Copper and Zinc Binding to Dietary Fiber Sources: An Ion Exchange Column Method

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Abstract
The ion exchange capacities of dietary fiber sources for copper and zinc were studied via a factorial design: 4 fiber sources X 2 treatments X 3 solutions. The treatments were: (1) neutral detergent and (2) enzymatic. The treated fiber residues were used as the stable matrix in columns and mineral‐containing solutions were pumped through the columns. The amount of minerals bound varied with fiber type and treatment type. All fiber residues bound more copper than zinc. Binding of both minerals was reduced when they were applied in combination. The treatment of the fibers produced residues with dissimilar physical properties. These results indicate the variability introduced by methodology.