表面包覆改性技术改善中药浸膏粉体流动性及吸湿性研究

研究表面包覆改性技术改善中药浸膏粉体流动性及吸湿性。以1%疏水性气相纳米二氧化硅为表面改性剂,穿心莲浸膏粉为模型药,应用3种不同工艺包覆模型药,以休止角、压缩度、平板角、黏附度为指标综合评价各粉体流动性,Mastersizer 2000激光粒度仪测定各粉体粒径及粒径分布,FEI扫描式电子显微镜观察粉体表面形态与结构,能谱仪测量粉体表面硅(Si)元素含量,药典法测定粉体吸湿性。3种工艺都能改善浸膏粉体的流动性,其中先分散再经高速搅拌混合还可以改善浸膏粉体的吸湿性,且其所得粒子表面二氧化硅含量更高,改善原理可能与改性剂附着于粉体表面有关。

Improvement of powder flowability and hygroscopicity of traditional Chinese medicine extract by surface coating modification technology

To study the improvement of powder flowability and hygroscopicity of traditional Chinese medicine extract by surface coating modification technology. The 1% hydrophobic silica nanoparticles were used as surface modifier, and andrographis extract powder was taken as a model drug. Three different techniques were used for coating model drugs, with angle of repose, compressibility, flat angle and cohesion as the comprehensive evaluation indexes for the powder flowability. The powder particle size and the size distribution were measured by Mastersizer 2000. FEI scanning electron microscope was used to observe the surface morphology and structure of the powder. The percentage of Si element on the powder surface was measured by energy dispersive spectrometer. The hygroscopicity of powder was determined by Chinese pharmacopoeia method. All of the three techniques can improve the flowability of powder extract. In particular, hygroscopicity of extract powder can also be improved by dispersion and then high-speed mixing, which can produce a higher percentage of Si element on the powder surface. The improvement principle may be correlated with a modifier adhered to the powder surface.