Preparation of colchicine ethosomes containing TPGS and in vitro transdermal permeation Study on preparation and in vitro transdermal penetration of betulinic acid ethosomes modified by sodium deoxycholate Preparation of ethosomes-based gel of demethylzeylasteral and its transdermal behavior in vitro Entrapment efficiency of podophyllotoxin-encapsulated ethosome by minicolumn centrifugation-HPLC Percutaneous permeation characteristic of podophyllotoxin ethosomes in vitro Investigation on preparation of sinomenine hydrochloride ethosomes and its properties Percutaneous permeation characteristic of podophyllotoxin ethosomes in vitro Preparation and transdermal diffusion of ursolic acid ethosomes Investigation on preparation of sinomenine hydrochloride ethosomes and its properties