Fan Changjiang
,
Wang Dong-An
材料科学技术（英文）
doi:10.1016/j.jmst.2016.04.009
In this study, we develop the gelatin-dopamine (Gel-Dopa) nano-gels (GDNGs) and explore their potential as drug delivery vehicles. The Gel-Dopa precursor is synthesized using EDC/NHS coupling reaction, in which the catechols can coordinate with transition metal ions such as Fe3+. These novel GDNGs exhibit excellent cytocompatibility. The model drug, doxorubicin (Dox), is readily conjugated into catechol of GDNGs by the coordination cross-link of Fe3+ ion. The morphology and size distribution of the nano-gels are characterized via field emission scanning electron microscopy and particle size analyzer, respectively. The GDNGs loaded with Dox (GDNGs-Dox) is capable of efficiently penetrating cell membrane and enter the HeLa cells. The endocytosed GDNGs-Dox release Dox molecules and subsequently kill the tumor cells.
关键词:
Gelatin
,
Dopamine
,
Doxorubicin
,
Coordination interaction
,
Drug delivery
郭聪秀
,
王云伟
,
童希立
,
郭向云
新型炭材料
利用湿化学法制备出化程度不同的多壁碳纳米管，并采用红外光谱仪、X-射线光电子能谱仪、透射电子显微镜分析样品因氧化程度不同而引起的表面特征差异。通过循环伏安法和示差脉冲伏安法研究多巴胺，尿酸和抗坏血酸在氧化程度不同的碳纳米管修饰玻碳电极上的电化学行为。其中，样品MWNCTs-R修饰的玻碳电极与其它样品相比，不仅展现出对多巴胺，尿酸和抗坏血酸更好的电催化性能，而且解决了氧化峰相互重叠的问题，可以用于在尿酸和抗坏血酸共存的条件下检测多巴胺。同时，传感器的响应电流随着多巴胺含量的增加而线性增大，线性范围为2~100μM。结果表明，不同氧化程度导致碳纳米管表面的组成和形貌不同，表面含有羧基，并保持完整石墨层结构的碳纳米管对多巴胺有更好的电催化响应。
关键词:
多壁碳纳米管
,
多巴胺
,
脉冲伏安法
,
电催化
