Utilize este identificador para referenciar este registo: http://hdl.handle.net/10884/1333
Título: EXCITED STATES OF ANTHOCYANINS: THE CHALCONE ISOMERS OF MALVIDIN 3,5‐DIGLUCOSIDE
Autores: Lima, J. C.
Danesh, Parvin
Figueiredo, Paulo
Pina, Fernando S.
Maçanita, António
Data: Abr-1994
Citação: Photochemistry and Photobiology, Vol. 59, pages 412-418
Resumo: The excited state properties of the chalcone isomers of malvidin 3,5‐diglucoside (malvin) in acidic aqueous solution (0 < pH < 4) were investigated using steady‐state and time‐resolved fluorescence spectroscopy. The two chalcone isomers of malvin were first isolated by high‐performance liquid chromatography and then characterized by UV/visible absorption and fluorescence spectroscopy. The results were supported by molecular orbital calculations. The rate constants for photodeprotonation (k1= 1 × 109 s−l) and protonation (k−1= 1.3 × 1010 L mol−1 s−l) were determined, both from the multiexponential fluorescence decays and the fluorescence intensities measured at the emission wavelengths of the neutral and ionized chalcone forms. The results here obtained are relevant for the understanding of the photoreactivity of anthocyanins in acidic medium.
URI: http://hdl.handle.net/10884/1333
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