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The equilibrium forms of three different families of dimethylamino-based pyranoanthocyanins (1, 2 and 3) were studied in aqueous solutions at different pH values from 1 to 12 using UV–Visible spectroscopy. The forms present under those conditions are strongly correlated to the pyranoanthocyanin structural features. The increase of the electronic delocalization helps the protonation at the amino group...
Pyranoanthocyanins are anthocyanin-derived compounds found in nature that present a vast palette of colours ranging from yellow to turquoise blue. Studies in aqueous solutions of these pigments by UV–Visible spectroscopy revealed their higher colour stability when compared to their anthocyanin precursors. Through Nuclear Magnetic Resonance (NMR) techniques it was possible to confirm the absence of...
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