Objective To optimize the drying process of Shujin Tongluo extract. Methods Microwave drying equipment was used.4 drying methods, namely decompression drying, drying and spray drying, were used to dry the extract of Shu Jin Tong Luo. The yield of dry paste, the solubility of the granules, naringin and gastrodin content were determined. The moisture absorption percentage of the granules was determined, and the hygroscopic time curve was drawn to compare the hygroscopicity of the granules.
Results the relative moisture absorption rate and the equilibrium moisture content of Shu Jin Tong Luo granules from 4 drying methods were small and large in order of decompression drying, microwave drying, spray and drying. Conclusion The best drying method of Shujin Tongluo extract is decompression drying.
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