Development of a Glucose Sensor Based on Glucose Dehydrogenase Using Polydopamine-Functionalized Nanotubes

Overview

Journal Membranes (Basel)

Date 2021 Jun 2

PMID 34073998

Citations 7

Authors

Won-Yong Jeon

Hyug-Han Kim

Young-Bong Choi

Affiliations

Soon will be listed here.

Abstract

The electrochemical-based detection of glucose is widely used for diagnostic purposes and is mediated by enzyme-mediated signal transduction mechanisms. For such applications, recent attention has focused on utilizing the oxygen-insensitive glucose dehydrogenase (GDH) enzyme in place of the glucose oxidase (GOx) enzyme, which is sensitive to oxygen levels. Currently used Ru-based redox mediators mainly work with GOx, while Ru(dmo-bpy)Cl has been proposed as a promising mediator that works with GDH. However, there remains an outstanding need to improve Ru(dmo-bpy)Cl attachment to electrode surfaces. Herein, we report the use of polydopamine-functionalized multi-walled carbon nanotubes (PDA-MWCNTs) to effectively attach Ru(dmo-bpy)Cl and GDH onto screen-printed carbon electrodes (SPCEs) without requiring a cross-linker. PDA-MWCNTs were characterized by Fourier transform infrared (FT-IR) spectroscopy, Raman spectroscopy, and thermal gravimetric analysis (TGA), while the fabrication and optimization of Ru(dmo-bpy)Cl/PDA-MWCNT/SPCEs were characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements. The experimental results demonstrate a wide linear range of glucose-concentration-dependent responses and the multi-potential step (MPS) technique facilitated the selective detection of glucose in the presence of physiologically relevant interfering species, as well as in biological fluids (e.g., serum). The ease of device fabrication and high detection performance demonstrate a viable pathway to develop glucose sensors based on the GDH enzyme and Ru(dmo-bpy)Cl redox mediator and the sensing strategy is potentially extendable to other bioanalytes as well.

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