A label-free electrochemical immunosensor for the detection of cardiac marker using graphene quantum dots (GQDs)

Title
A label-free electrochemical immunosensor for the detection of cardiac marker using graphene quantum dots (GQDs)
Author
송충길
Keywords
Graphene quantum dots; Myoglobin; Electrochemical Impedance Spectroscopy; Label-free immunosensor; Cardiac marker
Issue Date
2016-12
Publisher
ELSEVIER ADVANCED TECHNOLOGY
Citation
BIOSENSORS & BIOELECTRONICS, v. 86, Page. 548-556
Abstract
A label-free immunosensor based on electrochemical impedance spectroscopy has been developed for the sensitive detection of a cardiac biomarker myoglobin (cMyo). Hydrothermally synthesized graphene quantum dots (GQDs) have been used as an immobilized template on screen printed electrodes for the construction of an impedimetric sensor platform. The GQDs-modified electrode was conjugated with highly specific anti-myoglobin antibodies to develop the desired immunosensor. The values of charge transfer resistance (R-ct) were monitored as a function of varying antigen concentration. The R-ct value of the immunosensor showed a linear increase (from 0.20 to 0.31 k Omega) in the range of 0.01-100 ng/mL cMyo. The specific detection of cMyo was also made in the presence of other competing proteins. The limit of detection for the proposed immunosensor was, estimated as 0.01 ng/mL which is comparable to the standard ELISA techniques. (C) 2016 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0956566316306819?via%3Dihubhttp://repository.hanyang.ac.kr/handle/20.500.11754/101684
ISSN
0956-5663; 1873-4235
DOI
10.1016/j.bios.2016.07.052
Appears in Collections:
RESEARCH INSTITUTE[S](부설연구소) > ETC
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