Au改性TiO2纳米复合物对人结肠癌细胞的光催化杀伤作用

Photocatalytic Killing Effect of Gold-doped TiO_2 Nanocomposites on Human Colon Carcinoma LoVo Cells

提出了通过TiO2表面修饰纳米Au的方法来提高纳米TiO2光催化杀伤癌细胞的效率.采用化学还原法合成了Au改性的TiO2(Au/TiO2)纳米复合物,并研究了不同掺杂量(1wt%,2wt%,4wt%)的Au/TiO2对人结肠癌LoVo细胞的光催化杀伤效应.结果显示,Au的掺杂大大地提高了TiO2纳米粒子光催化杀伤结肠癌LoVo细胞的效率,而且Au掺杂量的高低影响Au/TiO2光催化杀伤癌细胞的效率,掺金量为2%的Au/TiO2对结肠癌LoVo细胞具有最高的光催化杀伤效率.在光强为1.8mW/cm2的紫外灯(λmax=365nm)下光照110min,50μg/mL掺金量为2%的Au/TiO2能够杀死所有的癌细胞,而同样浓度的TiO2只能杀死70%的癌细胞。

Gold-doped TiO2 （Au/TiO2） nanocomposites were utilized to improve the photocatalytic inactivation effect on human colon carcinoma LoVo cells. The Au/TiO2 samples doped with different amounts of Au （1 wt%, 2 wt%, 4 wt%） were prepared by a chemical reduction method and used to photokill the LoVo cells. It was found that the photocatalytic inactivation effect of the TiO2 nanoparticles on LoVo cancer cells could be greatly improved by the surface modification of Au nanoparticles. Furthermore, the loading amount of Au on the surface of the TiO2 nanoparticles affected the photocatalytic inactivation efficiency strongly, and it was observed that the most efficient sample was 2 wt% Au/TiO2. Under the irradiation of UV light （λmax=365 nm, intensity= 1.8 mW/cm^2） for 110 rain, all of the LoVo cancer cells were killed by 50 μg/mL 2 wt% Au/TiO2. But for 50 μg/mL TiO2 nanoparticles, only 70% cancer cells could be killed under the same condition.