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Method for testing sodium content and sodium distribution

A test method and technology for sodium content, applied in the direction of analysis by nuclear magnetic resonance, etc., can solve the problems of cumbersome process, damage to the sample to be tested, poor stability, etc., and achieve the effects of simple operation, shortened detection time, and good stability.

Active Publication Date: 2021-05-25
SHANGHAI NIUMAI ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the cumbersome process, poor stability, and damage to the sample to be tested when detecting sodium in the prior art, thereby providing a method for testing the sodium content and Sodium distribution method

Method used

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  • Method for testing sodium content and sodium distribution
  • Method for testing sodium content and sodium distribution
  • Method for testing sodium content and sodium distribution

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Experimental program
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Embodiment 1

[0038] The present embodiment provides a method for testing sodium content in pickled products, the specific steps are as follows:

[0039] (1) Prepare calibration samples and samples to be tested:

[0040] Water and sodium chloride were used to configure calibration samples, which were denoted as calibration samples 1-6, and their configuration methods and sodium mass m are shown in Table 1.

[0041] Table 1 Configuration of Calibration Samples

[0042]

[0043]

[0044] Weigh the cucumber sample after pickling for 24 hours, and the mass is 18.5934g. By comparing the sodium chloride put in before pickling and the remaining amount of sodium chloride after pickling, the actual sodium mass in the cucumber sample to be tested was calculated to be 1.0397g.

[0045] (2) Put the calibration sample into the nuclear magnetic analyzer, and measure the grayscale image of the sodium element in the calibration sample:

[0046]Using the NMI20-025H-I_sodium probe produced by Suzhou...

Embodiment 2

[0057] The present embodiment provides a kind of test method of sodium distribution in pickled products, specifically as follows:

[0058] Test the sodium element mass of the cucumber sample to be tested after pickling for 8 hours, 16 hours, and 24 hours (the actual sample sodium element mass is 0.32g, 0.57g, and 1.04g), and obtain its grayscale image respectively, as Figure 8 , 9, 10, the distribution of sodium in the sample at different curing times can be observed through the grayscale image. Parallel test 9 times, calculate the mass of sodium in the sample to be tested, as shown in Table 3 below:

[0059] Table 3 The mass of sodium element calculated under three pickling times

[0060] 8 hours 16 hours 24 hours 1 0.29 0.53 0.98 2 0.31 0.55 1.05 3 0.32 0.55 1.05 4 0.31 0.55 1.00 5 0.31 0.56 0.98 6 0.31 0.53 0.99 7 0.31 0.55 1.03 8 0.30 0.53 0.99 9 0.32 0.56 1.03 average value 0.31 0.55 ...

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Abstract

The invention discloses a method for testing sodium content and sodium distribution. The method comprises the following steps: S1, preparing a calibration sample and a to-be-tested sample; s2, putting the calibration sample into a nuclear magnetic analyzer, and measuring a grey-scale map of a sodium element in the calibration sample; s3, performing digital image processing on the grey-scale map obtained in the S2, converting the grey-scale map into a grey-scale matrix, calculating a base-removed grey-scale matrix sum of each calibration sample, and then obtaining a least square linear regression equation of the sodium mass and the base-removed grey-scale matrix sum; s4, putting the to-be-detected sample into a nuclear magnetic analyzer, measuring a grey-scale map of a sodium element in the to-be-detected sample, and meanwhile, obtaining a sodium distribution condition in the to-be-detected sample; and S5, calculating the sodium content in the sample to be detected according to the regression equation obtained in S3. The test method disclosed by the invention is simple to operate, short in detection time, capable of realizing nondestructive detection, and good in stability and high in precision during multiple tests; and the change of sodium along with the pickling time can be observed through the sodium distribution test, so that the pickling quality is improved.

Description

technical field [0001] The invention relates to the field of food testing, in particular to a testing method for sodium content and sodium distribution. Background technique [0002] Pickling food is a common food processing method, and the pickled products obtained are deeply loved by everyone. During the pickling process, salt is often added to increase the taste of the pickled products and inhibit the reproduction of harmful microorganisms to play a preservative role. Table salt is mainly sodium chloride, and its high sodium content not only affects the taste of food, but also induces various diseases, affecting people's life and health. . At present, the methods for determining sodium content at home and abroad mainly include spectrophotometry (ASS), gas chromatography, and liquid chromatography. However, the process of sample processing in spectrophotometry is cumbersome, easily interfered by impurities, and has poor sensitivity; gas chromatography has long detection...

Claims

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Application Information

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IPC IPC(8): G01N24/08
CPCG01N24/08
Inventor 杨培强卢丙
Owner SHANGHAI NIUMAI ELECTRONICS TECH
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