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Analysis method for low field nuclear magnetic resonance nondestructive detection of Daqu moisture content

A low-field NMR and non-destructive testing technology, applied in the field of analytical chemistry, can solve the problems of cumbersome and time-consuming, difficult to realize the relative distribution of water in Daqu, sample damage, etc., and achieve the effect of rapid measurement, real-time online measurement and rapid response

Inactive Publication Date: 2017-10-13
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the above problems, the present invention provides an analysis method for rapid and non-destructive detection of water content in Daqu by low-field nuclear magnetic resonance, which solves the cumbersome time-consuming, sample damage and difficult-to-achieve detection of the relative distribution of water in Daqu in the traditional method of detecting water content in Daqu difficult problem, the present invention has optimized the method at the same time, obtained an optimal effect

Method used

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  • Analysis method for low field nuclear magnetic resonance nondestructive detection of Daqu moisture content
  • Analysis method for low field nuclear magnetic resonance nondestructive detection of Daqu moisture content
  • Analysis method for low field nuclear magnetic resonance nondestructive detection of Daqu moisture content

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Embodiment 1

[0033] 1. Purpose of the test

[0034] (1) Establish the calculation equation for low-field NMR detection of water content in Daqu;

[0035] (2) Detect the overall moisture content of the target Daqu sample.

[0036] 2. Test material

[0037] Daqu samples (in pieces and crushed).

[0038] 3. Test equipment

[0039] Low-field nuclear magnetic resonance instrument: MacroMR12-150H-I, produced by Suzhou Numei Company, field strength 0.35T, coil diameter 300mm, frequency 12.80MHz, temperature controlled in the range of 31.99-32.01℃; vacuum drying oven: DZF-6050B, Shanghai No. 1 Produced by Heng Technology Co., Ltd., the pressure is 133Pa, and the temperature is 60±1℃.

[0040] 4. Test process

[0041] (1) Accurately weigh 5g, 20g, 50g, 100g, 160g of the same crushed Daqu material and put it into an NMR tube to detect the first peak value. Take the mass as the abscissa and the first peak point value as the ordinate to perform linear regression, such as figure 1 As shown, the d...

Embodiment 2

[0055] Compared with Example 1, only the specific parameters of CPMG sequence analysis are different, and other steps or parameters are consistent with Example 1. The specific parameters of the CPMG sequence analysis adopted in this embodiment are as follows: 90° pulse width P1: 8 μs; 180° pulse width: 4 μs; receiver bandwidth SW: 200KHz; resampling waiting time TW: 500ms; time delay DL1: 0.50; Pre-amplification gain PRG: 2; analog gain RG1: 5; digital gain DRG1: 5; echo number Echonum: 1000; repeated sampling times NS: 8. The predicted moisture content is shown in Table 3.

[0056] Table 3. The real water content of Daqu samples and the predicted water content of the first peak point

[0057]

[0058] According to the above test data results (Table 3), the relative error between the actual value and the calculated value is between 5% and 8%.

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Abstract

Belonging to the technical field of analytical chemistry, the invention discloses an analysis method for low field nuclear magnetic resonance nondestructive detection of Daqu moisture content. The invention applies low field nuclear magnetic resonance analysis technology to Daqu moisture content analysis, and lays the foundation for rapid, nondestructive and on-line detection of Daqu moisture content. The method uses specific low field nuclear magnetic resonance equipment, and under the circumstance of determined optimal equipment parameters, utilizes CPMG sequence analysis means to perform equipment calibration on semaphore (first peak point) of T2 spectrum, and establishes a standard curve and standard equation of first peak value and Daqu moisture content so as to rapidly determine the Daqu moisture content. The invention provides the basis for nondestructive on-line moisture content detection of Daqu.

Description

technical field [0001] The invention relates to an analysis method for low-field NMR non-destructive detection of water in Daqu, belonging to the technical field of analytical chemistry. Background technique [0002] "Qu is the bone of wine", and Daqu plays a vital role in the production of sauce-flavored and Luzhou-flavored liquors. The purpose of its preparation is mainly to provide multi-functional bacterial strains, multi-enzyme systems, various flavor substances and their precursors for liquor fermentation, and also serve as part of raw materials. In the production process of Daqu, bacteria and yeast first grow inside the block, so that the temperature of the center of the koji rises, and the heat and water disperse to form a surface layer suitable for mold growth, and the mold begins to grow on the outer layer; then, with the distribution of water, Mold grows endogenously, and the curved surface gradually dries to form a closed layer. The biological heat generated by ...

Claims

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Application Information

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IPC IPC(8): G01N24/08
CPCG01N24/082
Inventor 葛向阳徐岩靳光远
Owner JIANGNAN UNIV
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