2 documents found, page 1 of 1
Elucidation of the multiple equilibria of malvin in aqueous solution by One- an...
Santos, Helena; Turner, David L.; Lima, João C.; Figueiredo, Paulo; Pina, Fernando S.; Maçanita, António L.One- and two-dimensional NMR were used to characterize the several forms of malvin present in aqueous solution in the pH range 0.3–4.5 and to determine their molar fractions as a function of pH. In addition to the flavylium cation, two hemiacetal forms and both the cis and trans forms of chalcone were firmly identified. The pathways for the interconversion of the different forms were derived and the molar absor...
EXCITED STATES OF ANTHOCYANINS: THE CHALCONE ISOMERS OF MALVIDIN 3,5‐DIGLUCOSIDE
Lima, J. C.; Danesh, Parvin; Figueiredo, Paulo; Pina, Fernando S.; Maçanita, AntónioThe 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...