Study on factors affecting mucosal permeability of gardenia extract Study on natural borneol and synthetic borneol affecting mucosal permeability of gardenia extract Study on in vitro mucosal permeation properties and factors affecting mucosal permeability of paeonol Study on in vitro mucosal permeation properties and factors affecting mucosal permeability of paeonol Optimization for formulation of Zhi Xiong San thermo-sensitive gel by central composite design-response surface method and study on characterization of its nasal mucosal permeability