催化发夹组装诱导的金纳米颗粒聚集比色检测卡那霉素

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建立了基于催化发夹组装诱导的金纳米颗粒聚集检测卡那霉素的方法.利用卡那霉素与适配体的特异性结合释放出引发链,引发吸附于金纳米颗粒表面的催化发夹组装,形成大量双链结构,导致金纳米颗粒在高盐浓度条件下发生聚集.通过凝胶电泳和透射电镜对催化发夹组装和金纳米颗粒的聚集进行了表征并对实验条件进行了优化.结果 表明,37℃条件下,发夹探针浓度为160 nmol/L,NaCl浓度为20 mmol/L时,方法的线性检测范围为4.0~160 nmol/L,检测限为1.6 nmol/L.将该方法用于牛奶样品中卡那霉素的加标回收实验,回收率为97.5% ~ 109.0%,相对标准偏差在1.9% ~3.0%之间.
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