts of Rauvolfia serpentina (R. serpentina) L. seeds against Culex quinquefasciatus (Cx. quinquefasciatus) Say, 1823 as target species.
METHODS
Seeds of R. serpentina were extracted with five solvents graded according to the polarity [viz. petroleum ether, benzene, ethyl acetate, acetone and absolute alcohol] continuing one after another with the same seeds.
RESULTS
Mortality rate with petroleum ether extract was significantly higher than other extracts. The mortality rates of late 3rd instar larvae were 50.33±5.51, 10.00±1.00, 0.00±0.00, 21.33±1.53 and 0.00±0.00 in 100 ppm concentration of petroleum ether, benzene, ethyl acetate, acetone and absolute alcohol respectively, after 24 h of exposure period.
CONCLUSIONS
Results of this study show that petroleum ether extract of R. serpentina seed may be considered as a potent source of mosquito larvicidal agent.
目的
研究蛇根木（Rauvolfia serpentina）种子的不同溶剂提取物（按极性分级，依次为石油醚、苯、乙酸乙酯、丙酮和无水乙醇）对致倦库蚊（Culex quinquefasciatus）幼虫的杀蚊活性。
方法
用上述相同的种子，依次用 5 种溶剂连续提取蛇根木种子。
结果
石油醚提取物的死亡率显著高于其他提取物。暴露 24 小时后，浓度为 100ppm 的石油醚、苯、乙酸乙酯、丙酮和无水乙醇提取物对 3 龄晚期幼虫的死亡率分别为 50.33±5.51、10.00±1.00、0.00±0.00、21.33±1.53 和 0.00±0.00。
结论
本研究结果表明，蛇根木种子的石油醚提取物可能是一种潜在的蚊虫幼虫杀蚊剂来源。
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