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Application of terahertz spectroscopy in identifying aged agricultural products

An agricultural product, terahertz technology, applied in the field of terahertz spectroscopy in the identification of aged agricultural products, can solve the problems of insufficient chemical properties of substances, damage to sensitive chemical components, and high X-ray energy, to ensure healthy diet, wide application range, simple steps

Active Publication Date: 2016-04-13
BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although X-rays can penetrate thicker samples, the analysis of the chemical properties of substances is not as good as infrared spectroscopy, and X-rays have high energy, which may destroy some sensitive chemical components in the measured substances.

Method used

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  • Application of terahertz spectroscopy in identifying aged agricultural products
  • Application of terahertz spectroscopy in identifying aged agricultural products
  • Application of terahertz spectroscopy in identifying aged agricultural products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Compress the fresh non-aged wheat flour sample into tablets, weigh 0.15g of the wheat flour sample with an analytical balance with a sensitivity of 0.1mg, and put it into an infrared tablet compression mold with an inner diameter of 13mm; The time is 5 minutes, and it is pressed into a sheet with a thickness of about 1mm.

[0046] Collect terahertz spectra of non-aged wheat flour samples.

[0047] Operating software: MVDSP-400ControllerV1.1;

[0048] Temperature in the sample chamber: 22±5°C;

[0049] Relative humidity in the sample chamber: 0.0%;

[0050] Bias voltage: 100V;

[0051] Phase lock time constant: 100ms;

[0052] Scanning starting position: 24.600mm;

[0053] Scanning end position: 27.600mm;

[0054] Scanning rate: 0.002mm / s;

[0055] Repeat the above operation to collect the terahertz spectrum of the aged wheat flour sample tablet.

[0056] According to the terahertz time-domain spectrum of wheat flour obtained by scanning, that is, the amplitude i...

Embodiment 2

[0062] Select non-aged wheat flour samples of different types and different origins and their corresponding aged wheat flour samples for comparison according to the method described in Example 1. Taking soft winter wheat from Jiangsu (non-aged sample 1) and hard winter wheat from Beijing (non-aged sample 2) as examples, the results of terahertz spectroscopy are as follows: Figure 4 shown. Specifically, the result is:

[0063] The peak time of non-aged sample 1 is 8.13ps, and the corresponding peak time of aged sample 1 is 7.90ps, the difference between the two is 0.23ps (greater than 0.1ps), the time lag is very obvious, and the amplitude also has a very obvious attenuation;

[0064] The peak time of the non-aged sample 2 is 7.78ps, and the peak time of the corresponding aged sample 2 is 7.94ps, the difference between the two is 0.16ps (greater than 0.1ps), the time lag is very obvious, and the amplitude also has a very obvious attenuation.

[0065] It can be seen that the ...

Embodiment 3

[0067] Using the operation process of Example 1, 50 kinds of commercially available wheat flour from different production provinces and different production batches were identified and tested to determine whether they were aged, and the results of the identification were passed through traditional gluten water holding capacity and sensory methods, etc. The method was validated and the accuracy rate was higher than 95%.

[0068] The identification and detection process of the embodiment of the present invention is also applicable to common grain agricultural products, such as wheat flour, rice, tapioca flour, corn, sorghum, millet, sweet potato, potato and the like.

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Abstract

The invention relates to an application of a terahertz wave spectrum method to identifying an aged agricultural product. The application utilizes the characteristic that terahertz waves have relatively good penetrability on substances and have responses to substance molecules to find that the terahertz wave spectrum method can be used for identifying the aged agricultural product. A terahertz wave spectrum not only can collect information of the surface of a sample to be detected and can collect information of the inner part of the sample to be detected to the deeper extent, so that whether the agricultural product is aged or not can be suitably judged and the effect is reliable. When the terahertz wave spectrum method is used for identifying the aged agricultural product, steps are simple, the operation is simple and convenient, no pollution and no loss exist, and the speed is high.

Description

technical field [0001] The invention relates to the field of food safety, in particular to the use of terahertz spectroscopy in identifying aged agricultural products. Background technique [0002] Grain is an essential means of living for people, especially wheat flour and rice, which are the main source of people's daily food. Its quality is directly related to people's living standards. However, in recent years, the quality and safety of food has attracted widespread attention from all walks of life. Aged food will directly affect people's dietary health. Therefore, it is necessary to find a fast, simple, easy and green method for identifying aged grains. [0003] Existing non-destructive analysis methods mostly use infrared spectroscopy. Due to its limited penetration ability, it can only detect the surface of the sample to be tested or a limited depth into the sample, which is limited in the depth and representativeness of the sample. For the actual stored agricultu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3563G01N21/3586
Inventor 马智宏王冬韩平平华潘立刚王纪华
Owner BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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