Biosensor based on an enzyme modified electrode for highly-sensitive measurement of polyphenols

Area of Science:

• Analytical Chemistry
• Biochemistry
• Electrochemistry

Background:

• Polyphenols are crucial compounds with diverse biological activities.
• Sensitive detection of polyphenols is essential for various applications, including environmental monitoring and diagnostics.
• Existing methods for polyphenol detection often lack sensitivity or require complex procedures.

Purpose of the Study:

• To develop a highly sensitive bioelectrocatalytic method for polyphenol detection.
• To utilize glucose dehydrogenase (GDH) from Acinetobacter calcoaceticus for amplified polyphenol measurement.
• To demonstrate the capability of monitoring subnanomolar polyphenol concentrations.

Main Methods:

• Immobilization of glucose dehydrogenase (GDH) on a glassy carbon electrode.
• Electrochemical oxidation of polyphenols at an anodic potential.
• Regeneration of polyphenols via enzyme-catalyzed reaction with glucose, creating an analyte recycling system.
• Monitoring amplified electrochemical signals for sensitive detection.

Main Results:

• Demonstrated successful application of GDH for polyphenol detection using bioelectrocatalytic analyte recycling.
• Achieved highly sensitive detection of polyphenols, with detection limits in the subnanomolar range.
• Established detection limits of 0.2 nM for p-aminophenol and 0.5 nM for norepinephrine.
• Showcased the dynamic properties of the enzyme-modified electrode for convenient monitoring.

Conclusions:

• The developed bioelectrocatalytic method offers a highly sensitive and efficient approach for polyphenol quantification.
• The use of GDH and analyte recycling significantly amplifies the electrochemical response, enabling subnanomolar detection.
• This method holds promise for various applications requiring sensitive polyphenol analysis.