Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 62, Issue 29, Pages 6995-7001Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf404640m
Keywords
oaklins; copigments; deoxyanthocyanidins; anthocyanins; aldehydes; flavylium network; food colorants; wine aging; molecular dynamics
Funding
- Fundacao para a Ciencia e Tecnologia (FCT) [SFRH/BPD/72652/2010]
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The aim of this study was to investigate interactions possibly taking place in red wine between oaklins, which are deoxyanthocyanidin derivatives (guaiacylcatechin-pyrylium and syringylcatechin-pyrylium), and several copigments: catechin (CP1), epicatechin (CP2), chlorogenic acid (CP3), epigallocatechin (CP4), and procyanidin B3 (CP5). The results show that oaklins, like common anthocyanins, also present copigmentation interactions that further stabilize the flavylium cation in hydroalcoholic solutions. Molecular dynamics simulations were also performed to interpret the binding data, to specify the relative arrangement of the pigment and copigment molecules within the complexes, and to interpret their absorption properties in the visible range.
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