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| 低场核磁共振法测定热烫面团水分迁移特性及超微结构分析 | |
| 引用本文： | 薛雅萌,赵龙,李保国. 低场核磁共振法测定热烫面团水分迁移特性及超微结构分析[J]. 食品科学, 2014, 35(19): 96-100. DOI: 10.7506/spkx1002-6630-201419020 |
| 作者姓名： | 薛雅萌 赵龙 李保国 |
| 作者单位： | 上海理工大学食品科学与工程研究所，上海 200093 |
| 基金项目： | 上海市教委科研创新项目，上海市联盟计划项目 |
| 摘 要： | 本实验采用低场核磁共振技术，研究水温和加水量对热烫面团中的水分分布和水分迁移特性的影响，并对其微观结构进行扫描电镜分析。结果表明：随着加水量的增加，热烫面团结合水和表面自由水的含量下降，吸附水含量增加；随着水温的升高，热烫面团结合水含量先升高后降低，吸附水和表面自由水的含量先降低后升高；超微结构图显示水温对面团微观结构影响较大，淀粉出现糊化现象，使得面团更加均匀细腻；水量的增加使得淀粉颗粒与面筋结构更多地黏连在一起，空隙也随之变小。 |
| 关 键 词： | 热烫面团 低场核磁共振 扫描电镜 水分迁移 超微结构 |
Moisture Migration and Ultrastructure of Hot-Water Dough as Studied with LF-NMR and SEM |
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| XUE Ya-meng,ZHAO Long,LI Bao-guo. Moisture Migration and Ultrastructure of Hot-Water Dough as Studied with LF-NMR and SEM[J]. Food Science, 2014, 35(19): 96-100. DOI: 10.7506/spkx1002-6630-201419020 | |
| Authors: | XUE Ya-meng ZHAO Long LI Bao-guo |
| Affiliation: | Institute of Food Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China |
| Abstract: | The effects of water temperature and water to flour ratio on moisture distribution and transfer characteristics in hot-water dough were studied using low-field nuclear magnetic resonance (LF-NMR), and the ultrastructure of the dough was observed under scanning electron microscope (SEM). The results showed that the bound and free water contents in hotwater dough decreased and the adsorbed water content increased with an increase in water to flour ratio. Increasing water temperature resulted in an initial increase followed by a decrease in the bound water content but the opposite changes in the adsorbed and free water contents in hot-water dough. The ultrastructure was affected greatly by water temperature, and the surface of the dough became more uniform and smooth as a result of starch gelatinization. The starch particles were tightly stuck with gluten structure and their voids consequently became smaller with an increase in water to flour ratio. |
| Keywords: | hot-water dough low-field nuclear magnetic resonance scanning electron microscopy moisture migration ultrastructure |
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