Electrochemical sandwich immunoassay for insulin detection based on the use of gold nanoparticle-modified MoS2 nanosheets and the hybridization chain reaction View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2018-12-07

AUTHORS

Huidan Sun, Shaoyan Wu, Xiaoyan Zhou, Min Zhao, Haiping Wu, Rong Luo, Shijia Ding

ABSTRACT

A sandwich-type of electrochemical immunoassay is described for the determination of insulin. It is based on the use of a glassy carbon electrode that was modified with MoS2 nanosheets decorated with gold nanoparticles (AuNPs) to immobilize a large amount of first antibody (Ab1). Following exposure to insulin, secondary antibody (Ab2) that was cross-linked to a DNA initiator strand (T0) to form an Ab2@T0 conjugate was added to undergo a sandwich immunoreaction. Subsequently, the long dsDNA concatemer was formed by a hybridization chain reaction between Ab2@T0 and auxiliary probes (H1, H2). Finally, the electrochemical probe ruthenium(II) hexaammine was intercalated into the dsHCR products via electrostatic interaction between the anionic DNA phosphate backbones and the cationic probe. The electrochemical response, best measured at a potential of around −0.21 V (vs Ag/AgCl) has a dynamic range that extends from 0.1 pmol L−1 to 1 nmol L−1 insulin, and the detection limit is as low as 50 fmol L−1. The assay was acceptably specific, reproducible and stable. In our perception, it represents a viable new tool for determination of this important clinical parameter.Graphical abstractSchematic of a sandwich-type of electrochemical immunoassay for the determination of insulin based on the use of MoS2 nanosheets modified with gold nanoparticles (AuNP@MoS2) and hybridization chain reaction (HCR). More... »

PAGES

6

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00604-018-3124-8

DOI

http://dx.doi.org/10.1007/s00604-018-3124-8

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1110448684

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30535591


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