Preparation of sinomenine hydrochloride κ-carrageenan /konjac glucomannan matrix tablets and study on its in vitro release mechanism Studies on drug release from aminophylline konjac glucomannan matrix tablet Preparation of total gambogic acid hydrophilic matrix tablet and its in release Study on application of bioassay method in drug-release evaluation in vitro of Salvia miltiorrhiza hydrophilic gel matrix tablets Preparation of hydrophilic matrix sustained release tablets of total lactones from Andrographis paniculata and study on its in vitro release mechanism Preparation of total gambogic acid hydrophilic matrix tablet and its in vitro release