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KMID : 1160619990040030175
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Preventive Nutrition and Food Science
1999 Volume.4 No. 3 p.175 ~ p.179
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Effects of pH and Gamma Irradiation on the Physicochemical Properties of Corn Starch
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Kang Il-Jun
Chung Cha-Kwon
Sohn Jeong-In
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Abstract
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To develop a production method for modified starches with less pollution, pH adjustment and gamma irradiation were applied to commerical corn starch. Blue values were significantly decreased , while alkali number, optical transmittance and solubility markedly increased when gamma irradiation was applied to pH 2 adjusted corn starch. Water binding capacity and swelling power at pH 5 were the highest among the samples. Gelatinization viscosity was considerably affected by gamma irradiation and pH of the starch. Gamma irradiation of pH 2 adjusted starch showed the lowest peak viscosity and the best cooling stability among the tested samples . Therefore, the production of modified starch with low viscosity as well as with sufficient viscosity stability seems feasible by controlling the pH of the starch and gamma irrdiation.
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KEYWORD
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gamma irradiation, pH, corn starch, physicochemical property
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