Optimization of ultrafiltration technology for water extract in Cornus officinalis Correlation of powder particle size, cell wall-breaking, rate and in vitro dissolution rate of Liuwei Dihuang Pill Simultaneous determination of nine kinds of active components in Hugan Agent by RP-HPLC High performance capillary electrophoresis fingerprint of Corni Fructuspieces Comparative study on decoction and dissolution of crude and processed Corni Fructus