Indexed by:期刊论文
Date of Publication:2014-03-01
Journal:TALANTA
Included Journals:SCIE、EI、PubMed
Volume:120
Page Number:218-223
ISSN No.:0039-9140
Key Words:Electrochemical immunosensor; Signal amplification; Hybridization chain reaction; Carcinoembryonic antigen; Hexaammineruthenium
Abstract:An ultrasensitive enzyme-free electrochemical immunoassay was developed for detection of the fg/mL level carcinoembryonic antigen (CEA) by using a double strand DNA@Au nanoparticle (dsDNA@AuNP) tag and hexaammineruthenium(III) chloride (RuHex) as the electroactive indicator. The dsDNA@AuNP was synthesized by one-pot hybrid polymerization of dsDNA on initiator DNA modified AuNPs via hybridization chain reaction. The immunosensor was prepared by covalently cross-linking capture antibody on chitosan/AuNP nanocomposite modified glass carbon electrode. The AuNPs accelerated the electron transfer and led to high detection sensitivity. With a sandwich-type immunoreaction and a biotin-streptavidin affinity reaction, the dsDNA@AuNP tag was conjugated on the immunocomplex to bring a high amount of RuHex to the electrode surface via electrostatic interaction, resulting in an amplified electrochemical signal. Under optimal conditions, the proposed sensing platform showed a wide linear detection range from 10 fg/mL to 10 ng/mL along with a detection limit of 3.2 fg/mL for CEA. The immunosensor exhibited high sensitivity and good stability, showing a promising application in early cancer diagnosis and could be extended to sensitive electrochemical biosensing of other analytes. (C) 2013 Elsevier B.V. All rights reserved.
Professor
Supervisor of Doctorate Candidates
Supervisor of Master's Candidates
Main positions:化学学院副院长
Other Post:辽宁省教学名师,宝钢优秀教师特等奖提名奖,中国分析测试学会青年学术委员会委员
Gender:Female
Alma Mater:南京大学
Degree:Doctoral Degree
School/Department:化学学院
Discipline:Analytical Chemistry. Biochemistry and Molecular Biolog
Business Address:化工综合楼C305
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