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Position: Home > Articles > A Label-free Electrochemical Immunosensor Based on Multifunctional Gold Nanoparticles and Magnetic Nanocomposite for Determination of α-fetoprotein Journal of Shihezi University(Natural Science) 2014,32 (6) 731-736

基于聚多巴胺膜包覆的磁性纳米复合材料构建的新型免疫传感器研究

作  者:
潘伯广;陈晓玉;赵云;洪成林
单  位:
石河子大学化学化工学院/新疆兵团化工绿色过程重点实验室/省部共建国家重点实验室培育基地
关键词:
纳米Fe3O4;普鲁士蓝;纳米金;甲胎蛋白;免疫传感器
摘  要:
本文为探讨构建有较高的选择性和稳定性及灵敏性的用于检测甲胎蛋白(AFP)的新型非标记电流型免疫传感器。本实验采用基于多巴胺的自聚合反应,在PB-Fe3O4表面形成聚多巴胺膜,置于氯金酸溶液中修饰纳米金,制得具有富磁性纳米复合材料-纳米金/聚多巴胺/普鲁士蓝/四氧化三铁(Au-Dopa-PB-Fe3O4);将纳米复合材料滴涂于玻碳电极表面,利用纳米金将甲胎蛋白抗体固定化,并用牛血清白蛋白(BSA)封闭电极表面非特异结合位点,构建出一种新型甲胎蛋白免疫传感器。结果显示,该纳米复合材料采用FT-IR、XRD和TEM进行表征,聚多巴胺包覆层能有效增加普鲁士蓝稳定性,并为电极表面保持免疫蛋白的活性提供了良好的微环境,同时,纳米金具有很好的生物相容性及比表面积,能增加免疫蛋白的固载数量,从而增强免疫传感器的灵敏度。由此可知,在优化条件下,免疫传感器对甲胎蛋白的检测范围为0.05 ng~30 ng/m L检出限为0.02 ng/m L。此外,该免疫传感器表现出较高的选择性和稳定性及灵敏性。
译  名:
A Label-free Electrochemical Immunosensor Based on Multifunctional Gold Nanoparticles and Magnetic Nanocomposite for Determination of α-fetoprotein
作  者:
PAN Boguang;CHENG Xiaoyu;ZHAO Yun;HONG Chenglin;Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan/School of Chemistry and Chemical Engineering,Shihezi University;School of Pharmacy,Shihezi University;
关键词:
ferroferric oxide;;Prussian Blue;;polydopamine;;gold nanoparticles
摘  要:
A simple and highly sensitive amperometric immunosensor for the determination of alpha-fetoprotein(AFP) based on gold nanoparticles-polydopamine-Prussian Blue-ferroferric oxide(Au-Dopa-PB-Fe3O4) nanocomposites was fabricated.Fe3O4-PB nanoparticles were prepared by magnetic separation method and it was surface functionalized by one-step oxidative polymerization of dopamine in basic solution at environment friendly condition to obtain the polydopamine(Pdop) modified PBFe3O4 nanoparticles.Then,via in situ deposition,the Au NPs deposited on the polydopamine functionalized PB-Fe3O4 nanocomposites.The as-prepared Au-Dopa-PB- Fe3O4 nanocomposites not only enhance the stability of Prussian blue and provided a favorable microenvironment to maintain the activity of the immobilized biomolecules due to the excellent biocompatibility of Dopa,but also increased the loading capacity of the biomolecules due to the large surface area of nanocomposites,and the presence of gold nanoparticles enhanced the conductivity and charge-transport properties of the composites.The dynamic range of the resulted immunosensor for the detection of AFP is from 0.05 ng/mL to 30.0 ng/mL with a detection limit of 0.02 ng/mL(S/N = 3).Moreover,this biosensor displays good selectivity,stability and reproducibility.

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