According to Fig. 2 all the substrates bound more than 80% of metal ion in the medium except the MR which absorbed comparatively lower percentage of Zn (II). The affinity of Zn (II) to CCWP(1), CCWP(2), CCWP(3) and VOR was not significantly different while the binding affinity to MR was significantly lower (p < 0.05). Binding affinity shown by Cu (II) towards all the substrates was not significantly different except for VOR which was significantly lower (P < 0.05). All the substrates bound more than 85% of Cu (II) added. Results indicate binding of comparatively lesser amount of Fe (II) to CCWPs and VOR and MR than Cu (II) and Zn (II). The substrates bound 80–88% Fe (II) added. However, CCWP(1) bound the highest amount (88.8%) of Fe (II) present in the medium. Maha Lakhsmi and Sumathi (1997) showed that Ragi NDF bound 59.6% Fe (II) and 65.6% Zn (II) while sorghum NDF bound 54% Fe (II) and 67.5% Zn (II). The ragi and sorghum flour and bran showed lower values of binding capacities than the corresponding NDF. CCWPs show much higher binding capacities to Fe (II) and Zn (II) than NDF of ragi and sorghum.