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Betalains are water-soluble nitrogen-containing pigments present in flowers and fruits of plants of the order Caryophyllales, where they replace anthocyanins. This article describes how flowers containing yellow betaxanthins are fluorescent. Betaxanthins exhibit spectra with excitation maxima between 463 nm and 474 nm and emission maxima between 509 nm and 512 nm. Thus, betaxanthins are able to absorb...
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