Preparation of tripterine-loaded nanostructured lipid carrier and its in vitro transdermal absorption Preparation of tripterine-loaded nanostructured lipid carrier and its in vitro transdermal absorption Study on in vitro transdermal absorption properties of active fraction from Xiangfu Siwu Decoction Study on in vitro transdermal absorption of rhubarb free anthraquinones in Dasuan Xiaohuang Pasta