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Digital imaging system and method for rapid detection of organophosphorus pesticide residues in fruits and vegetables by using same

A digital imaging system, organophosphorus pesticide technology, applied in the preparation of test samples, measurement of color/spectral characteristics, material analysis by observing the influence of chemical indicators, etc., can solve the problem of not being able to fully obtain the spectrum of the measured target Information and spatial information, unstable results, difficult to meet the detection accuracy and other issues

Inactive Publication Date: 2014-07-16
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, direct use of spectral analysis technology for the detection of organophosphorus pesticide residues has problems such as unstable results and difficult detection accuracy to meet the quantitative requirements, while traditional image processing and spectral analysis cannot fully obtain the spectral information and spatial information of the measured target.
[0009] Therefore, although the hidden dangers of food safety caused by organophosphorus pesticide residues are gradually being paid attention to, so far, there is no very convenient and fast method for the detection of organophosphorus pesticide residues.

Method used

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  • Digital imaging system and method for rapid detection of organophosphorus pesticide residues in fruits and vegetables by using same
  • Digital imaging system and method for rapid detection of organophosphorus pesticide residues in fruits and vegetables by using same
  • Digital imaging system and method for rapid detection of organophosphorus pesticide residues in fruits and vegetables by using same

Examples

Experimental program
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Effect test

Embodiment 1

[0047] (1) Sample preparation

[0048] Dissolve 0.5 g of palladium chloride solid with 3 ml of glacial acetic acid for 10 minutes, add deionized water to dilute to 100 ml, and prepare a 0.5 wt % palladium chloride solution;

[0049] Prepare 2 ml of dimethoate solutions with concentrations of 16 ppm, 8 ppm, 4 ppm, 2 ppm and 1 ppm respectively.

[0050] The dimethoate solution of each concentration is evenly sprayed on 5 pollution-free green spinach, and is dried at room temperature for later use.

[0051] (2) Pretreatment process

[0052] Get 5 groups of 10g spinach samples sprayed with different concentrations of dimethoate solution, chop it and mix and stir with ethanol for 40 minutes, get supernatant 5ml, and filter with filter paper. Add 2ml of the prepared palladium chloride acetic acid solution to the 5 groups of samples respectively, shake it fully and let it rest for 5 minutes.

[0053] (3) Selected filter

[0054] Utilize spectrophotometer to gather its sample and ...

Embodiment 2

[0060] (1) Sample preparation

[0061] Dissolve 0.5 g of palladium chloride solid with 3 ml of glacial acetic acid for 10 minutes, add deionized water to dilute to 100 ml, and prepare a 0.5 wt % palladium chloride solution;

[0062] Prepare 2 ml of chlorpyrifos solutions with concentrations of 16 ppm, 8 ppm, 4 ppm, 2 ppm, 1 ppm and 0.5 ppm respectively.

[0063] The chlorpyrifos solution of each concentration was evenly sprayed on 6 pollution-free green spinach, and dried at room temperature for later use.

[0064] (2) Pretreatment process

[0065] Take 6 groups of 10g spinach samples sprayed with different concentrations of chlorpyrifos solutions, chop them up and mix them with ethanol for 40 minutes, take 5ml of the supernatant, and filter with filter paper. Add 2ml of the prepared palladium chloride acetic acid solution to the 6 groups of samples respectively, shake it fully and let it rest for 5 minutes.

[0066] (3) Selected filter

[0067] A spectrophotometer was use...

Embodiment 3

[0073] (1) Sample preparation

[0074] Dissolve 0.5 g of palladium chloride solid with 3 ml of glacial acetic acid for 10 minutes, add deionized water to dilute to 100 ml, and prepare a 0.5 wt % palladium chloride solution;

[0075] Prepare 2 ml of phoxim solutions with concentrations of 16 ppm, 8 ppm, 4 ppm, 2 ppm, 1 ppm and 0.5 ppm respectively.

[0076] The phoxim solution of each concentration was evenly sprayed on 6 pollution-free green spinach, and dried at room temperature for later use.

[0077] (2) Pretreatment process

[0078] Take 6 groups of 10 g spinach samples sprayed with different concentrations of phoxim solutions, chop them up and mix them with ethanol for 40 minutes, take 5 ml of supernatant, and filter with filter paper. Add 2ml of the prepared palladium chloride acetic acid solution to the 6 groups of samples respectively, shake it fully and let it rest for 5 minutes.

[0079] (3) Selected filter

[0080] A spectrophotometer was used to collect the vis...

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Abstract

The invention discloses a digital imaging system and a method for the rapid detection of organophosphorus pesticide residues in fruits and vegetables by using the same, belonging to the technical field of food safety detection. The digital imaging system comprises a light source supplying subsystem, an image acquisition subsystem and an optical platform. According to the method, images are constructed by using the digital imaging system, and a unitary linear regression model is constructed by taking gray values of the images as dependent variables and the concentration of a sample as an independent variable; and during detection, simple color reaction pretreatment is carried out on a sample to be detected, digital images of the sample under different sensitive wavelengths are obtained by using the digital imaging system, the gray values of the images are analyzed and used for being matched with a prediction and estimation model, then whether corresponding pesticide residues exceed the standards or not can be judged, and estimated values with higher accuracy can be obtained if the pesticide residues exist. The full analysis process only needs 5-10 minutes, and the detection sensitivity can reach 0.5 mg / kg.

Description

technical field [0001] The invention belongs to the technical field of food safety detection, and in particular relates to a digital imaging system and a method for rapidly detecting organophosphorus pesticide residues in fruits and vegetables. Background technique [0002] Statistics show that pesticides account for about 80% of the accidents caused by pesticide poisoning and death in my country, and among the pesticides, organophosphorus pesticides are the main ones, accounting for about 90%. Organic phosphorus remaining on fruits and vegetables or organic phosphorus in the environment enters the organism, most of which will inhibit the cholinesterase in the organism, making it lose the ability to decompose acetylcholine, resulting in the accumulation of acetylcholine and causing nerve function disorder, resulting in damage to the body. In recent years, the governments of various countries have increasingly strict requirements on the residue limits of organophosphorus pes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31G01N21/78G01N1/28
Inventor 孙明李文夏锦闻李民赞
Owner CHINA AGRI UNIV