| 摘要: |
| 本文研究了低温真空环境下蚕豆种子的脱水特性及脱水过程中微观结构的变化规律。将蚕豆种子样品置于真空度为97 kPa，温度分别为0、4、8 ℃的真空装置中脱水300 min，每隔30 min测定样品的水分比及收缩率，利用扫描电子显微镜与图像处理技术，获得不同水分比下蚕豆种子细胞图像和各细胞结构参数的分布曲线，分析真空环境对蚕豆种子脱水特性及细胞结构参数的影响。结果表明：在低温真空脱水过程中，水分比呈指数递减，Page模型拟合效果最好；收缩率逐渐增加，后趋于平缓；细胞面积、周长、直径等尺寸参数主要分布区间虽在小范围内有所波动，但整体呈减小趋势，数据分布逐渐集中；细胞形状参数的变化较小，圆度与伸长率变化范围均在10%以内，而紧密度几乎保持恒定 |
| 关键词: 细胞变形 脱水特性 微观结构 生命材料 |
| DOI： |
| 投稿时间：2020-02-24 修订日期：2020-05-18
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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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| Study on Dehydration Characteristics and Microstructure Variation of Broad Bean Seeds under Low Temperature Vacuum Environment |
| Zhang Xilong,Zhu Kai,Wang Yabo,Wang Jinshan,Li Yanjie |
| (Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce) |
| Abstract: |
| In this paper, dehydration characteristics and microstructure variation of broad bean seeds under low temperature vacuum environment were examined. The dehydration experiments were performed at 0, 4, and 8 ℃under a vacuum of 97 kPa. The moisture ratio and shrinkage of the samples were determined every 30 min. Scanning electron microscopy (SEM) was used to obtain the images of broad bean seed cells. The structural parameter distribution curves of broad bean cells at different moisture ratios were obtained by using the image processing technique. The effects of the vacuum environment on the dehydration characteristics and cell structural parameters of broad bean seeds were analyzed. The results showed that during dehydration, the moisture ratio exponentially decreased, and the Page model exhibited the best fitting effect. Thus, the shrinkage gradually increased first. Subsequently, the variation tended to be gentle. Although the main distribution intervals of size parameters, such as cell area, perimeter, and diameter fluctuated within a small range, the overall trend was decreased. Thus, the data distribution was gradually concentrated. Furthermore, the change in cell shape parameters was low, the roundness and elongation ranged within 10%, and the compactness was almost constant. |
| Key words: cell deformation dehydration characteristics microstructure seed materials |
