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玉米籽粒的系统流变学研究

A Systematical Rheological Study of Maize Kernel.

作者信息

Sheng Shaoyang, Shi Aimin, Xing Junjie

机构信息

School of Public Health, Anhui Medical University, Hefei 230032, China.

Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Key Laboratory of Agro-Products Processing, Ministry of Agriculture and Rural Affairs, Beijing 100193, China.

出版信息

Foods. 2023 Feb 8;12(4):738. doi: 10.3390/foods12040738.

Abstract

In this study, the rheological behavior of maize kernel was systematically investigated using a dynamic mechanical analyzer. The loss in toughness caused by drying resulted in a downward shift in the relaxation curve and an upward shift in the creep curve. The long relaxation behavior became obvious when the temperature was above 45 °C, resulting from the weakening of hydrogen bonds with temperature. The maize kernel relaxed more rapidly at high temperatures, caused by a reduction in the cell wall viscosity and polysaccharide tangles. The Deborah numbers were all much smaller than one, suggesting that the Maxwell elements showed viscous behavior. Maize kernel, as a viscoelastic material, showed a dominant viscous property at high temperatures. The decline in with increasing drying temperature indicated an increase in the width of the relaxation spectrum. A Hookean spring elastic portion made up the majority of the maize kernel creep strain. The order-disorder transformation zone of maize kernel was about 50-60 °C. Due to the complexity of maize kernel, the William-Landel-Ferry constants differed from the universal values; these constants should be ascertained through experiments. Time-temperature superposition was successfully used to describe the rheological behavior. The results show that maize kernel is a thermorheologically simple material. The data acquired in this study can be used for maize processing and storage.

摘要

在本研究中,使用动态力学分析仪系统地研究了玉米粒的流变行为。干燥导致的韧性损失使松弛曲线向下移动,蠕变曲线向上移动。当温度高于45℃时,长松弛行为变得明显,这是由于氢键随温度减弱所致。由于细胞壁粘度和多糖缠结减少,玉米粒在高温下松弛得更快。德博拉数均远小于1,表明麦克斯韦元件表现出粘性行为。玉米粒作为一种粘弹性材料,在高温下表现出主要的粘性特性。随着干燥温度升高,松弛谱宽度增加。胡克弹性弹簧部分构成了玉米粒蠕变应变的大部分。玉米粒的有序-无序转变区约为50-60℃。由于玉米粒的复杂性,威廉-兰德尔-费里常数与通用值不同;这些常数应通过实验确定。时间-温度叠加成功地用于描述流变行为。结果表明,玉米粒是一种热流变学简单材料。本研究获得的数据可用于玉米加工和储存。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c512/9955850/8cd11c45304c/foods-12-00738-g001.jpg

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