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A kind of test method of sodium content and sodium distribution

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

Active Publication Date: 2022-07-29
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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  • A kind of test method of sodium content and sodium distribution
  • A kind of test method of sodium content and sodium distribution
  • A kind of test method of sodium content and sodium distribution

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Experimental program
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Embodiment 1

[0038] The present embodiment provides a kind of test method of sodium content in the pickled product, and the concrete steps are as follows:

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

[0040] Use water and sodium chloride to configure calibration samples, which are denoted as calibration samples 1-6. The configuration method and sodium mass m are shown in Table 1.

[0041] Table 1 Configuration of calibration samples

[0042]

[0043]

[0044] Weigh the cucumber sample to be tested after pickling for 24 hours, 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 is calculated to be 1.0397g.

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

[0046]The NMI20-025H-I_sodium probe produced by Suzhou Nium...

Embodiment 2

[0057] The present embodiment provides a method for testing the distribution of sodium in the pickled product, which is specifically as follows:

[0058] Test the quality of the nano elements of the cucumber samples to be tested after pickling for 8 hours, 16 hours and 24 hours respectively (the actual sample sodium element quality is 0.32g, 0.57g, 1.04g), and obtain their grayscale images respectively, such as Figure 8 , 9, 10, the distribution of sodium in the samples at different pickling times can be observed through grayscale images. Parallel tests were performed 9 times, and the mass of sodium in the sample to be tested was calculated, as shown in Table 3 below:

[0059] Table 3 Calculated sodium element mass under three curing 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...

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Abstract

The invention discloses a method for testing sodium content and sodium distribution, comprising the following steps: S1: preparing a calibration sample and a sample to be tested; S2: putting the calibration sample into a nuclear magnetic analyzer, and measuring the sodium element in the calibration sample Grayscale image; S3: Convert the grayscale image obtained in S2 into a grayscale matrix by digital image processing, calculate the debasing grayscale matrix sum of each calibration sample, and then obtain the sodium mass and debasing grayscale matrix sum The least squares linear regression equation of equation to calculate the sodium content in the sample to be tested. The testing method disclosed by the invention has the advantages of simple operation, short testing time, non-destructive testing, good stability and high precision during multiple tests; for the testing of sodium distribution, the change of sodium with the pickling time can be observed, and pickling quality can be improved.

Description

technical field [0001] The invention relates to the field of food detection, in particular to a method for testing sodium content and sodium distribution. Background technique [0002] Pickling food is a common food processing method, and the resulting pickled products are deeply loved by everyone. In the process of pickling, salt is often added to increase the taste of pickled products and inhibit the reproduction of harmful microorganisms, thus playing a role of antiseptic. 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 the determination of sodium content at home and abroad mainly include spectrophotometry (ASS), gas chromatography, liquid chromatography and so on. However, the process of sample processing in spectrophotometry is cumbersome, susceptible to impurity interference, and has poor sensitivity; gas chromatography...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N24/08
CPCG01N24/08
Inventor 杨培强卢丙
Owner SHANGHAI NIUMAI ELECTRONICS TECH
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