Analysis of Safe Storage Moisture Content of Mume Flos Decoction Pieces Based on Theory of Water Activity and Water Molecular Mobility

HAN Tongtong; RAO Xiaoyong; QI Fengmei; HE Yan; ZHAN Guoping; LUO Xiaojian; CHEN Ruilin

doi:10.13422/j.cnki.syfjx.20222446

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Analysis of Safe Storage Moisture Content of Mume Flos Decoction Pieces Based on Theory of Water Activity and Water Molecular Mobility

更新时间：2023-06-02

- Analysis of Safe Storage Moisture Content of Mume Flos Decoction Pieces Based on Theory of Water Activity and Water Molecular Mobility
  增强出版
- Chinese Journal of Experimental Traditional Medical Formulae Vol. 29, Issue 13, Pages: 151-156(2023)
- 作者机构：
  
  1.江西中医药大学，南昌 330004
  2.江西本草天工科技有限责任公司，南昌 330004
  3.江西江中中药饮片有限公司，江西九江 332300
  4.深圳市前海蛇口自贸区医院，广东深圳 518067
- 作者简介：
- 基金信息：
- DOI：10.13422/j.cnki.syfjx.20222446
  CLC： R22;R28;R943.1;O657
- Published：05 July 2023，
  
  Published Online：08 November 2022，
  
  Received：07 September 2022，
- 稿件说明：
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韩童童,饶小勇,漆凤梅等.基于水分活度和水分子流动性理论的梅花饮片安全储藏含水量分析[J].中国实验方剂学杂志,2023,29(13):151-156.

HAN Tongtong,RAO Xiaoyong,QI Fengmei,et al.Analysis of Safe Storage Moisture Content of Mume Flos Decoction Pieces Based on Theory of Water Activity and Water Molecular Mobility[J].Chinese Journal of Experimental Traditional Medical Formulae,2023,29(13):151-156.
韩童童,饶小勇,漆凤梅等.基于水分活度和水分子流动性理论的梅花饮片安全储藏含水量分析[J].中国实验方剂学杂志,2023,29(13):151-156. DOI： 10.13422/j.cnki.syfjx.20222446.

HAN Tongtong,RAO Xiaoyong,QI Fengmei,et al.Analysis of Safe Storage Moisture Content of Mume Flos Decoction Pieces Based on Theory of Water Activity and Water Molecular Mobility[J].Chinese Journal of Experimental Traditional Medical Formulae,2023,29(13):151-156. DOI： 10.13422/j.cnki.syfjx.20222446.

摘要

目的

从宏观［水分活度（

）］和微观（水分子流动性）角度研究梅花饮片吸湿特性，为其安全储藏含水量的确定提供理论依据。

方法

通过静态称重法获得梅花饮片吸附等温线，对常见的7种吸湿模型进行拟合及评价，根据决定系数（

）越接近1、残差平方和（RSS）越接近0和Akaike信息量准则（AIC）越小的原则筛选出最优模型，依据最优模型计算梅花饮片在25、35、45 ℃温度下的绝对、相对安全含水量；利用低场核磁共振（LF-NMR）对梅花饮片吸湿过程中水分子流动性进行测定。

结果

描述梅花饮片吸附等温线的最佳模型为Peleg模型。由模型表达式计算得到25、35、45 ℃温度下梅花饮片的绝对安全含水量分别为9.59%、7.96%、7.68%；相对安全含水量分别为13.05%、11.99%、11.77%。不同温度吸湿时，梅花饮片中均存在2种状态的水，即结合水

、自由水

。在吸湿过程中，结合水峰面积增加幅度最大。结合水、自由水峰面积之和与含水量之间有较好的线性关系，25、35、45 ℃温度下

分别为0.959 9、0.911 8、0.974 7。

0.57时，

未发生改变，水分子流动性不变；

0.57时，

呈现增加趋势，水分子流动性增加。25、35、45 ℃温度下水分子流动性增加时饮片含水量分别为8.44%、6.81%、6.25%。

结论

结合

、水分子流动性理论，建议以6.25%作为梅花饮片的安全储藏含水量，该研究结果可为其他中药饮片安全储藏含水量的确定提供参考。

Abstract

Objective

The hygroscopic properties of Mume Flos decoction pieces were studied from the perspectives of macroscopic［water activity（

）］ and microscopic（water molecular mobility）， which provided a theoretical basis for the determination of the safe storage moisture content.

Method

Adsorption isotherm of Mume Flos decoction pieces was obtained by static weighing method， and seven common hygroscopic models were fitted and estimated. The best model was selected according to the principle that determination coefficient（

） was closer to 1， residual sum of squares（RSS） was closer to 0 and Akaike information criterion（AIC） was smaller. According to the optimal model， the absolute and relative safe moisture contents of Mume Flos decoction pieces at 25， 35， 45 ℃ was calculated. Low-field nuclear magnetic resonance（LF-NMR） was used to measure the water molecular mobility in the hygroscopic process of Mume Flos decoction pieces.

Result

The best model to describe the adsorption isotherm of Mume Flos decoction pieces was the Peleg model. According to the model expression， the absolute safe moisture contents of Mume Flos decoction pieces at 25， 35， 45 ℃ were 9.59%， 7.96% and 7.68%， and the relative safe moisture contents were 13.05%， 11.99%， 11.77%， respectively. Mume Flos decoction pieces all contained two water states during the process of hygroscopic absorption at different temperatures， namely bound water

and free water

. During the process of hygroscopic absorption， bound water had the largest increase in peak area. The sum of peak areas of the bound water and free water had a good linear relationship with the moisture contents， and the

were 0.959 9， 0.911 8 and 0.974 7 at 25， 35， 45 ℃， respectively. When

0.57，

did not change， and the water molecular mobility remained unchanged. When

0.57，

showed an increasing trend， and the water molecular mobility increased. The moisture contents of Mume Flos decoction pieces were 8.44%， 6.81% and 6.25% when the water molecular mobility increased at 25， 35， 45 ℃， respectively.

Conclusion

Combined with the theory of water activity and water molecular mobility， 6.25% is recommended as the safe storage moisture content of Mume Flos decoction pieces， this study can provide reference for determining the safe storage moisture content of other decoction pieces.

关键词

梅花饮片含水量水分活度（Aw）水分子流动性低场核磁共振（LF-NMR）吸附等温线

Keywords

Mume Flosdecoction piecesmoisture contentwater activity（Aw）water molecular mobilitylow-field nuclear magnetic resonance（LF-NMR）adsorption isotherm

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