Photophysics and hydrolytic stability of betalains in aqueous trifluoroethanol
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- Bartoloni, F.H., Gonçalves, L.C.P., Rodrigues, A.C.B. et al. Monatsh Chem (2013) 144: 567. doi:10.1007/s00706-012-0883-5
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Betalains are natural antioxidant pigments responsible for the visible fluorescence of flowers. Although these compounds are almost exclusively soluble in water, they are very sensitive to both hydrolysis and water-catalyzed isomerization. We show that three representative betalains are soluble in 2,2,2-trifluoroethanol (TFE) and that the hydrolytic stability of these model compounds in hydroalcoholic solutions increases with increasing amount of TFE. Furthermore, TFE increases the fluorescence quantum yields of betaxanthins.