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Colour and stability of pure anthocyanins in aqueous solutions at high pH values
Orientador(es)
Resumo(s)
This study on anthocyanin colour variation (intensity, lambda max, molar absorbptivity) over the pH range
1-9 during 60 days of storage, was conducted on petunidin 3-[6-O-(4-O-E-p-coumaroyl-O-alfa-L-rhamnopyranosyl)-beta-D-glucopyranoside]-5-O-beta-D-glucopyranoside (petanin) and cyanidin 3-O-beta-D-glucopyranoside (cy3glc) at 10 and 23ºC.
Compared to cy3glc, petanin afforded higher colour intensity and higher or
similar stability throughout the whole pH range. At pH 4.0, 84% of petanin was
intact after 60 days storage at 10ºC, while the corresponding solution of cy3glc
was totally degraded. At pH 8.1 the colour intensity of petanin was even higher
than at the lowest pH values. The visible lmax absorption of petanin after 5 days
at pH 8.1 at 10ºC was similar or higher than the corresponding absorptions of
the fresh solutions of cy3glc at any pH. The use of anthocyanins like petanin as
food colorants in slightly alkaline products (bakery, milk, egg, etc.) should
therefore be considered at least in products with limited storage time kept in a
refrigerator.
Descrição
Palavras-chave
Anthocyanins Stability Colour Alkaline pH
Contexto Educativo
Citação
Andersen, Øyvind M.; Fossen, Torgils; Cabrita, Luis (1998). Colour and stability of pure anthocyanins in aqueous solutions at high pH values. In 19th International Conference on Polyphenols. Lille