以胃癌细胞系BGC-823为研究对象,采用倒置相差显微镜观察纳米TiO2光催化氧化前后BGC-823细胞形态的变化,通过流式细胞仪考察其对BGC-823细胞凋亡率及细胞周期的影响.结果表明,纳米TiO2光催化氧化使BGC-823细胞呈受激坏死或凋亡晚期继发性坏死状态；导致BGG-823细胞周期阻滞于G2/M期并诱导细胞凋亡,从而抑制其DNA合成及增殖分化进程.当TiO2比负载量为9.8×10-7g/cm2、光照时间为40min时,G2/M期阻滞较为显著,细胞凋亡率达24.34％.
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