Please use this identifier to cite or link to this item: https://hdl.handle.net/10216/95047
Author(s): Paulo J Magalhaes
Suzete M Almeida
Ana M Carvalho
Luis M Goncalves
Joao G Pacheco
Jose M Cruz
Luis F Guido
Aquiles A Barros
Title: Influence of malt on the xanthohumol and isoxanthohumol behavior in pale and dark beers: A micro-scale approach
Issue Date: 2011
Abstract: The main objective of this work was to understand which compounds are responsible for the partial inhibition of xanthohumol (XN) thermal isomerization during wort boiling of dark malts. With such purpose, worts from different kinds of malt (pale, caramel and roasted) were chemically characterized (e.g. antioxidant activity, polyphenols and melanoidins contents) and studied by several chromatographic techniques. Molecular exclusion chromatography experiments showed that adsorption of XN to polyvinylpolypyrrolidone is lower for the high molecular weight fractions. It seems likely that this is due to the reaction between XN and coloured substances that changes chemical properties of XN or, at least, results in the formation of complexes that have different chemical properties. This leads to an inhibition of XN isomerization observed in this work. It was also verified that the melanoidins content was significantly higher in the higher molecular weight fractions, suggesting that probably these compounds are the main responsible for the XN isomerization inhibiting effect.
Subject: Outras ciências agrárias
Other Agrarian Sciences
Scientific areas: Ciências agrárias::Outras ciências agrárias
Agrarian Sciences::Other Agrarian Sciences
URI: https://repositorio-aberto.up.pt/handle/10216/95047
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FCUP - Artigo em Revista Científica Internacional

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