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Objective To Study the in vitro and in vivo transdermal properties of 8-MOP microemusion and its microemulsion-based hydrogel.Method The 8-MOP microemusion and 8-MOP microemulsion-based hydrogel were determined using a modified Franz-type diffusion cell fitted with abdominal skin of excised anthony pig.Femal rats were used as experimental model and in vivo transdermal study of 8-MOP ME, MBH and commercially available solution were performed.After topical administrated preparation, blood samples were withdrawn from the fossa orbitalis of rats at predetermined time intervals, and after last blood sampled, cut off skin.8-MOP in rat plasma and skin was determined by HPLC.