[Comparative study on rat in situ nasal absorption of geniposide of Xingnaojing nasal drop and Xingnaojing microemulsion].

Xingnaojing (XNJ) is an effective clinical drug used to treat acute stroke. Compared with injection administration, its nasal administration has better brain targeting. Therefore, through nasal administration, XNJ microemulsion could help solve the drug load of compound components of different polarities contained in large-dose and high-concentration traditional Chinese medicines, and reduce irritation to nasal mucosa In this study, the modified volume correction method and the improved rat in situ nasal perfusion model were adopted to compare the nasal absorption of geniposide contained in different XNJ preparations. The results showed that the constant absorption rate of geniposide (GE) in XNJ-D was (2.95 +/- 0.25) x 10(-3) min(-1), whereas the constant absorption rate of GE in XNJ-M was (2.16 +/- 0.21) x 10(-3) min(-1). This indicated that the rat nasal absorption of GE in different XNJ preparations complied with the first-order process and could be considered as passive absorption. GE in XNJ-D was absorbed faster than that in XNJ-M, which provided basis for the development of nasal preparations of XNJ.