银杏白果干燥过程中水分分布及迁移的变化

doi:10.3969/j.issn.1000-2006.201808008

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南京林业大学学报（自然科学版） ›› 2019, Vol. 43 ›› Issue (6): 188-192.doi: 10.3969/j.issn.1000-2006.201808008

银杏白果干燥过程中水分分布及迁移的变化

孙旭¹(), 姜东², 徐莉², 花彤彤³, 宣艳⁴^,^*(), 曹福亮³

1.南京林业大学信息科学技术学院,江苏南京 210037
2.南京林业大学理学院,江苏南京 210037
3.南京林业大学林学院,江苏南京 210037
4.南京林业大学现代分析测试中心,江苏南京 210037

收稿日期:2018-08-03 修回日期:2018-10-19 出版日期:2019-11-30 发布日期:2019-11-30
通讯作者: 宣艳
基金资助:
国家重点研发计划(2017YFD0600706)

Moisture distribution and migration of Ginkgo biloba seeds during air drying process

SUN Xu¹(), JIANG Dong², XU Li², HUA Tongtong³, XUAN Yan⁴^,^*(), CAO Fuliang³

1. College of Information Science and Technology, Nanjing Forestry University, Nanjing 210037, China
2. College of Science, Nanjing Forestry University, Nanjing 210037, China
3. College of Forestry, Nanjing Forestry University, Nanjing 210037, China
4. Advanced Analysis and Testing Center, Nanjing Forestry University, Nanjing 210037, China

Received:2018-08-03 Revised:2018-10-19 Online:2019-11-30 Published:2019-11-30
Contact: XUAN Yan

摘要/Abstract

摘要：

【目的】探讨银杏白果在干燥过程中水分分布、迁移规律及低场核磁共振信号量与含水量之间的关系,为银杏白果水分传递模型的建立以及储存过程中含水量的快速测定提供依据。【方法】利用低场核磁共振技术,对不同热风干燥温度(50、60、70、80、90 ℃)处理的银杏白果中氢核的横向弛豫衰减信号进行测试,并利用SIRT模型对数据进行反演,得出横向弛豫时间T₂的反演数据。利用自旋回波脉冲序列对银杏白果的质子密度加权成像。【结果】银杏白果中的水分主要有3种存在状态,分别为结合水(0.79~7.32 ms)、束缚水(13.67~89.07 ms)和自由水(109.70~1 072.27 ms)。经过热风干燥处理改变了银杏白果中水分的结合状态,水分发生明显迁移,自由水和束缚水的信号幅值随干燥温度的升高而逐渐减弱。不同含水率银杏白果的反演峰总面积不同,随着干基含水率的增加,核磁共振信号增强、峰面积增大,两者具有显著的相关性,拟合方程为y=7 436.46x + 153.32(R²=0.993)。核磁共振成像技术通过图片明暗的不同,直观地呈现出不同阶段的水分含量。【结论】干基含水率与核磁共振横向弛豫时间、弛豫峰面积之间有较好的相关性,可以利用低场核磁技术快速检测出银杏白果中的水分含量。通过核磁共振图谱也可以直观地观察银杏白果内部水分含量的变化。

关键词: 银杏白果, 水分迁移, 干燥, 低场核磁共振, 横向弛豫时间

Abstract:

【Objective】 The water composition of Ginkgo biloba seeds plays an important role in its physiological metabolism and affects its quality. Information about moisture distribution and migration inG. biloba seeds during hot air drying can provide data to optimize drying and rapidly determine the water content during storage. 【Method】The Carr-Purcell-Meiboom-Gill decay signals were obtained during hot air drying of G. biloba seeds by low-field nuclear magnetic resonance (NMR) equipped with a 0.5 T permanent magnet and proton resonance frequency of 21 MHz at a temperature of 32℃. The transverse relaxation time (T₂) was calculated based on the decay signal data using the SIRT algorithm, which provides the position and area of each peak. NMR images were obtained by SE imaging sequence. 【Result】 The drying rate increased with an increase in the air temperature during hot air drying. For all states of water, T₂ followed a decreasing trend during drying. The states of water could be classified into three main categories: bound water (0.79-7.32 ms), weakly bound water (13.67-89.07 ms), and free water (109.70-1 072.27 ms). The moisture state ofG. biloba seeds changed, and free water and weakly bound water were gradually removed during hot air drying. Increased water content significantly correlated with stronger NMR signals and larger peak areas. This phenomenon can be described by this equation: y = 7 436.46 x + 153.32 (R²= 0.993). NMR imaging was used to visualize proton images at different stages in the light and dark. 【Conclusion】 There is a high correlation between moisture content and NMR relaxation peak value. The water content of G. biloba seeds can also be observed directly using a nuclear magnetic map.

Key words: ginkgo seed, moisture transformation, dry, low field-nuclear magnetic resonance, transverse relaxation time

中图分类号:

S792.95

孙旭,姜东,徐莉,等. 银杏白果干燥过程中水分分布及迁移的变化[J]. 南京林业大学学报（自然科学版）, 2019, 43(6): 188-192.

SUN Xu, JIANG Dong, XU Li, HUA Tongtong, XUAN Yan, CAO Fuliang. Moisture distribution and migration of Ginkgo biloba seeds during air drying process[J].Journal of Nanjing Forestry University (Natural Science Edition), 2019, 43(6): 188-192.DOI: 10.3969/j.issn.1000-2006.201808008.

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样品序号 No.	T₂₁			T₂₂			T₂₃
样品序号 No.	起始点 starting point	峰点 peak point	结束点 end point	起始点 starting point	峰点 peak point	结束点 end point	起始点 starting point	峰点 peak point	结束点 end point
1	0.026	1.047	3.917	14.65	23.817	41.504	62.950	155.223	289.942
2	0.370	1.123	2.097	6.368	33.701	58.728	83.099	178.343	289.942
3	0.026	1.203	5.543	5.941	38.720	109.699	117.585	204.907	310.787
4	0.280	1.290	2.967	29.332	41.504	51.114	83.099	219.639	357.079
5	0.028	1.383	3.917	23.817	41.504	77.526	117.585	289.942	471.375
6	0.026	1.482	6.368	22.219	47.686	109.699	126.038	310.787	580.523
7	0.026	1.825	11.895	27.364	47.686	95.477	109.699	382.749	943.788
8	0.028	1.956	11.895	23.817	51.114	102.341	289.942	439.760	766.341
9	0.026	2.248	11.895	27.364	51.114	102.341	471.375	541.587	821.434
10	1.956	3.917	5.941	14.65	62.950	194.713	235.429	580.523	1 121.029
11	0.740	3.917	7.317	33.701	72.326	126.038	289.942	622.257	911.638
12	0.026	4.501	34.789	41.504	72.326	135.099	714.943	880.488	1 162.322

银杏白果干燥过程中水分分布及迁移的变化

Moisture distribution and migration of Ginkgo biloba seeds during air drying process

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