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Method for detecting moisture content in aquatic products by using low-field nuclear magnetic resonance technology

A low-field nuclear magnetic resonance and low-field nuclear magnetic technology, which is applied in the direction of analysis by nuclear magnetic resonance, weighing by removing certain components, and material analysis by resonance, can solve cumbersome and laborious tasks, destroy samples, and easily breed microorganisms, etc. problems, to achieve the effect of simple operation process, improved measurement efficiency and short analysis time

Pending Publication Date: 2019-12-20
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, fresh aquatic products have a large water content, are prone to breed microorganisms, and have poor stability, which is not conducive to storage, transportation and processing. In order to ensure the shelf life of aquatic products, it is very important to detect the moisture changes of aquatic products during processing and storage. necessary
[0003] At present, the traditional methods for detecting moisture content are mainly dry constant weight method, distillation method, etc. Although these methods have high accuracy and good repeatability, they also have problems such as time-consuming, large errors, tedious and laborious, and damage to samples.

Method used

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  • Method for detecting moisture content in aquatic products by using low-field nuclear magnetic resonance technology
  • Method for detecting moisture content in aquatic products by using low-field nuclear magnetic resonance technology
  • Method for detecting moisture content in aquatic products by using low-field nuclear magnetic resonance technology

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Effect test

Embodiment 1

[0046] The method of using low-field nuclear magnetic resonance technology to detect the moisture content in dried sea cucumbers includes the following steps:

[0047] S1. Low-field NMR analysis: Take 100 fresh sea cucumbers to be tested and perform low-field NMR analysis respectively. Use CPMG pulse sequence method to collect NMR echo signals, collect the signals 3 times each time, and obtain echo attenuation by inversion Curve data, that is, transverse relaxation data obtained by multi-exponential fitting;

[0048] Among them, the sampling parameters are set as: 90 degree pulse width P1: 13us, 180 degree pulse width P2: 25.04us, re-sampling waiting time Tw: 0.01~10000ms, analog gain RG1: 10, digital gain DRG1: 3, pre-amplification gain PRG: 2, NS: 4, NECH: 700, receiver bandwidth SW: 100KHz, start sampling time control parameter RFD: 0.08ms, time delay DL1: 0.38748ms;

[0049] S2. Sample weighing: Determine the moisture content of dried sea cucumbers after step S2 low-field nuclea...

Embodiment 2

[0059] The method of using low-field nuclear magnetic resonance technology to detect the moisture content in instant shrimps includes the following steps:

[0060] S1. Low-field NMR analysis: Take 50 ready-to-eat shrimps to perform low-field NMR analysis. Use CPMG pulse sequence method to collect NMR echo signals, collect the signals 3 times each time, and obtain the echo attenuation curve by inversion Data, that is, transverse relaxation data obtained by multi-exponential fitting;

[0061] Among them, the sampling parameters are set as: 90 degree pulse width P1: 12us, 180 degree pulse width P2: 25.44us, re-sampling waiting time Tw: 0.01~10000ms, analog gain RG1: 10, digital gain DRG1: 3, pre-amplification gain PRG: 2, NS: 4, NECH: 850, receiver bandwidth SW: 100KHz, start sampling time control parameter RFD: 0.08ms, delay DL1: 0.38728ms;

[0062] S2. Sample weighing: Determine the moisture content of the instant shrimp after the low-field nuclear magnetic analysis in step S2 accord...

Embodiment 3

[0072] The method of using low-field nuclear magnetic resonance technology to detect the moisture content in instant scallops includes the following steps:

[0073] S1. Low-field NMR analysis: Take 200 ready-to-eat scallop rods to be tested and perform low-field NMR analysis respectively. Use the CPMG pulse sequence method to collect NMR echo signals. The signals are collected 3 times each time, and the echo attenuation is obtained by inversion. Curve data, that is, transverse relaxation data obtained by multi-exponential fitting;

[0074] Among them, the sampling parameters are set as: 90 degree pulse width P1: 15us, 180 degree pulse width P2: 28us, re-sampling waiting time Tw: 0.01~10000ms, analog gain RG1: 10, digital gain DRG1: 3, preamplification gain PRG : 2, NS: 4, NECH: 1000, receiver bandwidth SW: 100KHz, start sampling time control parameter RFD: 0.08ms, time delay DL1: 0.386ms;

[0075] S2. Sample weighing: Measure the moisture content of the instant scallop sticks after ...

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Abstract

The invention discloses a method for detecting moisture content in aquatic products by using a low-field nuclear magnetic resonance technology. According to the method, the low-field nuclear magneticresonance technology is combined with a drying weight loss method to determine the moisture content, and a prediction model of the moisture content of a sample is constructed based on nuclear magneticrelaxation data and the moisture content, so that the moisture content of an aquatic product with unknown moisture content is predicted; the moisture content in the sample can be rapidly and precisely measured without being influenced by substances on the surface of the sample, and the problems of poor effect, long consumed time and the like of a traditional aquatic product moisture content measuring method are effectively solved; an important technical support is provided for raw material quality control and aquatic product research of aquatic product processing enterprises; and the application range of the low-field nuclear magnetic resonance technology in aquatic product detection and research is expanded, and the development prospect of the low-field nuclear magnetic resonance technology is promoted. The method can achieve the purpose of quickness and no damage, and realizes quick detection of the water content of the aquatic products.

Description

Technical field [0001] The invention relates to the field of food detection, and more specifically, to a method for detecting moisture content in aquatic products based on low-field nuclear magnetic resonance technology combined with chemometric method. Background technique [0002] Aquatic products are rich in nutrients such as polyunsaturated fatty acids, proteins, vitamins, etc., which have extremely high nutritional value and have many functions such as enhancing the body's immunity. Moisture content is an important component of aquatic products, as well as an important indicator for evaluating the quality and safety of aquatic products. On the one hand, the moisture content, distribution and existence of aquatic products not only affect the nutritional value of aquatic products, but also affect the flavor of aquatic products. , Structure, texture, appearance, etc. have a greater impact. On the other hand, fresh aquatic products contain high water content, are easy to breed ...

Claims

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Application Information

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IPC IPC(8): G01N24/08G01N5/04G06F17/18
CPCG01N24/082G01N5/045G06F17/18
Inventor 谭明乾孙珊王偲琦周海博
Owner DALIAN POLYTECHNIC UNIVERSITY
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