黄芩中黄芩苷常规回流浸提工艺优化研究

采用常规回流浸提法,以50%乙醇水溶液提取黄芩,研究了浸提时间、浸提温度、液固比和颗粒粒度对黄芩苷的得率和含量的影响。采用四因素二次回归正交旋转组合设计对工艺参数进行了优化,建立了黄芩苷得率与浸提时间、浸提温度、颗粒粒度及液固比之间关系的回归方程。优化工艺为:浸提时间为2.0 h、浸提温度为62.3℃、颗粒粒度为80目、液固比为27.3 mL.g-1时,黄芩苷得率的理论最大值为8.88%。

辛醇改性纳米二氧化硅表面的研究

The reaction of nano-SiO2 grafted with 1-octyl alcohol was carried out by the normal reflux and the microwave irradiation method respectively. The surface structure and characteristics of modified silica powder were studied and characterized by various experiments and methods such as contact angle, viscosity, FT-IR, DTA, TGA, XPS et al. The results indicated that the nano-SiO2 surface was modified notably by the two methods. Compared with the normal reflux method, the microwave irradiation method has the merits of promoting the reaction and increasing the grafting rate.