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Polyacylated anthocyanins from Hebe
Cabrita, Luís; Justesen, Ulla; Frøystein, Nils Åge; Andersen, Øyvind M.Four acylated anthocyanins were isolated from flowers of Hebe spp. On the basis of LC-MS (Liquid Chromatography - Mass Spectrometry) and NMR (Nuclear Magnetic Resonance) techniques, they were identified as (1) cyanidin 3-O-[2-O-(6-O-(E-caffeoyl)-beta-glucopyranosyl)-6-O-(E-p-coumaroyl)-beta-glucopyranoside]-5-O-beta-glucopyranoside, (2) cyanidin 3-O-[2-O-(6-O-(E-p-coumaroyl)-beta-glucopyranosyl)-6-O-(E-p-coumar...
Anthocyanin stability: a chemometrical approach
Cabrita, Luís; Fossen, Torgils; Flåten, Geir R.; Andersen, Øyvind M.The stability of cyanidin 3-glucoside towards five different factors (pH, anthocyanin concentration, sodium chloride concentration, ascorbic acid concentration, Oxygen) was studied during 60 days storage at room temperature using a 2^4-1 reduced factorial design. The influence of each individual parameter on anthocyanin stability was found to vary as a function of time. Sodium chloride and ascorbic acid were, r...
Anthocyanin-rich extract decreases indices of lipid peroxidation and DNA damage...
Ramirez-Tortosa, Carmen; Cabrita, Luís; Andersen, Øyvind M.; Gardner, P.T.; Morrice, P.C.; Wood, S.G.; Duthie, S.J.; Collins, A.R.; Garry, G.G.Anthocyanins are secondary plant metabolites responsible for the blue, purple, and red color of many plant tissues. The phenolic structure of anthocyanins conveys marked antioxidant activity in model systems via donation of electrons or hydrogen atoms from hydroxyl moieties to free radicals. Dietary intakes of anthocyanins may exceed 200 mg/day, however, little is known about their antioxidant potency in vivo. ...
Anthocyanin trisaccharides in blue berries of Vaccinium padifolium
Cabrita, Luís; Frøystein, Nils Åge; Andersen, Øyvind M.Delphinidin 3-O-alfa-rhamnoside, malvidin 3-O-(6''-O-alfa-rhamnopyranosyl-beta-glucopyranoside) and the 3-O-(6''-O-alfa-rhamnopyranosyl-2''-O-beta-xylopyranosyl-beta-glucopyranosides) of cyanidin, petunidin and peonidin were isolated by various chromatographic techniques from the edible berries of Vaccinium padifolium. Their complete structures were elucidated mainly by one- and two-dimensional nuclear magnetic...
Colour and stability of the six common anthocyanidin 3-glucosides
Cabrita, Luís; Fossen, Torgils; Andersen, Øyvind M.This study on anthocyanin stability and colour variation (lambda max, absorptivity) in the pH range 1-12 during a period of 60 days storage at 10 and 23ºC, was conducted on the 3-glucosides of the six common anthocyanidins. It was mostly in the alkaline region that differences in colour and stability became significant. Although it has been generally accepted that anthocyanins are stable only at low pH values, ...
Colours of pure anthocyanidin 3-glucosides in aqueous solutions during storage
Cabrita, Luís; Fossen, Torgils; Andersen, Øyvind M.A study on anthocyanin stability and colour variation (intensity, lambda max., molar absorptivity) during storage at 10º and 23ºC over the pH range 1-12 was conducted for the 3-glucosides of the six common anthocyanidins. These results show that some anthocyanins may provide stable and intense bluish colour for extended application in slightly alkaline food products. For instance, there are some Mexican food (v...
Anthocyanins in blue berries of Vaccinium padifolium
Cabrita, Luís; Andersen, Øyvind M.Twenty anthocyanins were isolated from the extract of the edible blue berries of Vaccinium padifolium (Uveira) by a combination of chromatographic techniques. Mainly on the basis of nuclear magnetic resonance techniques (1H, COSY, TOCSY, HSQC, HMBC, SEFT) they were identified as the 3-O-beta-glucopyranosides, 3-O-beta-galactopyranosides, 3-O-beta-arabinopyranosides and 3-O-sambubiosides (2'-O-beta-xylopyranosyl...
Colour and stability of pure anthocyanins in aqueous solutions at high pH values
Andersen, Øyvind M.; Fossen, Torgils; Cabrita, LuísThis 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 ...
Colour and stability of pure anthocyanins influenced by pH including the alkali...
Fossen, Torgils; Cabrita, Luís; Andersen, Øyvind M.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 sim...
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