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Enhanced electrochemical biosensing on gold electrodes with a ferri/ferrocyanide redox couple

Authors
Lee, SeowonKim, Won JaeChung, Minsub
Issue Date
7-Sep-2021
Publisher
ROYAL SOC CHEMISTRY
Citation
ANALYST, v.146, no.17, pp.5236 - 5244
Journal Title
ANALYST
Volume
146
Number
17
Start Page
5236
End Page
5244
URI
https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/16175
DOI
10.1039/d1an00952d
ISSN
0003-2654
Abstract
Detection of specific DNA is important in many fields. Label-free DNA sensing performed by electrochemical impedance spectroscopy (EIS) or using a quartz crystal microbalance (QCM) is widely employed for this purpose. Gold electrodes are mainly used for these techniques due to their chemical stability. However, ferro/ferricyanide used as a redox couple was found to etch the gold electrode and this significantly limited the repeatability of the EIS measurement. Inductively coupled plasma mass spectrometry (ICP-MS) and QCM experiments provided important clues about the gold dissolution mechanism and revealed that phosphate buffer promotes the dissolution of gold in the presence of the ferri/ferrocyanide redox couple. Tris buffered conditions, which provide the most stable environment, enabled the investigation of experimental parameters with a Q-sense electrochemistry module (QEM), which can perform QCM and EIS measurements simultaneously and revealed the principal factors that influence changes in the impedance. With the reproducible measurements, the estimation of an optimum probe-DNA concentration for detecting complementary DNA is demonstrated. In order to amplify the detection signal of target DNA, we sought to maximize the difference in response between the probe-only and target DNA by controlling the concentration of probe DNA. We showed that an intermediate probe-DNA concentration yields optimum signal amplification.
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