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A new amperometric enzyme electrode for alcohol determination
1Department of Chemistry, Süleyman Demirel University, Isparta 32260, Turkey. handang@fef.sdu.edu.tr
Biosensors & Bioelectronics
|April 18, 2002
Summary
A novel enzyme electrode utilizing alcohol oxidase immobilized in a polyvinylferrocenium matrix was developed for alcohol determination. This biosensor offers reproducible and sensitive detection of various alcohols, with methanol being the most sensitive.
Area of Science:
- Electrochemistry
- Biotechnology
- Analytical Chemistry
Background:
- Enzyme electrodes are crucial for sensitive analyte detection.
- Alcohol oxidase is a key enzyme for alcohol metabolism and detection.
- Immobilization techniques enhance enzyme electrode stability and performance.
Purpose of the Study:
- To develop a novel enzyme electrode for alcohol determination.
- To immobilize alcohol oxidase within a polyvinylferrocenium matrix on a platinum electrode.
- To investigate the electrochemical properties and optimize the performance of the developed enzyme electrode.
Main Methods:
- Immobilization of alcohol oxidase in a polyvinylferrocenium matrix on a Pt electrode.
- Amperometric detection of enzymatically generated hydrogen peroxide at +0.70 V vs. SCE.
- Optimization of pH, temperature, substrate, buffer, and enzyme concentrations.
- Evaluation of electrode reproducibility, sensitivity, and linear response range for various alcohols.
Main Results:
- The enzyme electrode exhibited optimal performance at pH 8.0 and 30°C.
- Steady-state current showed reproducibility within +/-5.0% relative error.
- Sensitivity order was methanol > ethanol > n-butanol > benzyl alcohol.
- Linear detection ranges were established for methanol (3.7 mM), ethanol (3.0 mM), n-butanol (6.2 mM), and benzyl alcohol (5.2 mM).
- Apparent Michaelis-Menten constant (K(Mapp)) and activation energy (Ea) for methanol were 5.78 mM and 38.07 kJ/mol, respectively.
Conclusions:
- A robust and reproducible enzyme electrode for alcohol determination was successfully developed.
- The polyvinylferrocenium matrix provides a suitable environment for alcohol oxidase immobilization.
- The developed biosensor demonstrates good sensitivity and linear response for various alcohols, highlighting its potential in analytical applications.