Abstract
Two different enzyme electrodes for the determination of ethanol in alcoholic beverages were developed by immobilizing alcohol oxidase or catalase in a k-Carrageenan gel layer overlapping an amperometric gaseous diffusion Clark type oxygen electrode. The response of biosensors toward standard solutions of ethanol,methanol, n-propanol, n-butanol, ethylenglycol and glycerol was recorded, compared and discussed. In the characterization studies of the biosensors several parameters such as pH, operational stability, response time, analysis time and calibration repeatability, between-days and between-electrodes, calibration reproducibility, linearity, and sensitivity, were studied. Finally by using the developed biosensors, the ethanol concentration of several commercial wine and beer samples was determined. The results, obtained with the two enzyme electrodes, were compared and the correlation evaluated by statistic tests. The biosensor method using catalase enzyme seemed to be the most suitable of the two enzyme devices for a selective and less expensive determination of ethanol in alcoholic beverages. The catalase enzyme electrode actually showed the greatest selectivity to ethanol, of all the alcohols tested. The response of the catalase biosensor was not influenced by the presence of the methanol in particular and its operational stability was found to be significantly higher than that of the alcohol oxidase sensor. The only drawback associated with the use of the catalase biosensor, compared to the method based on alcohol oxidase, is the slightly increased time required to perform the ethanol analysis in each sample of alcoholic beverage.
Keywords: Analysis, alcoholic beverages, ethanol, enzyme sensors.
Current Analytical Chemistry
Title:Ethanol Determination in Alcoholic Beverages Using Two Different Amperometric Enzyme Sensors
Volume: 11 Issue: 1
Author(s): Riccardo Angeloni, Mauro Tomassetti, Mauro Castrucci and Luigi Campanella
Affiliation:
Keywords: Analysis, alcoholic beverages, ethanol, enzyme sensors.
Abstract: Two different enzyme electrodes for the determination of ethanol in alcoholic beverages were developed by immobilizing alcohol oxidase or catalase in a k-Carrageenan gel layer overlapping an amperometric gaseous diffusion Clark type oxygen electrode. The response of biosensors toward standard solutions of ethanol,methanol, n-propanol, n-butanol, ethylenglycol and glycerol was recorded, compared and discussed. In the characterization studies of the biosensors several parameters such as pH, operational stability, response time, analysis time and calibration repeatability, between-days and between-electrodes, calibration reproducibility, linearity, and sensitivity, were studied. Finally by using the developed biosensors, the ethanol concentration of several commercial wine and beer samples was determined. The results, obtained with the two enzyme electrodes, were compared and the correlation evaluated by statistic tests. The biosensor method using catalase enzyme seemed to be the most suitable of the two enzyme devices for a selective and less expensive determination of ethanol in alcoholic beverages. The catalase enzyme electrode actually showed the greatest selectivity to ethanol, of all the alcohols tested. The response of the catalase biosensor was not influenced by the presence of the methanol in particular and its operational stability was found to be significantly higher than that of the alcohol oxidase sensor. The only drawback associated with the use of the catalase biosensor, compared to the method based on alcohol oxidase, is the slightly increased time required to perform the ethanol analysis in each sample of alcoholic beverage.
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Cite this article as:
Angeloni Riccardo, Tomassetti Mauro, Castrucci Mauro and Campanella Luigi, Ethanol Determination in Alcoholic Beverages Using Two Different Amperometric Enzyme Sensors, Current Analytical Chemistry 2015; 11 (1) . https://dx.doi.org/10.2174/1573411010666140612004417
DOI https://dx.doi.org/10.2174/1573411010666140612004417 |
Print ISSN 1573-4110 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-6727 |
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