建立了一种用聚乙二醇单甲醚稳定的纳米金(PEO-纳米金)可视化检测丙烯酰胺(AM)的新方法,并用透射电子显微镜镜、紫外可见光光度计、激光粒度分析仪对PEO-蚋米金进行测试分析.结果表明,该PEO-纳米金金核为19 nm的规则球体且分散均匀,颗粒整体(纳米金金核和表面稳定剂)粒径集中分布在40 nm.浓度为0.004 mg/mL的丙烯酰胺可使该PEO-纳米金发生团聚,胶体由红色变成紫色,浓度在0.004~0.032 mg/mL之间时,团聚程度随浓度的增加而增加,同时颗粒整体粒径依次增大到170 nm,250 nm,600 nm.而N,N-二甲基丙烯酰胺(DMAA)在相同条件下不能使PEO-纳米金发生团聚.因此,可用该方法简单、快速地实现丙烯酰胺选择性检测.
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