Abstract
Microscopic examination showed a change on the surface structure of dietary fibers (DF) from rice straw (RS) and sugarcane bagasse (SB) by alkaline hydrogen peroxide (AHP) treatment. Effect of particle size on in-vitro binding of calcium (Ca) and magnesium (Mg) of AHP-RS, AHP-SB and Solka Floc® 900 (SF) were evaluated. Total bound Ca and Mg decreased with particle size reduction ( P<0.05) for all types of DF. Ca and Mg (82–95%) were released from AHP-RS and AHP-SB by acid washing but only 53–60% Mg was removed from SF. There were strong correlations between water holding capacity, oil binding capacity and particle density and total bound Ca and Mg for all DF samples.
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