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Method for judging freeze drying precooling temperatures of tobacco leaf samples by aid of eutectic crystal points and eutectic melting points

A technology of eutectic point and eutectic point, which is applied in the direction of drying solid materials, drying solid materials without heating, tobacco, etc.

Active Publication Date: 2014-07-16
ZHENGZHOU TOBACCO RES INST OF CNTC
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Problems solved by technology

The current freeze-drying technology has been widely used and reported in food processing (Zhou Guoyan et al., 2010; Pan Qingfang and Zhou Guoyan, 2011; Chi Chunshan, 2010), and there is no related technology research in the sample pretreatment of plant metabolomics research. Aspects of reports

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  • Method for judging freeze drying precooling temperatures of tobacco leaf samples by aid of eutectic crystal points and eutectic melting points

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Samples of fresh tobacco leaves at different stages (cross-flowering stage, transplanting stage, budding stage) and tobacco leaves stored at -80°C were taken, and their heat flow curves were measured by differential scanning calorimetry. figure 1 Shown are the DSC heat flow curves of cruciferous tobacco leaves and tobacco leaves stored at -80°C. The eutectic points and eutectic points of the four samples are shown in Table 1. In order to save energy and improve drying efficiency, combined with the eutectic point and eutectic point of different fresh tobacco leaves, the primary drying temperature (or eutectic drying temperature) of tobacco samples was set at -20°C, and the secondary drying temperature (or eutectic drying temperature) was set at -20°C. drying temperature) is 0°C.

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Abstract

The invention discloses a method for judging freeze drying precooling temperatures of tobacco leaf samples by the aid of eutectic crystal points and eutectic melting points. The method is characterized in that freeze dryers are used as platforms, so that the eutectic crystal points and the eutectic melting points of the fresh tobacco leaf samples in different periods can be measured by the aid of a differential scanning calorimetry (DSC) process, and primary drying temperatures and secondary drying temperatures which are appropriate for fresh tobacco leaf sample freeze drying can be determined. The method has the outstanding advantages that energy-saving and efficient freezing temperatures can be determined on the center of a fresh tobacco leaf vacuum freeze drying process, the appropriate freeze drying process is provided for large quantities of fresh tobacco leaf samples, and accordingly purposes of energy conservation and high efficiency can be achieved.

Description

[0001] technical field [0002] The invention relates to a vacuum freeze-drying process, specifically a method for judging the freeze-drying pre-cooling temperature of a tobacco leaf sample by using the eutectic point and the eutectic point, using the VirTis pilot-type freeze-drying machine as a platform, through differential scanning calorimetry (DSC ) Measure the eutectic point and eutectic point of tobacco leaves in different periods, and determine the more suitable primary drying temperature and secondary drying temperature for freeze-drying fresh tobacco leaves, so as to achieve the purpose of energy saving and high efficiency. Background technique [0003] In the study of plant metabolomics, it is generally necessary to vacuum freeze-dry the samples. The so-called vacuum freeze-drying is also called sublimation drying. The principle is to freeze the material so that the water contained in it becomes ice, and then sublimates the ice under vacuum To achieve the purpose o...

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Application Information

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IPC IPC(8): A24B3/10A24B3/04F26B5/06
Inventor 刘萍萍周会娜陈千思翟妞金立锋陈霞郑庆霞林福呈卢鹏
Owner ZHENGZHOU TOBACCO RES INST OF CNTC
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