Hashim M S, Devi K S
Department of Biochemistry, University of Kerala, Thiruvananthapuram 695 581, India.
Fitoterapia. 2003 Dec;74(7-8):670-6. doi: 10.1016/s0367-326x(03)00186-2.
Extracts from the stem bark of Streblus asper possess insecticidal activity against the fifth instar of Dysdercus cingulatus. Methanolic extract showed an LC(50) value of 5.56 microg/insect. Partition with chloroform increased the insecticidal activity (LC(50) 2.01 microg/insect). Three polyphenolic rich fractions were obtained from silica-gel column chromatography of the chloroform fraction and found to have noteworthy insecticidal activity (LC(50): 1.82 microg, 2.70 microg, 2.26 microg/insect) by topical application. This may provide a useful beginning for the development of biopesticides.
粗糙鹊肾树茎皮提取物对红蝽若虫五龄期具有杀虫活性。甲醇提取物的LC(50)值为5.56微克/昆虫。用氯仿分配可提高杀虫活性（LC(50)为2.01微克/昆虫）。从氯仿部分的硅胶柱色谱中获得了三个富含多酚的馏分，通过局部应用发现它们具有显著的杀虫活性（LC(50)分别为1.82微克、2.70微克、2.26微克/昆虫）。这可能为生物农药的开发提供一个有益的开端。
