3.5. Ethanol Analysis in Fermented Beverage Samples
The performance of the biosensor for practical applications in the analysis of fermented beverage samples was demonstrated by performing the determination of the alcohol content in beer, legen (a Javanese traditional fermented drink) and tapai (a solution obtained from fermented glutinous rice), estimated in terms of ethanol concentration. The samples just required a simple dilution step, in order to fit the linear range of the calibration curve. The alcohol content of the three types of fermented beverage samples was measured and summarized results are given in Table 5. The biosensor accuracy was assessed by comparison with the results given by the beer producers and others with the gas chromatography method.