Poly(lactide- co -glycolide)/cyclodextrin (polyethyleneimine) microspheres for controlled delivery of dexamethasone
作者:Sanda Bucatariu、Marieta Constantin、Paolo Ascenzi、Gheorghe Fundueanu
DOI:10.1016/j.reactfunctpolym.2016.08.008
日期:2016.10
water soluble and chemically sensitive bioactive molecules. One of the most important disadvantages of this method is the diffusion of bioactive molecule, during synthesis, from the primary to the secondary aqueous phase, reducing dramatically the encapsulation yield. Therefore, dexamethasone sodium phosphate (DM), a corticosteroid water soluble drug, which is sensitive to degradation, was first complexed
摘要水包油水(w1 / o / w2)溶剂蒸发法是一种包封和保护水溶性和化学敏感的生物活性分子的技术。该方法的最重要的缺点之一是生物活性分子在合成过程中从一级水相扩散到二级水相,从而大大降低了包封率。因此,首先将对降解敏感的皮质类固醇水溶性药物地塞米松磷酸钠(DM)与羟丙基环糊精(HPCD),γ-环糊精(γ-CD)或聚乙烯亚胺(PEI)络合,然后包埋在聚( w1 / o / w2溶剂蒸发法制得的乳酸-乙醇酸共聚物(PLGA)微球。还计算了形成HPCD / DM和γ-CD/ DM包合物的缔合平衡常数,分别为1.420×103 M-1和1.447×104 M-1。PEI被证明是最有效的DM捕集剂,在微球中保留的药物量最高,其次是γ-CD和HPCD。尽管DM与HPCD和γ-CD结合的缔合平衡常数很高,但两种环糊精都不能保护药物免受紫外线照射。微球的形态以及药物的包封效率和释放速率受络合剂和一级水