Srinatha A, Pandit Jayanta K
Department of Pharmaceutics, Institute of Technology, Banaras Hindu University, Varanasi, India.
Drug Deliv. 2008 Mar-Apr;15(3):193-9. doi: 10.1080/10717540801952654.
In the present study, we addressed the factors modifying ciprofloxacin release from multiple coated beads. Beads were prepared by simple ionic cross-linking with sodium tripolyphoshate and coated with alginate and/or chitosan to prepare single, double, or multilayered beads. The water uptake capacity depended on the nature of beads (coated or uncoated) and pH of test medium. The number of coatings given to the beads influenced ciprofloxacin release rate. The coating significantly decreased the drug release from the beads in comparison to uncoated beads (p < 0.001). When the beads were given three coatings, viz., alginate, chitosan, and again alginate, the drug release appeared to follow the pattern exhibited by colon-targeted drug delivery systems with time dependent release behavior. The increase in coating formed a barrier for easy ingress of dissolution medium into the bead matrix, reducing the diffusion of drug.
在本研究中,我们探讨了影响环丙沙星从多层包衣微丸中释放的因素。微丸通过与三聚磷酸钠进行简单的离子交联制备,并分别用海藻酸盐和/或壳聚糖包衣,以制备单层、双层或多层微丸。吸水性取决于微丸的性质(包衣或未包衣)以及测试介质的pH值。微丸的包衣层数影响环丙沙星的释放速率。与未包衣微丸相比,包衣显著降低了药物从微丸中的释放(p < 0.001)。当微丸进行三层包衣,即海藻酸盐、壳聚糖,然后再次包衣海藻酸盐时,药物释放似乎呈现出结肠靶向给药系统所具有的随时间变化的释放行为模式。包衣层数的增加形成了一道屏障,阻碍了溶出介质轻易进入微丸基质,从而减少了药物的扩散。
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