Anthocyanins - Open Access .click

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1996
Anthocyanins occur widely in plants, being responsible for their blue, purple, violet, magenta, red and orange coloration; while betalains, consisting of red-violet betacyanins and yellow-orange betaxanthins, occur exclusively in families of the order Caryophyllales. The occurrence of these two classes of pigments is mutually exclusive. Their stability
J. L. Smith, R. L. Jackman
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Anthocyanins of Azolla

American Fern Journal, 1977
The red-orange coloration of the aquatic fern, Azolla, growing in the sun is well documented (Benedict, 1923; Moore, 1969; Olsen, 1970). However, the pigments that contribute to this coloration are not known to have been identified. Harborne (1965) has identified a number of anthocyanins (3-deoxyanthocyanidins) found in the ferns Adiantum, Dryopteris ...
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Characterization and Measurement of Anthocyanins by UV‐Visible Spectroscopy

, 2001
M. Giusti, R. Wrolstad
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Anthocyanins in Food [PDF]