基于低场核磁成像技术研究稻谷缓苏的机理  

Researching on The Mechanism of Rice Tempering Using The Low Field Magnetic Resonance Imaging Technique

作　　者：夏宝林 丁超[2] 章志华 严秋钫 杨娜 Xia Baolin;Ding Chao;Zhang Zhihua;Yan Qiufang;Yang Na(Jiangyin Detection Center for Food Safety,Wuxi 214434;college of food science and engineer,Nanjing University of Finance and Economics,Nanjing 210046;Faculty of Science,Jiangsu University,Zhenjiang 212013)

机构地区：[1]江阴市食品安全检测中心,无锡214434 [2]南京财经大学食品科学与工程学院,南京210046 [3]江苏大学理学院,镇江212013

出　　处：《中国粮油学报》2019年第11期100-105,共6页Journal of the Chinese Cereals and Oils Association

基　　金：江阴市社会发展科技示范项目(JY0603A0202011800 13PB);国家重点研发计划(2018YFD030 0806);江苏省农业科技自主创新资金(CX(17)1002-05);江苏省青年基金(BK20160487)

摘　　要：低场核磁共振成像技术研究了缓苏过程中稻谷颗粒内部水分分布情况,缓苏前1~2 h颗粒内部水分趋于平衡。对6种常见的干燥模型的颗粒内部水分扩散过程进行了拟合,得出双指数模型拟合效果最好,说明稻谷的缓苏过程存在2种水分传递过程,颗粒内部的水分扩散及颗粒表面的对流共同作用于颗粒内部水分梯度的消退。The low-field MRI technology was used to research the moisture distribution and migration within a single rice kernel during tempering process.During the tempering process,the distribution of moisture tended to be uniform,and the change mainly took place in the first 1 to 2 hours.The change in signal ratios in the center of rice kernels during tempering was fitted with six semi-theoretical thin-layer models to explain the rice kernel tempering process.The signal changes in the center region was best fitted by the two-term exponent model.The results revealed that moisture migration during tempering consists of two processes:convection outside the kernel at a high constant rate and diffusion inside the kernel at a low constant rate,and the two processes work together to reduce the MC gradient.

关 键 词：低场核磁共振成像 稻谷颗粒 干燥 缓苏 水分分布 水分迁移 

分 类 号：TQ646[化学工程—精细化工]