Effect of Freezing on Electrical and Rheological Properties of Food Materials
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概要
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Changes in electrical and rheological properties in freezing-thawing were measured and compared for various food materials, which could be classified into three groups. In the first group, plant tissue (vegetables and fruits) showed large and frequency-dependent impedance and clear characteristic Cole-Cole arc in their fresh state. These electrical properties drastically changed after freezing-thawing: impedance greatly decreased and the Cole-Cole arc disappeared, suggesting the serious change in the cell structure. Correspondingly, the dynamic elasticity and viscosity substantially decreased. In the second group, animal and fish meats showed the lower impedance and unclear Cole-Cole arc as compared with plant tissue, but these properties scarcely changed after freezing-thawing. Rheological properties were also unchanged reflecting the large freezing-tolerance for food materials in this group. In the third group, konnyaku (alimentary yam paste) and tofu (soyprotein curd) showed increase both in impedance and viscoelasticity after freezing-thawing reflecting the freeze-denaturation of the major components.
- 社団法人 日本食品科学工学会の論文
- 2004-11-01
著者
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KUMAGAI Hitoshi
Department of Food Science and Nutrition, Kyoritsu Women’s University
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MIYAWAKI Osato
Department of Applied Biologicao Chemistry, The University of Tokyo
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SHIMIYA Yoko
Department of Food and Health Sciences, Jissen Women's University
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Shimiya Yoko
Department Of Food And Health Science Jissen Women's University
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Shimiya Yoko
Department Of Agricultural Chemistry The University Of Tokyo : (present Office)department Of Food An
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Miyawaki Osato
Department Of Agricultural Chemistry Faculty Of Agriculture The University Of Tokyo
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OHNISHI Shigehiko
Fermentation and Food Research Institute, Kagawa Prefectural Industrial Technology Center
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Kumagai Hitoshi
Department Of Domestic Science Kyoritsu Women's University
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Kumagai Hitoshi
Department Of Agricultural And Biological Chemistry Nihon University
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Ohnishi Shigehiko
Fermentation And Food Research Institute Kagawa Prefectural Industrial Technology Center
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