| 摘要: |
| 本文利用低场核磁共振技术，分析蚕豆种子内部的水分含量及各相态下形变的规律，研究不同低温环境及不同真空度条件下种子脱水和变形特性。结果表明：z（厚度）方向收缩变化最大，易受到脱水环境影响。结合水含量在真空脱水过程中变化较小；半结合水含量呈增加-减少趋势；自由水含量不断减少至零。自由水在细胞间自由流动会增加呼吸代谢和营养消耗，应尽快排出；半结合水的转化与逸出对维持蚕豆种子组织形态有一定作用，结合水的逸出与细胞破裂有直接关系，对种子存活至关重要。蚕豆种子内部细胞膜破裂有3个阶段，水分运输行为与其相互影响，为维持种子活性，脱水应在第3阶段以前结束。 |
| 关键词: 水分相态 核磁共振 真空脱水 收缩变形 |
| DOI： |
| 投稿时间：2019-09-20 修订日期：2019-12-30
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| 基金项目:国家自然科学基金（51676139）资助项目 |
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| Water Flow and Deformation Characteristics of Cell Phases in Dehydration of Broad Bean Seeds |
| Zhu Kai,Li Yanjie,Wang Yabo,Wang Jinshan |
| (Key Laboratory of Refrigeration Technology of Tianjin, Tianjin University of Commerce) |
| Abstract: |
| The low-field nuclear magnetic resonance technique was used to analyze the moisture content inside broad bean seeds and the deformation mechanism in each phase. The characteristics of seed dehydration and deformation under different low temperature environments and different vacuum conditions were studied. The results show that the z (thickness) direction shrinkage varies the most and is susceptible to the dehydration environment. The combined water content does not change significantly during the vacuum dehydration process. The semi-bound water content shows an increase-decrease trend and the free water content continues to decrease to zero. The free flow of free water between cells can enhance respiratory metabolism and nutrient consumption, and hence should be discharged as soon as possible. The transformation and escape of semi-bound water plays a key role in maintaining the morphology of broad bean seeds. The escape of combined water is directly related to cell rupture that is vital to the survival of the seed. The cell membrane rupture in the broad bean seed has three stages, and the water transport interacts with it. To maintain seed activity, the dehydration should be completed before the third stage. |
| Key words: moisture phase nuclear magnetic resonance vacuum dehydration shrinkage deformation |
