Research on micro-silica gel used for powder modification of Angelicae Dahuricae Radix extract and its mechanism of promoting disintegration of Yuanhu Zhitong Dispersible Tablets Research on micro-silica gel used for powder modification of Angelicae Dahuricae Radix extract and its mechanism of promoting disintegration of Yuanhu Zhitong Dispersible Tablets Study on powder modification technology for Chinese materia medica characteristics Revalidation of key role of water absorption in disintegration process of Chinese materia medica dispersible tablets:Exemplifying by Jianghuang Qingzhi Dispersible Tablets Optimization of modifiers and process for changing superficial hydrophilicity of Indigo Naturalis