An oxygen-rich fill-and-flow channel biosensor

Area of Science:

• Electrochemistry
• Biosensors
• Enzyme Technology

Background:

• Accurate glucose measurement is vital for wine quality control.
• Existing methods may lack efficiency or require complex sample preparation.
• Development of rapid and reliable biosensors is an ongoing area of research.

Purpose of the Study:

• To develop and evaluate an oxygen-rich fill-and-flow channel biosensor for wine glucose determination.
• To investigate the performance of immobilized glucose oxidase (GOD) in carbon paste (CP) for hydrogen peroxide detection.
• To assess the impact of different hydrophobic matrices (mineral oil, Kel-F oil) on biosensor performance.

Main Methods:

• Immobilization of glucose oxidase (GOD) within carbon paste (CP) using mineral oil or Kel-F oil.
• Design of a fill-and-flow channel biosensor with a downstream detector electrode.
• Electrochemical detection of hydrogen peroxide produced by the enzymatic reaction.
• Analysis of wine samples and comparison with spectrophotometric methods.

Main Results:

• The biosensor demonstrated a response limited by enzyme-substrate reaction kinetics, not mass transport.
• Kel-F oil matrix provided superior reproducibility and a wider dynamic range compared to mineral oil.
• The biosensor maintained performance after degassing, indicating robustness.
• Wine sample analysis showed good agreement with established spectrophotometric assays.

Conclusions:

• The developed fill-and-flow channel biosensor is a viable tool for accurate glucose measurement in wine.
• The use of Kel-F oil in the carbon paste matrix enhances biosensor performance and stability.
• This biosensor offers a promising alternative for routine wine analysis.