Analysis of Internal Moisture Change of Camphor Seeds during Drying by Low-Field NMR

• 作者: Buhong GAO Feng LIN Jing YANG Yan XUAN Yilong XIANG Ying TANG
• 来源期刊: 农业生物技术:英文版
• 学科: 物理学
• 关键词: Nuclear Magnetic Resonance(NMR) CAMPHOR SEED Water distribution RELAXATION time spectrum Correlation
• 年，卷（期）: 2019,（4）
• 页码范围: 119-122
• 页数: 4页
• 分类号: O57

摘要

In this study,low-field nuclear magnetic resonance(LF-NMR)was used to collect the transverse relaxation signals of camphor seeds that had been dried at different temperatures and for different durations.The transverse relaxation time of the hydrogen nucleus was obtained by SIRT(Simultaneous Iterative Reconstruction Technique)inversion,and the correlation between the moisture content on dry basis and the amplitude of NMR signal of camphor seeds sampled at different drying stages was analyzed.The results showed that water existed in three main forms strongly bound water,weakly bound water and free water in camphor seeds.During the drying process,the peak position of strongly bound water remained unchanged,but the peak positions of weakly bound water and free water fluctuated.Drying rate increased with drying temperature increasing.In addition,there was a very significant linear relationship between the total NMR signal amplitude and moisture content on dry basis,and the correlation coefficient reached 0.984 4.