encapsulation efficiency, high stability in physiological conditions, and pH responsiveness. Drug-release studies clearly showed that the PtIV prodrug 3 release from Ac-Dex NPs was negligible at pH 7.4, whereas at pH 5.5, this compound was completely released with a controlled rate. Confocal laser scanning microscopy unambiguously showed that the NIR-dye 9/Ac-Dex NPs were efficiently taken up by MCF-7 cells
基于可
生物降解的
乙缩醛葡聚糖聚合物(Ac-Dex)的纳米颗粒(NPs)用于近红外(NIR)成像,并控制Pt IV前药向癌细胞的递送。载有疏
水性Pt IV前药3(Pt IV / Ac-Dex NPs)和新型疏
水性NIR荧光
染料9(NIR
染料9)的Ac-Dex NP/ Ac-Dex NPs,以及与两种化合物共载的Ac-Dex NP(共载Ac-Dex NP),是使用一种
水包油纳米乳液方法组装而成的。动态光散射测量和扫描电子显微镜图像显示,所得Ac-Dex NP是球形的,平均直径为100 nm,它通过增强的渗透和保留效果而适合在肿瘤中蓄积。新的纳米系统显示出高载药能力,高包封效率,在生理条件下的高稳定性和pH响应性。药物释放研究清楚地表明,Pt IV前药3在pH 7.4时,Ac-Dex NPs的释放可忽略不计,而在pH 5.5时,该化合物以受控的速率完全释放。共聚焦激光扫描显微镜清楚地表明,NIR-dye