Author： Ali Tahira Mohsin Hasnain Abid
Publisher： Taylor & Francis Ltd
ISSN： 1023-666X
Source： International Journal of Polymer Analysis and Characterization, Vol.16, Iss.3, 2011-04, pp. : 187-198
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Abstract
Starch isolated from white sorghum (Sorghum bicolor) was acetylated by addition of acetic anhydride at concentrations of 3%, 6%, and 9% w/w of starch under alkaline conditions to produce starch acetates of three different degrees of substitutions. Morphological characterization through scanning electron microscopy revealed roughness on the surface of acetylated starch granules. The modified biopolymer exhibited improved swelling power, solubility, water binding capacity, and paste clarity compared to its native counterparts. Decrease in percent syneresis and gel hardness and extent of reduction in percent transmittance indicate reduced retrogradation tendency of white sorghum starch acetates.
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