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Notice of retraction
Vol. 34, No. 8(3), S&M3042

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.
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Sensors and Materials, Volume 30, Number 10(2) (2018)
Copyright(C) MYU K.K.
pp. 2359-2367
S&M1681 Research Paper of Special Issue
https://doi.org/10.18494/SAM.2018.1947
Published: October 25, 2018

H2O2 Detection by Redox-based Potentiometric Sensors under Biological Environments [PDF]

Tatsuya Iwata, Sinya Mizutani, Koichi Okumura, Yuki Okumura, Kazuhiro Takahashi, and Kazuaki Sawada

(Received April 2, 2018; Accepted September 7, 2018)

Keywords: potentiometry, redox sensors, neurotransmitters, H2O2

Hydrogen peroxide (H2O2) is an important target material to detect biomolecules including acetylcholine, glutamate, and glucose. In this study, we report on H2O2 detection under biological environments based on the redox reaction. The redox potential change caused by the reaction between the electron mediators of ferrocenes and H2O2 catalyzed by horseradish peroxidase was measured with a gold electrode connected to a source follower circuit. The mediators were either dissolved in sample solutions using ferrocenyl methanol (FcMeOH) or immobilized on the sensor surface in the form of 11-ferrocenyl-1-undecanethiol (11-FUT). H2O2 detection under biological environments was demonstrated in both samples. The overall outputs in the 11-FUT-immmobilzed electrodes were lower than in the samples with dissolved FcMeOH. The detection range of H2O2 was from 10−5 to 10−3 M for the samples with dissolved FcMeOH, while it was from 10−4 to 10−2 M for the 11-FUT-immobilized electrodes. It was suggested that the oxidation of the mediators by H2O2 insufficiently took place in the 11-FUT-immobilized electrodes, leading to the lower outputs.

Corresponding author: Tatsuya Iwata


Cite this article
Tatsuya Iwata, Sinya Mizutani, Koichi Okumura, Yuki Okumura, Kazuhiro Takahashi, and Kazuaki Sawada, H2O2 Detection by Redox-based Potentiometric Sensors under Biological Environments , Sens. Mater., Vol. 30, No. 10, 2018, p. 2359-2367.



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