Anthocyanin-derived pigments in Port

N. Mateus, S.de Pascual-Teresa, J.C. Rivas-Gonzalo, C.Santos-Buelga and V. de Freitas, Structural diversity of anthocyanin-derived pigments in port wines. Food Chem. 76 (2002) 335-342. 

Mateus, N. De Freitas, V. A. P. Evolution and stability of anthocyanin-derived pigments in Port wine during ageing. J. Agric. Food Chem. 2001, 49, 5217-5222. 

Mateus, N., De Pascual-Teresa, S., Rivas-Gonzalo, J.C., Santos-Buelga, C. De Freitas, V (2002a). Strucmral diversity of anthocyanin-derived pigments in Port wines. Food Chemistry, 76, 335-342. 

Table 1. Anthocyanin-derived pigments detected in Port wine fractions eluted from Toyopeari gel column with 20% aqueous ethanol (Fraction A). 

In order to provide an unambiguous chemical identification of these structures, the anthocyanin-derived pigments detected in Port wines were named according to the chemical nomenclature rules recently proposed in literature... 

The structural diversity of anthocyanin-derived pigments found in two year-old Port wine suggests different reactions whereby original grape anthocyanins may associate to other colourless compounds. The detection and structural characterization of these pigments provides important information regarding the... 

Oliveira, J., Santos-Buelga, C., Silva, A.M.S., De Freitas, V Mateus, N. (2006). Chromatic and structural features of blue anthocyanin-derived pigments present in Port wine. Analytica Chimica Acta, 563, 2-9. 

More recently, a new family of anthocyanin-derived compounds (named portisins) has been detected in Port wine and found to display unusual spectroscopic features, presenting a bluish color at acidic conditions [290] (Fig. 57.18). Studies performed in wine model solution revealed that these pigments are formed from the reaction of carboxypyranoanthocyanins with flavanols mediated by acetaldehyde [290, 291]. 

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