Voltage-controlled enzyme-catalyzed glucose-gluconolactone conversion using a field-effect enzymatic detector.

Area of Science:

• Biotechnology
• Electrochemistry
• Enzyme Kinetics

Background:

• Enzyme-immobilized electrodes are crucial for biosensing.
• Understanding enzymatic conversion kinetics is key for optimizing detection methods.
• Field-effect principles offer novel control mechanisms in biochemical processes.

Purpose of the Study:

• To investigate the control of enzymatic conversion kinetics using field-effect enzymatic detection (FEED).
• To demonstrate the influence of gating voltage (VG) on glucose-gluconolactone conversion.
• To showcase the ultrasensitive detection capabilities of FEED for hydrogen peroxide (H2O2).

Main Methods:

• Utilized the field-effect enzymatic detection (FEED) technique.
• Employed mass spectrometry to confirm glucose-gluconolactone conversion.
• Conducted electrochemical studies to analyze current dependence on gating voltage and ion concentration.

Main Results:

• Confirmed glucose-gluconolactone conversion kinetics using mass spectrometry.
• Demonstrated that glucose oxidation current and depletion are dependent on gating voltage (VG).
• Achieved ultrasensitive detection of H2O2 at the zepto-molar level using FEED.

Conclusions:

• The gating voltage (VG) effectively controls the kinetics of enzymatic conversion processes.
• FEED provides a mechanism for precise control over enzymatic reactions.
• FEED exhibits significant potential for ultrasensitive analyte detection.