Comparison of essential oil from Mentha haplocalyx and menthol used as penetration enhancers Sinomenine hydrochloride ethosome preparation and its transdermal penetration Sinomenine hydrochloride ethosome preparation and its transdermal penetration Effect of terpene penetration enhancer and its mechanisms on membrane fluidity and potential of HaCaT keratinocytes Association between chemical composition of essential oil with penetration enhancement effect and drug properties of traditional Chinese medicine Preparation of perillyl alcohol ointment and investigaion on its in vitro transdermal penetration Study on preparation and in vitro transdermal penetration of betulinic acid ethosomes modified by sodium deoxycholate