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Advisor(s)
Abstract(s)
This study on anthocyanin colour variation (intensity, lambda max, absorptivity) 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 lambda max 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.
Description
Keywords
Anthocyanins Colour stability
Citation
Fossen, Torgils; Cabrita, Luis; Andersen, Øyvind M. (1998). Colour and stability of pure anthocyanins influenced by pH including the alkaline region. Food Chemistry. ISSN 0308-8146. 63: 4, p. 435-440
Publisher
Elsevier