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本文研究了不同花期金银花(三青期、大白期和全花期)红外干燥过程中的水分分布及状态变化。不同花期金银花在45℃条件下进行远红外干燥,应用低场核磁共振技术(LF-NMR)分析金银花中水分随时间的迁移变化情况。结果表明,不同花期的金银花中均含有三种状态的水:结合水、半结合水和自由水,其含量为:半结合水>结合水>自由水;三青期金银花的结合水和自由水含量高于大白期和开花期,半结合水含量相对低于大白期和开花期;金银花干燥过程中,不同状态的水也呈现出不同的变化规律,半结合水含量逐渐减小,结合水含量先减少后增加,干燥过程改变了金银花内部水分分布状态和水分含量,不同状态的水分之间会发生一定的相互转化,三青期金银花中部分结合水在干燥初期流动性变大,后期流动性变小,大白期金银花结合水流动性持续变小。干燥过程中金银花水分含量与半结合水的峰面积、总峰面积均有较高的相关性(R2>0.9),LF-NMR技术为金银花中水分分布及变化规律提供了直观的参考依据。
In this paper, the changes of water distribution and the state of inflorescence in different flowering stages of honeysuckle (three green, white and full flowering) were studied. Flos lonicerae at different flowering stages were far-infrared dried at 45 ℃, and the change of water migration with time was analyzed by low-field nuclear magnetic resonance (LF-NMR). The results showed that the honeysuckle at different flowering stages contained three states of water: bound water, semi-bound water and free water, and the content was: semi-binding water> water of binding> free water; combined water of three-age honeysuckle and free water The content of semi-bound water was lower than that of white-white and flowering at the stage of white-fronting and flowering; the water of different states also showed different changes during the drying process of honeysuckle, the semi-combined water content decreased gradually, and the combined water content The first decrease and then increase, the drying process changes the internal water distribution of honeysuckle and moisture content, water between different states will some mutual transformation, some of the three blue honeysuckle in the dry early part of the fluidity becomes larger, the latter part of the liquidity Smaller, white-white honeysuckle combined with water mobility continued to become smaller. In the process of drying, the water content of Honeysuckle had a higher correlation with the peak area and the total peak area of semi-binding water (R2> 0.9). LF-NMR technology provided an intuitive reference for the distribution and variation of water content in honeysuckle.