利用低场核磁分析玉米干燥过程中内部水分变化  

Analysis of Internal Moisture Changes in Corn Dry Process Investigated by Low Field-NMR

作　　者：任广跃[1] 曾凡莲[1] 段续[1] 刘威[1] 闫沙沙[1] 

机构地区：[1]河南科技大学食品与生物工程学院,洛阳471023

出　　处：《中国粮油学报》2016年第8期95-99,共5页Journal of the Chinese Cereals and Oils Association

基　　金：河南省重大科技专项(121199110110)

摘　　要：采用低场核磁共振的横向弛豫时间(T_2)反演谱技术,研究了玉米在不同热风干燥温度下(60、75、90、105、120、135℃)内部水分的变化。干燥处理改变了玉米内部水分的迁移特性,使得与玉米淀粉相结合的结合水和仅次于自由水的结合水的自由度增加,玉米内部水分逐渐向外迁移,干燥速率随着干燥温度升高而渐增,干基含水率与核磁共振信号幅值之间存在十分显著的线性关系。A transverse relaxation time （ T2 ） spectrum inversion technology of low field nuclear magnetic reso- nance （NMR）was used to explore the internal moisture migration mechanism in the corn drying process with different drying temperatures（60,75,90,105,120,135℃ ）. Experiment showed that the dry processing changed the internal moisture migration characteristics of corn, which increased freedom of bound water combined with corn starch and that next to free water, corn internal moisture moved outward gradually, the drying rate increased as the drying temperature rose, and it was concluded that there was a significant linear relationship between dry basis moisture content and the nuclear magnetic resonance（NMR） signal amplitude.

关 键 词：玉米 低场核磁共振 水分迁移 热风干燥 弛豫时间 

分 类 号：TS210.2[轻工技术与工程—粮食、油脂及植物蛋白工程]