S&M Young Researcher Paper Award 2020
Recipients: Ding Jiao, Zao Ni, Jiachou Wang, and Xinxin Li [Winner's comments]
Paper: High Fill Factor Array of Piezoelectric Micromachined
Ultrasonic Transducers with Large Quality Factor

S&M Young Researcher Paper Award 2021
Award Criteria
Notice of retraction
Vol. 32, No. 8(2), S&M2292

Print: ISSN 0914-4935
Online: ISSN 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
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Quantitative Evaluation of DNA Probe Density by Electrochemical Surface Plasmon Resonance Measurement

Takuma Sasaki, Kaori Masuda, Zixin Zhang, Tatsuhiko Yajima, Hijiri Hasegawa, Yeji Kim, and Osamu Niwa

(Received August 10, 2021; Accepted October 25, 2021)

Keywords: surface plasmon resonance, SAM, EC-SPR, electrochemical reductive desorption, DNA sensor

Electrochemical surface plasmon resonance (EC-SPR) measurement enables changes in the surface refractive index induced by an electrochemical reaction to be detected. Here, we applied EC-SPR measurement to quantitatively evaluate a DNA sensor surface, which was constructed by immobilizing thiolated DNA probes onto a gold film surface by a self-assembled-monolayer technique. This is because the performance of the sensor significantly depends on the probe density. Although the probe density can be evaluated quantitatively by measuring the current (charge) induced by electrochemical reductive desorption, this method removes all DNA probes on the sensor surface, meaning that the sensor cannot be used for further DNA sensing. In contrast, we can evaluate the DNA probe density more quantitatively by SPR measurement after obtaining the relationship between the charge induced by electrochemical desorption and the SPR angle shift by EC-SPR measurement. Both the amount of charge induced by reductive desorption and the SPR angle shift increased with increasing immobilization time from 0 to 24 h, and a strong relationship between the amount of charge and the SPR angle shift was observed. Therefore, the density of immobilized DNA probes can be evaluated without destroying the surface. We applied EC-SPR results to evaluate the hybridization efficiency of target DNA by comparing the angle shifts observed by probe immobilization and target hybridization. 

Corresponding author: Osamu Niwa

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