Influence of Heat-Moisture Treatment and Acid Modifications on Physicochemical, Rheological, Thermal and Morphological Characteristics of Indian Water Chestnut (Trapa natans) Starch and its Application in Biodegradable Films (original) (raw)

Starch-starke, 2009

Abstract

Water chestnut starch was subjected to acid modification and heat-moisture treatment. Hydrochloric acid was used for acid modification at three different concentrations (0.25 M, 0.5 M and 1 M) for 2 h. Modifications did not alter the granule morphology. Heat-moisture treatment (HMT) resulted in slight reduction in the granular size of the starch granules. Acid modification lowered the amylose content, swelling power, water- and oil-binding capacity but improved the solubility of starch to a considerable level. Light transmittance of acid-modified (AM) starches improved significantly. A significant reduction in peak, trough, final and setback viscosity was observed by acid-thinning. In case of heat-moisture treated starch the final viscosity (Fv) was found to be even higher than the peak viscosity (Pv). Native water chestnut starch exhibited a lower onset temperature (To) and peak temperature (Tp) of gelatinization than the corresponding acid-treated starches. Starch films prepared from native starch exhibited excellent pliability, whereas those prepared from AM and HMT starches showed good tensile strength. Starch films prepared from acid-treated starches provided better puncture and tensile strength.

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