Abstract
Spectral data for both the common and rare naturally-occurring anthocyanidins are given. Spectral measurements were made of a large number of anthocyanins. It is shown that 3- and 3,5-glycosides have characteristically different absorption properties in the 400-450 m [mu] region. Measurements of the absorption spectra in the UV region of anthocyanins acylated with hydroxy aromatic acids can be used to determine the hydroxy aromatic acid; pigment ratio in these complex pigments. The value of these measurements for characterizing anthocyanins is discussed.
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