Integrated biosensor systems for ethanol analysis
Eliana M Alhadeff1, Andrea M Salgado, Oriol Cós
1Escola de Química, Centro de Tecnologia, Universidade Federal do Rio de Janeiro, Ilha do Fundão, Cidade Universitaria, Rio de Janeiro, Brazil. ema@eq.ufrj.br
Applied Biochemistry and Biotechnology
|April 19, 2008
Summary
This study developed integrated biosensor systems for accurate ethanol detection in various samples using flow injection analysis (FIA) and sequential injection analysis (SIA). The optimized systems demonstrated high precision for analyzing ethanol in fuels, beverages, and fermentation broths.
Area of Science:
- Analytical Chemistry
- Biotechnology
- Biosensor Technology
Background:
- Accurate ethanol quantification is crucial for quality control in alcoholic beverages, fermentation processes, and biofuel analysis.
- Existing methods for ethanol detection may lack the sensitivity, speed, or integration required for diverse sample matrices.
- Bi-enzymatic biosensors offer a promising platform for selective and sensitive analyte detection.
Purpose of the Study:
- To develop and evaluate integrated bi-enzymatic biosensor systems for ethanol detection.
- To compare the performance of flow injection analysis (FIA) and sequential injection analysis (SIA) methods for ethanol quantification.
- To assess the applicability of the developed biosensors for real-world samples, including gasohol, alcoholic beverages, and fermentation media.
Main Methods:
- Development of integrated bi-enzymatic biosensor systems utilizing immobilized alcohol oxidase and horseradish peroxidase.
- Application of two distinct analytical techniques: flow injection analysis (FIA) and sequential injection analysis (SIA) with stop-flow.
- Testing of biosensor performance with varying enzyme immobilization strategies and sample dilution ratios.
Main Results:
- The FIA system achieved a detection range of 0.05-1.5 g/l with a correlation coefficient of 0.9909.
- The SIA system with stop-flow demonstrated a linear range of 0.005-0.04 g/l (R²=0.9922).
- Bi-enzymatic systems with separate enzyme immobilization yielded detection ranges from 0.001-0.066 g/l (without dilution) and 0.010-0.047 g/l (with 1:7,000 dilution), achieving R² values of 0.9897 and 0.9992, respectively.
Conclusions:
- Integrated bi-enzymatic biosensors using FIA and SIA are effective for precise ethanol determination.
- The developed systems show high sensitivity and accuracy across a wide range of ethanol concentrations.
- These biosensors are suitable for the analysis of ethanol in complex matrices like gasohol, alcoholic beverages, and fermentation samples.
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