Dielectric relaxation measurement and analysis of restricted water structure in rice kernels
Dielectric relaxation measurement and analysis of restricted water structure in rice kernels
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DOI：
10.1088/0957-0233/18/4/004
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发表时间：
2007-04-01
影响因子：
2.4
通讯作者：
Shinyashiki, Naoki
中科院分区：
文献类型：
--
作者：
Yagihara, Shin;Oyama, Mikio;Shinyashiki, Naoki
采用同轴扁端电极时域反射法（TDR）测量了米粒的介电弛豫。电极表面与籽粒之间良好接触的困难通过设置用于籽粒的样品保持器的TDR来消除，并且可以从松弛曲线评估水含量。对不同含水量的米粒、米粉和米饭进行了介电测量，并从水分子的限制动力学和τ-β（科尔-科尔方程的弛豫时间与弛豫时间分布参数）图解释了水分子的含水量和动力学行为。与其它水相体系相比，湿稻米中水的动态结构更类似于水分散体系而不是水溶液。
Dielectric relaxation measurements were performed for rice kernels by time domain reflectometry (TDR) with flat-end coaxial electrodes. Difficulties in good contact between the surfaces of the electrodes and the kernels are eliminated by a TDR set-up with a sample holder for a kernel, and the water content could be evaluated from relaxation curves. Dielectric measurements were performed for rice kernels, rice flour and boiled rice with various water contents, and the water amount and dynamic behaviour of water molecules were explained from restricted dynamics of water molecules and also from the tau - beta (relaxation time versus the relaxation-time distribution parameter of the Cole - Cole equation) diagram. In comparison with other aqueous systems, the dynamic structure of water in moist rice is more similar to aqueous dispersion systems than to aqueous solutions.