459410.fig.003a
(a)
459410.fig.003b
(b)
459410.fig.003c
(c)
Figure 3: Absorption spectra of a mixture of aqueous solutions of pectin (0.5%) and silver nitrate (0.1%) in a ratio of 1 : 1 depending on (a) reaction duration: 1 min (1), 24 h (2), 48 h (3), 72 h (4), 96 h (5); (b) pH value: 3.5 (1), 7 (2), 9.7 (3), 11.5 (4); (c) reaction duration at pH 11.5: 1 min (1), 30 min (2), 60 min (3), 180 min (4), 24 h (5).