Kinetics on the turbidity change of wheat starch during its retrogradation
Kinetics on the turbidity change of wheat starch during its retrogradation
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DOI：
10.1080/09168451.2016.1171698
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发表时间：
2016-04
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影响因子：
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通讯作者：
Soma Fukuzawa;Takenobu Ogawa;K. Nakagawa;S. Adachi
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文献类型：
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作者：
Soma Fukuzawa;Takenobu Ogawa;K. Nakagawa;S. Adachi
将10-40%（w/w）的小麦淀粉分散体糊化，并在400-1100 nm波长范围内测量储存期间每种溶液的浊度变化。当溶液在5 ° C和30 °C下储存时，相对透射率（定义为任何储存时间的透射率与初始时间的透射率之比）降低;反映老化进展的降低在5 °C下大于在30 °C下。发生在14天内的相对透射率的变化大部分是在第一个90分钟内实现的。相对透射率的变化与变形所需的能量成反比。相对透过率变化的动力学可用威布尔方程表示。在较高的淀粉浓度下，较大的速率常数可以归因于淀粉颗粒的状态，这取决于淀粉浓度。图形摘要Et/E0和It/I 0在5 °C下储存60 min期间的瞬时变化Et和E0以及It和I 0分别是淀粉溶液在任何时间t和储存前在785 nm处进行5 mm压缩和透射所需的能量。
Wheat starch dispersions of 10–40% (w/w) were gelatinized and the change in turbidity of each solution during storage was measured in the 400–1100 nm wavelength range. The relative transmittance, defined as the ratio of transmittance at any storage time to that at the initial time, decreased when the solutions were stored at 5 and 30 °C; the decrease, reflecting the progress of retrogradation, was larger at 5 °C than at 30 °C. Most of the changes in relative transmission taking place over 14 days were achieved during the first 90 min. The change in the relative transmittance is inversely proportional to the energy required for deformation. The kinetics on change in relative transmittance can be expressed by Weibull equation. The larger rate constant at higher starch concentration could be ascribed to the state of the starch granules, which depended on starch concentration. Graphical abstract Transient changes in the Et/E0 and It/I0 during storage at 5 °C for 60 min. Et and E0, and It and I0 are energies necessary for 5 mm compression and transmittance at 785 nm of starch solutions at any time t and before storage, respectively.