Metal sulfide quantum dots-aggregated PAMAM dendrimer for cadmium ion-selective electrode-based immunoassay of alpha-fetoprotein

被引:0
作者
Qunfang Li
Jing Jin
Fangming Lou
Dianping Tang
机构
[1] Hubei University for Nationalities,School of Chemistry and Environmental Engineering
[2] Fuzhou University,Key Laboratory for Analytical Science of Food Safety and Biology of Ministry of Education, Fujian Province, State Key Laboratory of Photocatalysis on Energy and Environment, Department of Chemistry
来源
Science China Chemistry | 2018年 / 61卷
关键词
potentiometric immunoassay; metal sulfide quantum dot; PAMAM dendrimer; alpha-fetoprotein; ion-selective electrode; cancer biomarker;
D O I
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中图分类号
学科分类号
摘要
An ion-selective electrode (ISE)-based immunoassay has been innovatively designed for the sensitive detection of liver cancer biomarker (alpha-fetoprotein, AFP), using metal sulfide quantum dot (QD)-based nano labels. CdS QDs-aggregated PAMAM dendrimer (QD-DE) was first synthesized and functionalized with polyclonal rabbit anti-human AFP antibodies. Thereafter, a sandwich immunoreaction was implemented on monoclonal mouse anti-human AFP antibody-coated microplate by using antibody-functionalized QD-DE as the secondary antibody. Accompanying the immunocomplex, subsequent potentiometric detection of cadmium ion dissolved from the QD-DE under acidic condition was conducted on a portable cadmium ion-selective electrode (Cd-ISE). Results revealed that the electrode potential of the Cd-ISE increased with the increment of AFP concentration from 0.1 to 100 ng mL−1 at a detection limit (LOD) of 68 pg mL−1. The relative standard deviations (RSD) were below 9.09% and 10.54% for the intra- and inter-assay, respectively. Additionally, six human serum specimens were determined on Cd- ISE-based immunosensor by using commercial human AFP ELISA kit as the reference, and gave good relationship between two methods. Importantly, Cd-ISE-based immunoassay offers the promise for simple and cost-effective screening of disease-related biomarkers.
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页码:750 / 756
页数:6
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