After adding 1.0 mM of metal ion into cyanidin solution, the Cy-Cu(II) complex shows longer wavelength from 570 nm to 590 nm as the same result as complexation of Cy-Pb(II) shifting from 560 nm to 580 nm.
After adding 1.0 mM of metal ion into cyanidin solution, the Cy-Cu(II) complex shows longer wavelength from 570 nm to 590 nm as the same result as complexation of Cy-Pb(II) shifting from560 nm to 580 nm.