Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/6860
Título: Sequential injection flow system with improved sample throughput: determination of glycerol and ethanol in wines
Autor: Segundo, Marcela A.
Rangel, António O.S.S.
Palavras-chave: Glycerol
Ethanol
Wine
Sequential injection
Glycerol dehydrogenase
Alcohol dehydrogenase
Port wine
Data: 2002
Editora: Elsevier
Citação: 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
Resumo: 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.
Peer review: yes
URI: http://hdl.handle.net/10400.14/6860
Versão do Editor: http://www.sciencedirect.com/science/journal/00032670
Aparece nas colecções:ESB - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review

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