LF-NMR结合MRI分析热泵干燥过程中黑木耳水分迁移  

InvestigatingWater Migration in Auricularia auricula during Heat Pump Drying at Different Temperatures Using LF-NMR and MRI

作　　者：任爱清 蔡文[1,2] 韩春阳 唐小闲 段振华[1,2] REN Ai-qing;CAI Wen;HAN Chun-yang;TANG Xiao-xian;DUAN Zhen-hua(School of Food and Biological Engineering,Hezhou University,Hezhou 542899,Guangxi,China;Guangxi Key Laboratory of Health Care Food Science and Technology,Hezhou 542899,Guangxi,China)

机构地区：[1]贺州学院食品与生物工程学院,广西贺州542899 [2]广西康养食品科学与技术重点实验室,广西贺州542899

出　　处：《食品研究与开发》2023年第10期10-16,共7页Food Research and Development

基　　金：国家自然科学基金项目(32160573);广西自然科学基金项目(2020GXNSFAA259093);贺州学院博士科研启动基金项目(HZUBS202009)。

摘　　要：采用低场核磁共振(low-field nuclear magnetic resonance,LF-NMR)和核磁共振成像(magnetic resonance imaging,MRI)技术,探讨黑木耳在不同热泵干燥温度脱水过程中的水分状态和分布变化。结果表明:黑木耳的热泵干燥过程加速和恒速干燥阶段持续时间较短,降速干燥阶段较长;黑木耳中的自由水首先被脱除,然后是结合水,且有部分自由水向结合水转移;黑木耳含水率与总峰面积呈较强的线性相关性(R2=0.9847);黑木耳边缘和表面的水分首先被脱除,根部的水分逐渐向边缘和表面转移;低场核磁共振技术可以作为一种快速、无损监测黑木耳热泵干燥过程水分迁移的有效方法。The effects of drying temperature on water migration in Auricularia auricula during heat pump drying were investigated using low-field nuclearmagnetic resonance(LF-NMR)and magnetic resonance imaging(MRI)techniques.The results showed that the acceleration and constant drying stages were short while the deceleration stage was long.The free water in Auricularia auricula was first removed,followed by the bound water,and some of the free water was converted to bound water.The correlation coefficient between moisture content and total peak area of water was found to be 0.9847.Water first evaporated at the edge of Auricularia auricula and then at the roots.The results demonstrate the potential of LF-NMR as a rapid and nondestructive method for monitoring water migration in Auricularia auricula during heat pump drying.

关 键 词：黑木耳 低场核磁共振 核磁共振成像 热泵 干燥 

分 类 号：TS219[轻工技术与工程—粮食、油脂及植物蛋白工程]