Iron(II) chelation activity
By forming a stable iron(II) chelate, an extract with high chelating
power reduces the free ferrous ion concentration and thus
decreases the extent of the Fenton reaction which is implicated
in many diseases (Halliwell & Gutteridge, 1984). All the extracts
demonstrated an ability to chelate iron(II)ions in a dose-dependent
manner (Fig. 6). Three samples G1, G2 and G3 chelated ferrous
ions by 35.4 ± 0.56%, 56.8 ± 0.12% and 57.1 ± 1.83% at 1.14 g/mL,
respectively. From the figure, it can be seen that the most effective
iron(II) chelating extract was acid extract (96.3%), followed
by water extract (82.4%) and sodium hydroxide extract (62.5%), in
decreasing order.