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Direct dissolution and regeneration of starch in NaOH/urea aqueous solution

By Sze Yin Kueh

Abstract

Dissolution of starch occurs immediately upon the addition of sodium hydroxide and a clear solution was obtained at sodium hydroxide of 1.4% or more. FTIR spectra of starches before and after alkali treatment revealed that treatment of starch with sodium hydroxide resulted in some physicochemical changes in the structure of starch. Addition of urea to starch solution helped in the swelling of starch granules and resulted in signif1cant increase in granule size. In this study, native sago and tapioca starches were dissolved directly in the ;\laOHIthionrea/nrea aqueous solution. The dissolution conditions were optimized such that these starches were dissolved with minimum degradation and good solubility. The starch solutions were treated with 95% ethanol to regenerate starch by precipitation. Regenerated starch samples were further modified with POCI, which serves as a cross-linking agent for preparing cross-linked starch nanoparticles. In this study, the regeneration of the crosslinked starch and its morphology, physicochemical and functional characteristics were evaluated. The morphology of the regenerated starches was investigated by scanning electron microscope (SEM), and the chemical structure of regenerated starches was determined by using Fourier transfonned infrared spectrometer (FTlR)

Topics: Q Science (General), QD Chemistry
Publisher: Universiti Malaysia Sarawak (UNIMAS)
Year: 2010
OAI identifier: oai:ir.unimas.my:25552
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