一种新型微波辅助萃取法用于中药刺五加中总黄酮萃取的研究

微波萃取法是目前世界上公认的绿色样品预处理技术之一 .它在环境、生化、食品、工业以及天然产物和中药等领域均有广泛的应用 1～ 4 ] .目前 ,最常用的微波萃取系统有两种 5] ,一种是使用多模式微波炉 ,在密闭容器中加热样品及有机溶剂 ,将目的组分从样品基体中萃取出来 .由于在密闭容器中 ,被萃取样品和溶剂处于高压下 ,温度很高 ,使待萃取物的溶解度增大 ,可获得更高的萃取率 .同时 ,用于这种微波萃取的系统一般可同时容纳 9～ 1 2个萃取罐 ,使试样的批量处理能力大大提高 .该法最主要的缺点是萃取后的液体一般需经离心分离或微孔玻璃…

A Novel Microwave-assisted Extraction Method for Extracting Flavonoids from Radix et Caulis Acanthopanacis Senticosi

In this study a novel microwave-assisted extraction(MAE) device was presented. In this newly developed system, a 3/4 wavelength microwave resonance cavity was used as the microwave coupling device for replacing a traditional microwave oven. This device is used to extract flavonoids from Radix et caulis acanthopanacis senticosi. The effects of solvent concentration, microwave forward power and solvent uptake rate on the extraction yield of flavonoids were investigated by using orthogonal experimental design. The results show that the effects of the solvent(ethanol) concentration and solvent uptake rate on the extraction yield of flavonoids are very significant, the effect of the interaction of solvent concentration and solvent uptake rate is significant and the effects of the other factors are general. Under the optimal conditions of MAE the extraction yield of flavonoids by this system is 46% higher than that by Soxhlet method. The RSD of the method was lower than 6%.