基于低场核磁研究稻谷吸附/解吸过程水分分布变化

The Change of Water Distribution in the Process of Adsorption/Desorption in Japonica by LF-NMR

基于低场核磁技术,对粳稻谷、糙米、去胚糙米、精米进行数据采集,确定了低场核磁不同反演峰的真实含义,并且研究了粳稻谷的吸附和解吸过程中水分迁移变化规律,对吸附解吸过程不同结合程度水分的低场核磁反演峰进行了分析,得到了粳稻谷在吸附和解吸过程水分迁移变化规律。研究表明,稻谷、糙米、去胚糙米和精米的T21、T22峰峰面积差距不大,精米的T23峰峰面积几乎可以忽略。在解吸过程中,粳稻谷T21峰的峰面积和峰顶点时间与稻谷解吸质量变化有很高的拟合度,T22峰的面积与稻谷质量变化成正相关,T23峰面积变化微弱;在吸附过程中,T21峰与稻谷吸附质量变化有较高的拟合度,T22峰没有明显的时间规律性,T23峰峰面积变化不大;解吸过程中Page方程为y=e-0.1611x0.601 0(r^2=0.993 5)。

The aim of the study was to determineSthe meaning ofSdifferent inversionSpeak by analyzing the data of japonica, brown rice, brown rice without embryo, based on low field nuclear magnetic resonance （LF-NMR）. It also study the regular pattern of moisture migration in the process of absorption and desorption of japonica. Analyzing the inverse peaks of different combination degree of moisture to ascertain the meanings of peaks. Experimental investigation shows that the peak area of T21 and T22 in rice, rice, brown rice without embryo and polished rice has no significant difference. And the peak area of T23 in polished rice almost can be ignored. During desorption, the peak area of T21 in round-grained rice and the summit time have a closely relevant to the change of weight of rice. The area of T22 has a positive correlation with the change of weight in rice; There is no distinct changes of the area of T23.However, during the absorption, a good regularity appears in the T21 peak and the weight changes in rice. But T22 peak has no obvious regularity and the area of T23 changed a little.