Development and Biosensor Applications of Novel Functional Electrodes.

Area of Science:

• Electrochemistry
• Biosensors
• Materials Science

Background:

• Phenylboronic acid (PBA) derivatives offer enzyme-free sugar sensing by modulating optical/electrochemical properties upon binding.
• This review focuses on voltammetric properties of sugar sensors utilizing PBA derivatives.

Purpose of the Study:

• To review the voltammetric properties of sugar sensors based on dithiobis (4-butyrylamino-m-phenylboronic acid) (DTBA-PBA) modified electrodes.
• To discuss PBA-appended layer-by-layer film-modified electrodes for sugar sensing.
• To evaluate the redox properties of reduced graphene oxide (rGO)-modified glassy carbon electrodes (GCEs).

Main Methods:

• Modification of gold electrodes with a DTBA-PBA monolayer for sugar-sensitive electrodes.
• Fabrication of multilayer films with PBA-modified poly(allylamine hydrochloride) and carboxymethylcellulose on gold electrodes.
• Modification of GCEs with rGO for electrochemical detection of hydrogen peroxide (H2O2).

Main Results:

• DTBA-PBA modified electrodes showed attenuated cyclic voltammograms for Fe(CN)6(3-/4-) in the presence of sugars, enabling detection of D-glucose (3-300 mM) and D-fructose (0.3-30 mM).
• Layer-by-layer modified electrodes exhibited sugar-dependent responses with a dynamic range of 0.1-300 mM for D-glucose and D-fructose.
• rGO-modified GCEs demonstrated significantly enhanced electrochemical responses for H2O2 redox reactions.

Conclusions:

• PBA-based electrodes are effective for sensitive and selective sugar detection.
• The reviewed sensor platforms offer promising alternatives to enzyme-based sugar detection systems.
• rGO modification enhances the electrochemical sensing capabilities for analytes like H2O2.