检出限
安培法
纳米复合材料
纳米棒
电化学
过氧化氢
选择性
胺气处理
化学工程
化学
材料科学
纳米纤维
涂层
电极
催化作用
纳米技术
色谱法
有机化学
物理化学
工程类
作者
Hongfang Zhang,Lina Ma,Pengli Li,Jianbin Zheng
标识
DOI:10.1016/j.bios.2016.04.100
摘要
A hybrid nanostructure of Fe3O4 nanospheres and [email protected] nanorods prepared by polydopamine coating was utilized as nanoelectrocatalyst to construct a novel sandwich-type electrochemical immunosensor. [email protected]3O4 nanohybrid modified electrode exhibited much better electrocatalytic activity toward the reduction of hydrogen peroxide than Fe3O4 nanospheres or [email protected] nanorods due to the synergetic catalytic effect. The immunosensor was prepared by immobilizing the capture antibodies on the amine-terminated nanocomposite of carbon nanofibers-chitosan, whilst the trace tag was prepared by loading detection antibodies on the [email protected]3O4 nanocomposite. After the parameter optimization, the amperometric signal increased linearly with human IgG concentration in the broad range of 0.1 pg mL−1 to 5 μg mL−1 with a detection limit of 50 fg mL−1. Meanwhile, the enzyme-free catalyst based immunosensor also showed acceptable selectivity, reproducibility and stability.
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