Voltammetric assay for the aging of beer

• Tipo: Artigo em Revista Científica Internacional
• Data: 2003

Autores

Guido, LF (Autor) FCUP; Fortunato, NA (Autor) Outra; Rodrigues, JA (Autor) FCUP; Barros, AA (Autor) FCUP

Revista

Título: Journal of Agricultural and Food Chemistry

Vol. 51

Páginas: 3911-3915

ISSN: 0021-8561

Editora: American Chemical Society

Indexação

ISI Web of Knowledge - 25 Citações

Scopus - 24 Citações

Classificação Científica

FOS: Ciências agrárias > Outras ciências agrárias

Outras Informações

ID Authenticus: P-000-FXY

DOI: 10.1021/jf020895u

Abstract (EN): A new method for the evaluation of beer aging, based on a voltammetric analysis of beer distillates, is described. By measuring the current of both acetaldehyde and sulfite voltammetric peaks it is possible to distinguish between fresh, naturally aged, and artificially aged beers. The results obtained for the ratio of acetaldehyde and SO2 currents correlate well with those given by an expert sensory panel. The kinetics of the combining reaction of sulfite with acetaldehyde was followed for different acetaldehyde/SO2 molar ratios by using a programmed voltammetric procedure. The formation of an acetaldehyde-sulfite adduct is rapid, and the reaction equilibrium is reached after 30 min, which is in accordance with the results previously obtained by other methods. This voltammetric-based approach seems to be a new attractive tool for detecting chemical equilibria of the addition of sulfite to carbonyls in beer model systems.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 5