Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/6548
Título: Sequential injection system for the spectrophotometric determination of reducing sugars in wines
Autor: Araújo, Alberto N.
Lima, José L. F. C.
Rangel, António O. S. S.
Palavras-chave: Sequential injection
Reducing sugars
Wine
Dialysis unit
Spectrophotometry
Data: 2000
Editora: Elsevier
Citação: ARAÚJO, Alberto N.; LIMA, José L. F. C.; RANGEL, António O. S. S. - Sequential injection system for the spectrophotometric determination of reducing sugars in wines. Talanta. ISSN 0039-9140. Vol. 52 (2000), p. 59–66
Resumo: A sequential injection system for the spectrophotometric determination of reducing sugars in wines is described. The methodology is based on the formation of a coloured complex produced by the reaction of copper (I) with 2,9-dimethyl-1,10-phenanthroline (neocuproine), after reduction of copper (II) to copper (I) by reducing sugars. In the present SI system, a dialysis unit was incorporated not only to allow the sample dilution, but also to minimise the interference of some coloured compounds. In this way, direct sample introduction into the system was possible, without any previous treatment of the wine samples. The proposed method can be applied to the determination of reducing sugars in two concentration ranges: from 2 to 25 g l 1 (table wines) and from 20 to 140 g l 1 (Port wines). To perform determinations in these two ranges, the manifold configuration remained the same; just a few operational parameters were changed in the controlling software. A sampling-rate of 14–18 samples per hour was obtained with good repeatability for ten consecutive injections of wine samples (relative standard deviations (RSD) B2.1%). The results obtained from 19 wine samples were comparable to those obtained by the reference method.
Peer review: yes
URI: http://hdl.handle.net/10400.14/6548
Versão do Editor: doi:10.1016/S0039-9140(99)00338-0
Aparece nas colecções:ESB - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review

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