毒理性
为了研究冰片对具有不同亲水性和分子大小的化合物经角膜透过性的增强效果。选择了六种化合物作为模型药物,分别是罗丹明B、荧光素钠、异硫氰酸荧光素(FITC)葡聚糖4、10、20和40 kDa。透过性研究使用兔眼角膜离体样本,通过Franz型扩散装置进行。评估冰片的安全性基于角膜水合水平和Draize眼刺激性试验。将0.2%冰片应用于角膜,使罗丹明B、荧光素钠、4和10 kDa FITC-葡聚糖的表观透过系数分别增加了1.82倍(p<0.05)、2.49倍(p<0.05)、4.18倍(p<0.05)和不显著地1.11倍。与对照组相比,10、20和40 kDa FITC-葡聚糖与冰片没有显著透过性增强。0.2%冰片增强的透过系数与模型药物的分子量呈线性相关(R(2)=0.9976)。应用0.05%、0.1%和0.2%冰片后,角膜水合值小于83%,Draize评分小于4。冰片可能改善亲水性和疏水性化合物的经角膜渗透,而不引起毒性反应,尤其是亲水性化合物。此外,0.2%冰片可以增强分子量小于或等于4 kDa的亲水性化合物的透过性。因此,冰片可以被认为是一种安全有效的眼用药物渗透增强剂。
To investigate the enhancing effect of borneol on transcorneal permeation of compounds with different hydrophilicities and molecular sizes. Six compounds, namely rhodamine B, sodium-fluorescein, fluorescein isothiocyanate (FITC) dextrans of 4, 10, 20 and 40 kDa were selected as model drugs. Permeation studies were performed using excised cornea of rabbits by a Franz-type diffusion apparatus. The safety of borneol was assessed on the basis of corneal hydration level and Draize eye test. The application of 0.2% borneol to the cornea increased the apparent permeability coefficient by 1.82-(p<0.05), 2.49-(p<0.05), 4.18-(p<0.05), and 1.11-fold (not significant) for rhodamine B, sodium-fluorescein, FITC-dextrans of 4 and 10 kDa, respectively. No significant permeability enhancement of FITC dextrans of 10, 20 and 40 kDa with borneol was found compared to control. The permeability coefficient enhanced by 0.2% borneol was linear correlated to the molecular weight of model drugs (R(2)=0.9976). With the 0.05%, 0.1% and 0.2% borneol application, the corneal hydration values were <83% and Draize scores were <4. Borneol may improve the transcorneal penetration of both hydrophilic and lipophilic compounds without causing toxic reactions, especially hydrophilic ones. Furthermore, 0.2% borneol can enhance the permeation of hydrophilic compounds with molecular weight </= 4 kDa. Hence, borneol can be considered as a safe and effective penetration enhancer for ocular drug administration.
来源:Hazardous Substances Data Bank (HSDB)