选择纳米银溶胶材料样本,研究其与大肠杆菌作用的过程、效果和抗菌原理.扫描电子显微镜(SEM)观测显示溶胶液干燥后的颗粒呈球形,激光粒度仪分析发现其粒度D(0.9)为226 nm;并用原子吸收法分析了Ag的溶出量.采用最小抑菌浓度(MIC)方法测试了其最小抑菌浓度值为0.2 mg/mL;配制4种浓度纳米银溶胶悬浮液与大肠杆菌作用,测试不同时间OD600值,结果表明,质量浓度为0.2 mg/mL以上的溶液OD600值都很低,且随时间延长呈下降趋势.对纳米银和大肠杆菌作用混合体进行定型,负染,用透射电镜(TEM)观测其切片前后形貌发现:纳米银处理后的大肠杆菌菌体模糊、破溃、胞内物质流出;切片样品发现了菌内空泡变性.分析认为纳米银溶胶有银溶出,其进入菌体内部,攻击细胞核质,使细菌细胞变性或破溃而死亡.
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