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Advisor(s)
Abstract(s)
The performance of sequential injection (SI) systems has often been criticized for its low sampling frequency. The present
work describes a SI system where an injection valve and an additional pump were incorporated to enhance sample throughput
rate. The proposed systemwas applied to the enzymatic determination of glycerol and ethanol in wines, using spectrophotometric
detection and immobilized glycerol and alcohol dehydrogenases. The method proposed was applied to the determination
of ethanol between 0.10 and 0.50% (v/v) and glycerol between 0.03 and 0.30 g l−1. These ranges were appropriate for determination
in table and port wines, since samples were diluted 50 times before introduction into the system. The results obtained
from 15 wine samples were statistically comparable to those obtained by the reference methods, with good repeatability
(R.S.D. < 3.4%, n = 10). The sampling rate was 22.5 h−1, corresponding to 45 determinations per hour. This way, the time
required for each determination was decreased by 30% when compared to a conventional SI system.
Description
Keywords
Glycerol Ethanol Wine Sequential injection Glycerol dehydrogenase Alcohol dehydrogenase Port wine
Citation
SEGUNDO, Marcela A.; RANGEL, António O.S.S. - Sequential injection flow system with improved sample throughput: determination of glycerol and ethanol in wines. Analytica Chimica Acta. ISSN 0003-2670. Vol. 458 (2002), p. 131–138
