【摘要】 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)。更多还原

【Abstract】 The aim of the study was to determine the meaning of different inversion peak of by analyzing the data of japonica,brown rice,brown rice without embryo and polished rice,based on low field nuclear magnetic resonance( LF-NMR). It also studied the regular pattern of moisture migration in the process of absorption and desorption of japonica,and analyzes the inverse peaks of different combination degree of moisture to ascertain the regular pattern of moisture migration in the process of absorption and desorption of japonica. Experimental investigation showed that the peak area of T21 and T22in rice,rice,brown rice without embryo and polished rice had 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 had a high fitting with the change of desorption quality of rice. The area of T22 had a positive correlation with the change of quality in rice; There were no distinct changes of the area of T23. However,during the adsorption,a good fitting appears in the T21 peak and the adsorption quality changes in rice. But T22 peak had no obvious regularity and the area of T23 changes a little. The equation in the desorption process is y = e-0. 161 1x0. 601 0( r2= 0. 993 5).更多还原