DEVELOPMENT OF AUTOMATIC LOW PRESSURE CHROMATOGRAPHIC FLOW SYSTEMS FOR WINE ANALYSIS, BASED ON MONOLITHIC COLUMNS AND MINIATURIZED DETECTORS

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Sequential injection system for the enzymatic determination of ethanol in alcoholic beverages with in-line dilution

Publication . Pais, Teresa F. M.; Vidigal, Susana S. M. P.; Tóth, Ildikó V.; Rangel, António O. S. S.

A sequential injection system for the enzymatic determination of ethanol in wines with spectrophotometric detection was developed. The determination was based on the enzymatic reaction involving ethanol and NAD(+) in the presence of alcohol dehydrogenase. A gas-diffusion unit was introduced in the system to perform an in-line dilution. It was possible to operate the system with a reagent consumption of 1.3 mg of NAD(+), 0.45 U of ADH, and 32 mu L of sample, per assay with a determination rate of 21 h(-1). The results obtained from the analysis of wine samples were statistically equivalent to those obtained by the reference method, with good repeatability; the relative standard deviation (n = 10) was <1% with a LOQ of 0.3% (v/v). (C) 2012 Elsevier Ltd. All rights reserved.

2013Journal article

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