• Title, Summary, Keyword: physically modified rice starch

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Comparative Growth Performance and Physiological Function of Physically Modified Rice Starch and Gelatinized Rice Starch in Growing Rats (물리적 변성 쌀전분과 호화 쌀전분의 생리적 효과 비교연구: 성장 능력과 장기의 생리적 기능)

  • Chang, Moon-Jeong;Kim, Myung-Hwan
    • Journal of the Korean Society of Food Culture
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    • v.18 no.6
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    • pp.592-600
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    • 2003
  • Male rats were fed a purified diet containing one of 3 experimental diets, gelatinized rice starch that was not modified physically (RC), gelatinized physically modified rice starch using ultrasonic homogenizer(RU), gelatinized physically modified rice starch using hydroshear homogenizer(RH) during 28 days. RC was used as the rice starch control. Feeding a physically modified rice starch (RU) caused an increase in liver weight and RH increased RNA and protein contents in kidney significantly although there were no differences in food intakes compared to feeding a RC diet. The wet weight of liver, kidney and heart were higher in RU. The wet weights of fecal output of the rats fed RH was greater than in rice control group. The gut transit time was longer in the rats fed RH than in the rice control group significantly. Serum GOT, GPT, total bilirubin concentration were tended to be lower and blood urea nitrogen was significantly lower in RH group. The maturation index of kidney was higher in RU than in RC. These results suggest that physically modified rice starch improved growth performance and physiological functions in organs of growing rats.

Physicochemical Properties of Physically Modified Rice Starch by Homogenizer (균질기를 이용한 물리적 변성 쌀 전분의 이화학적 특성)

  • Han, Myung-Ryun;Kim, Myung-Hwan
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.34 no.5
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    • pp.700-706
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    • 2005
  • The objectives of this research were to analyze physicochemical properties of physically modified rice starch which was prepared by hydro-shear homogenizer and ultrasonic homogenizer. The 5:1 of water to starch ratio, 20,500 rpm of hydro-shear homogenizer, and 5 sec of pulse and 40 kHz of frequency of ultrasonic homogenizer, which were operated for 10 min. The 1/3 of size reduction of raw rice starch and gelatinized rice starch, and reduced of particle size were achieved by above processing conditions. The homogenization of raw rice starch and gelatinized rice starch were higher values of specific area, transmittance, solubility and swelling power than control. While, these had lower value of apparent viscosity than control. In raw rice starch, the gelatinization characteristics of ultrasonic homogenizer treated rice starch had some higher values of gelatinization temperature, peak temperature and enthalpy than those of control. While, those of hydro-shear homogenizer treated rice starch had similar values to those of control.

Changes in Pasting and Fluid Properties of Corn and Rice Starches after Physical Modification by Planetary Mill

  • Kim, Bum-Keun;Lee, Jun-Soo;Cho, Yong-Jin;Park, Dong-June
    • Food Science and Biotechnology
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    • v.17 no.4
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    • pp.814-818
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    • 2008
  • Com and rice starches were physically modified by planetary mill. While native starches showed high peak viscosities (1,001 and 563 cp), it decreased largely (42 and 20 cp for rice and com starch, respectively) after 2 hr of physical modification. When two starches were co-ground, peak viscosities decreased more largely than single ground one only in 30 min, indicating the pasting properties could be easily changed by co-grinding. Especially, the higher the amount of com starch, the viscosity decreased more largely, which means that paste stability could be controlled also by changing the ratio of com and rice starch. Mean particle size increased with physical modification time since particles became spread because of shear force. There were also changes in surface morphology after physical modification. Fluid property, such as mean time to avalanche (MTA), was improved (from $6.16{\pm}0.47$ and $8.37{\pm}1.23\;sec$ to $5.47{\pm}0.78$ and $5.26{\pm}1.37\;sec$ for rice and com starch, respectively) by physical modification. Pasting property, such as swelling power, was also improved by physical modification. These mean that native starches can be applied to both conventional powder and new paste-food industry more efficiently by physical modification.

Application of Heat/Moisture-Treated Rices for Sikhe Preparation (습열처리 변성 쌀을 이용한 식혜제조)

  • Yook, Cheol;Cho, Seok-Cheol
    • Korean Journal of Food Science and Technology
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    • v.28 no.6
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    • pp.1119-1125
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    • 1996
  • Physically modified rices were prepared by heat/moisture-treatment and its application for sikhe preparation was examined. The modified rice starch showed decreases in swelling, viscosity and enthalpies of gelatinization. But gelatinization temperature was increased by the treatment. The rate of saccharification for sikhe with the heat/moisture-treated rice autoclaved at 15 psi, $121^{\circ}C$ for 1 hr was twice higher than the untreated rice. Brix in sikhe of the untreated rice saccharified for 2 hrs was 8.2, whereas sikhe made with rice autoclaved for 1 hr was 8.7 only after 1 hour of saccharification. However. there was no difference in sugar composition analyzed by HPLC between both of them.

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