以2-硫代巴比妥酸(TBA)修饰金纳米粒子为探针,TBA与三聚氰胺通过氢键作用诱导金纳米探针团聚,进而使金纳米胶体颜色由酒红色变为蓝色.实验优化得最佳反应条件为在乙酸缓冲溶液(pH=7.0)介质中,室温反应15 min.对不同浓度三聚氰胺进行检测时发现,在0.062～0.18 μmol/L和0.18～6.0μmol/L之间,A660/A520吸收比率与三聚氰胺浓度呈现良好的线性关系,检出限为0.043 μmol/L.该方法用于检测牛奶样品中的三聚氰胺的加标回收率为102.8％～ 105.3％.
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