Objective To investigate the effects of fluidized bed granulation with dextrin on moisture sorption and diffusion of Zexie Decoction granules. Methods The particle characterization was studied by the particle size, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and Fourier transform infrared (FTIR). The moisture sorption isotherm, equilibrium moisture content (EMC), and moisture diffusion coefficients were determined by using the saturated salt solution method. Results The particle size increased from 6.04 μm (powder) to 1201.47 μm (granule). The glass transition temperature of dextrin, Zexie Decoction powder, and granule was 107.13 oC, 94.82 oC, and 126.25 oC. As the increase of temperature, the initial rate of moisture sorption become higher. Furthermore, the initial rate of moisture sorption of Zexie Decoction granules was lower than those of powders and dextrin. The EMC and moisture diffusion coefficients were reduced significantly after granulation (p<0.01). Critical relative humidity and diffusion activation energy of granules were higer than powders. Conclusion Results suggested that fluidized bed granulation with dextrin could reduce the hygroscopicity of the Zexie Decoction extract powders and inhibite moisturediffusion, which is mainly related to the microstructure reorganization by fluidized bed granulation and anti-plasticizing effects of dextrin.
关键词:
泽泻汤颗粒剂;流化床;防潮;扩散系数
Keywords:
Project Supported:
Tianjin Municipal Education Commission Research Project (Grant No. 2017KJ134)
Peng-jun Han, Zhi-feng Xue, Li-na Zhang, Bing Zhang, Dong-li Qi, Jia-xin Pi, Nan Li, Pan Guo, Zhi-dong Liu . Moisture sorption and diffusion determination of Chinese Herbal Granules: moisture-resistant effects of fluidized bed granulation with dextrin[J]. Chinese Herbal Medicines (CHM),2018,10(3):290-297
