CHEMICAL CONSTITUENTS AND INSECTICIDAL ACTIVITY OF THE Miconia ferruginata

Phytochemical investigation of the leaf extracts from Miconia ferruginata (Melastomataceae) led to the isolation and characterization of the flavonoids 5,6,7-trihydroxy-4'-methoxyflavone, 5-hydroxy-7,4'-dimethoxy-8-methylflavone and 5,7,4'-trihydroxy-6,8-dimetilflavone, triterpenes ursolic acid and oleanolic acid, in addition to the steroids β-sitosterol and stigmasterol. The structures of these compounds were proposed by spectroscopic analysis and comparison with literature data. This paper also describes the insecticidal effects of leaf extracts from M. ferruginata to one of the main pests of maize, the fall armyworm (Spodoptera frugiperda). The ingestion bioassays, the leaf extracts showed an elongation of the larval stage of 16.56 days as compared to the control.

对锈色野牡丹藤（Miconia ferruginata，野牡丹科Melastomataceae）的叶提取物开展植物化学研究，成功分离并表征了以下化合物：黄酮类成分包括5,6,7-三羟基-4'-甲氧基黄酮、5-羟基-7,4'-二甲氧基-8-甲基黄酮及5,7,4'-三羟基-6,8-二甲基黄酮；三萜类成分包括熊果酸与齐墩果酸；此外还分离得到甾类成分β-谷甾醇与豆甾醇。上述化合物的结构均通过光谱学分析，并与文献数据比对后予以推定。本研究同时报道了锈色野牡丹藤叶提取物对玉米主要害虫之一——草地贪夜蛾（Spodoptera frugiperda）的杀虫活性。在摄食生物测定中，与对照组相比，该叶提取物可使幼虫期延长16.56天。