Figure 1

Red adzuki beans and their chromatographic and spectral profiles. (a) Photos of red adzuki beans (scale bar: 10 mm) and (b) the purple an-paste. (c) HPLC chromatogram of the red adzuki bean seed-coat extract. (d) UV-Vis spectra of 2 and 3 obtained by 3D-detection. (e) The structure of cyanin.