Figure 4 | Scientific Reports

Figure 4

From: Structure of two purple pigments, catechinopyranocyanidins A and B from the seed-coat of the small red bean, Vigna angularis

Figure 4

Spectroscopic characterization of catechinopyranocyanidins A (2) and B (3). (a) UV-Vis and ECD spectra of 2 and 3. (b) UV and ECD spectra of 4 and 5. (c) Computed ECD curves for 13 conformers of 2 (Δε, (i)), the corresponding model (Δεmodel, (ii)), and their differences (Δε–εmodel, (iii)). (d) Vis spectra of 2 at various pH buffer solutions. (e) Stability of 2 and 3 at pH 5.

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