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Comparison of Gelatinization and Retrogradation Characteristics among Endosperm Mutant Rices Derived from Ilpumbyeo  

Kang, Hee-Jin (Department of Food and Nutrition, Research Institute of Human Ecology, Seoul National University)
Seo, Han-Seok (Department of Food and Nutrition, Research Institute of Human Ecology, Seoul National University)
Hwang, In-Kyeong (Department of Food and Nutrition, Research Institute of Human Ecology, Seoul National University)
Publication Information
Korean Journal of Food Science and Technology / v.36, no.6, 2004 , pp. 879-884 More about this Journal
Abstract
Effects of soaking time and particle size on physicochemical properties of nonwaxy rice flour were investigated. Nonwaxy rice grains were soaked at $4^{\circ}C$ for 0, 1, 12, and 24 hr, dried at room temperature, and milled. Resulting flours were passed through 45-mesh ($<355\;{\mu}m$, IL45) and 100-mesh ($<150\;{\mu}m$, IL100) sieves and separated into $<40\;{\mu}m\;and\;40-100\;{\mu}m$ series. IL45 series showed higher amount of large particles ($40-100\;{\mu}m$) than IL100 series. As the soaking time increased, protein and ash contents decreased, and amylose content, water-binding capacity, swelling power, and solubity of nonwaxy rice flours increased. Swelling power and solubility of nonwaxy rice flours also increased between $65-85^{\circ}C$. Water-binding capacity, swelling power, and solubility of IL100 series were higher than those of IL45 series. 12 hr-soaked nonwaxy rice flour pastes showed higher peak viscosity and breakdown but lower setback and viscosity at 95 and $50^{\circ}C$ than 1 hr-soaked ones. X-Ray diffractograms of nonwaxy rice flours were not affected, whereas surface appearance was affected, by soaking time and particle size.
Keywords
endosperm mutant rice; gelatinization; retrogradation; cooked rice;
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