Study of extraction insecticidal activity in Solidago
Abstract: This article first reflux method using aqueous solutions of different growth parts of a flower was extracted to study the root of a flower, stem and leaf extract of the insecticide. The results showed that: the stem extract of the ineffectiveness of insects and leaf extract significantly insecticidal effect. And then use a different extraction methods on the leaves of a flower to extract. The results showed that: Activity of methanol extract of the best ultrasound, ethanol extraction followed by extract obtained. Ultrasonic extraction is widely used in recent years, a new extraction technology. It is the use of ultrasound assisted solvent extraction, sound waves produce high-speed, strong role of cavitation effects and mixing, destruction of plant cells to solvent penetration into plant cells, reduce the extraction time, increase the extraction rate. Unique physical properties of ultrasound can promote plant cell and tissue broken or deformed, so that active ingredients from more fully, the extraction rate was significantly increased compared with the traditional craft up to 50-500%. Extraction is usually 24-40 minutes to get the best extraction rate and extraction time than traditional methods greatly reduce the 2 / 3, the best extraction temperature of 40-60 ℃, on the case of thermal instability, easy hydrolysis or oxidation active ingredients in plants has a protective effect, and greatly reduce energy consumption. Ultrasonic extraction of polar components from the molecular weight size restrictions apply to most types of Chinese herbal medicines and various components of the extract.
Keywords: Solidago; Ultrasonic extraction; ethanol extraction; insecticidal activity;
