作者:Ashim K. Mitra、Thomas J. Mikkelson
DOI:10.1002/jps.2600770911
日期:1988.9
The mechanism of transcorneal permeation of pilocarpine has been investigated in relation to the physicochemical properties of the permeating species and its interaction with the membrane biophase. In vitro corneal transport experiments suggested the transport of un-ionized as well as ionized pilocarpine species across the corneal membrane. However, the permeability of the ionized pilocarpine species
已经研究了毛果芸香碱经角膜渗透的机制,涉及渗透物种的理化特性及其与膜生物相的相互作用。体外角膜转运实验表明,未电离的和电离的毛果芸香碱物质可通过角膜转运。但是,电离的毛果芸香树种的渗透率是4.818 x 10(-6)cm s-1,仅为未电离的毛果芸香树种的渗透率的一半(9.744 x 10(-6)cm s-1 )。通过检查季铵化的毛果芸香碱化合物(即毛果芸香碱甲基碘)的转运,可以获得离子跨角膜转运的进一步证据。季铵化的化合物的角膜通透性为4.66 x 10(-6)cm s-1,与离子化毛果芸香树种获得的通透性相似。角膜的脂质上皮层似乎是极性物质运输的主要障碍。因此,毛果芸香碱阳离子跨脂质体上皮的运输可能是与磷酸二氢盐和/或硝酸盐抗衡离子紧密结合的离子对。毛果芸香碱角膜通透性与1-辛醇-水分配系数之间的线性关系良好,是毛果芸香碱电离状态的函数。对于具有较高的1-辛醇-水分配系数的药物,跨角膜