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目的应用量子点纳米荧光探针示踪中药有效成分与细胞之间的直接作用,为该技术成为一种研究平台提供实验依据。方法丹酚酸B(salvianolic acid B,SAB)经1-乙基-3(3-二甲基胺基丙基)碳二亚胺盐酸盐[1-ethyl-3(3-dimethylamino propyl)-carbodiimide,EDC]活化,以巯基乙胺(mercaptoethylamine,ME)为连接剂,与水溶性量子点(quantum dots,QDs)进行共价连接,将获得的QDs-SAB与肺腺癌细胞(SPCA-1)和肝癌细胞(7721)进行培育,通过QDs荧光直接观察SAB与细胞的结合情况,进而根据细胞形态观察、MTT和DNA电泳结果考察SAB是否对这些细胞有作用。结果QDs可清晰地示踪SAB与SPCA-1和7721细胞之间结合情况,通过常规方法首次证实了SAB对这两种细胞有增殖抑制作用。结论应用量子点纳米荧光探针直观发现中药有效成分与细胞之间的作用是可行的。 相似文献
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Drug-loaded microspheres are usually used as a biophysically targeted delivery system. The morphology and size distribution of the microspheres are key effects on the efficiency in therapy. The microspheres could be prepared by the spray drying method, and the characterization could be controlled by varying the drying conditions. The whole preparation process is highly efficient, and suitable for commercialization. In this work, a case for preparation of the microspheres of tanshinone (TAN) solid dispersions was studied, and the mechanisms of morphology and size control of microspheres during the spray drying process were investigated. The effects of inlet temperature, concentration and components of precursors, and feed rate on the morphology and size distribution of products were studied. The results showed that the morphology of the dry products depended on the inlet temperature, the components of precursor and feed rate. Among them, temperature was the most important factor. The size of microspheres was mainly controlled by the concentration of the precursor. This work might be a reference for morphology and size control of targeted drug delivery microspheres by the spray drying method. 相似文献
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