中文摘要：

在玻碳电极表面电聚合2,6-二氨基吡啶（pPA）,利用硫堇（Thi）、纳米金（nano-Au）固载癌胚抗体,制得稳定性好、灵敏度较高、线性范围宽的电流型免疫传感器.通过循环伏安法考察了该免疫传感器的电化学特性,在优化的实验条件下,该免疫传感器的峰电流随着检测溶液中癌胚抗原（CEA）浓度的增大而减小,并在0.5～20和20～160ng/mLCEA范围内呈现出良好的线性关系,检测下限为0.2ng/mL.该免疫传感器具有制作简单、重现性好、线性范围宽等优点,可用于临床上对CEA的检测.

英文摘要：

The poly 2,6-pyridinediamine （pPA） film was formed on the glassy carbon electrode by utilizing electropolymerization, which yielded an interface with amine groups for the assembly of thionine （Thi） and colloidal Au. The electrochemical characteristics of the immunosensor were studied by cyclic voltammetry. The factors influencing the performance of the resulting biosensor were studied in detail. Under the optimized conditions, the current response of the proposed immunosensor decreased linearly in two concentra- tion ranges of CEA from 0.5 to 10 ng/mL and from 10 to 120 ng/mL with a detection limit of 0.2 ng/mL. Moreover, the studied immunosensor exhibited simple fabrication, good reproducibility and a broad linear range, which made it potentially application for determination of CEA in clinical analysis.