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Accurate detection method for pesticide residues in agricultural products

A technology for pesticide residues and detection methods, applied in measuring devices, instruments, scientific instruments, etc., can solve problems affecting pesticide residue pollution control, and achieve the effects of simple operation, good repeatability and high sensitivity

Active Publication Date: 2020-11-03
广东集菜送食品科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the long-standing scientific and technological "bottleneck" is also an important factor affecting the control of pesticide residue pollution
Due to the characteristics of agricultural production and food consumption in our country, it is still impossible to truly realize the whole process management from "farm to table". Therefore, market supervision and monitoring has become the last hurdle and the most important line of defense to control pesticide residues polluting food.

Method used

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  • Accurate detection method for pesticide residues in agricultural products
  • Accurate detection method for pesticide residues in agricultural products
  • Accurate detection method for pesticide residues in agricultural products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] An accurate detection method for pesticide residues in agricultural products, comprising the following steps:

[0048] S1. Finely grind the apples with a colloid mill at a speed of 2000 rpm for 10 minutes to obtain a slurry;

[0049] S2. Take 5g of slurry, 10g of deionized water, and 1g of acetonitrile and add them into a plugged centrifuge tube with a capacity of 25mL. Mix with an oscillator at 300r / min for 5min, then add 45mg of magnetic nanoparticles, and continue to shake with an oscillator at 300r / min. 12min;

[0050] S3. Put the magnet on the side wall of the centrifuge tube with a stopper, the magnetic nanoparticles are adsorbed on the side wall close to the magnet, discard the liquid, and wash the magnetic nanoparticles with deionized water for 3 times, and the amount of washing water for each time is 3mL ;

[0051] S4. Use 2 mL of organic solvent to ultrasonically elute the magnetic nanoparticles in the plugged centrifuge tube for 6 minutes, elute the pestici...

Embodiment 2

[0060] An accurate detection method for pesticide residues in agricultural products, comprising the following steps:

[0061] S1. Finely grind the bananas with a colloid mill at a speed of 2000 rpm for 10 minutes to obtain a slurry;

[0062] S2. Take 5g of slurry, 10g of deionized water, and 1g of acetonitrile and add them into a plugged centrifuge tube with a capacity of 25mL. Mix with an oscillator at 300r / min for 5min, then add 45mg of magnetic nanoparticles, and continue to shake with an oscillator at 300r / min. 12min;

[0063] S3. Put the magnet on the side wall of the centrifuge tube with a stopper, the magnetic nanoparticles are adsorbed on the side wall close to the magnet, discard the liquid, and wash the magnetic nanoparticles with deionized water for 3 times, and the amount of washing water for each time is 3mL ;

[0064] S4. Use 2 mL of organic solvent to ultrasonically elute the magnetic nanoparticles in the plugged centrifuge tube for 6 minutes, elute the pestic...

Embodiment 3

[0073] An accurate detection method for pesticide residues in agricultural products, comprising the following steps:

[0074] S1. Finely grind the strawberries with a colloid mill at a speed of 2000 rpm for 10 minutes to obtain a slurry;

[0075] S2. Take 5g of slurry, 10g of deionized water, and 1g of acetonitrile and add them into a plugged centrifuge tube with a capacity of 25mL. Mix with an oscillator at 300r / min for 5min, then add 45mg of magnetic nanoparticles, and continue to shake with an oscillator at 300r / min. 12min;

[0076] S3. Put the magnet on the side wall of the centrifuge tube with stopper, the magnetic nanoparticles are adsorbed on the side wall close to the magnet, discard the liquid, and wash the magnetic nanoparticles with deionized water for 3 times, and the amount of washing water for each time is 3mL ;

[0077] S4. Use 2 mL of organic solvent to ultrasonically elute the magnetic nanoparticles in the plugged centrifuge tube for 6 minutes, elute the pes...

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Abstract

The invention discloses a precise detection method for pesticide residues in agricultural products. The method comprises the steps that the surface of ferroferric oxide is modified to obtain magneticnano particles, trace substances in samples can be selectively absorbed, then separation is further conducted, a proper elution solvent is adopted for eluting out target substances to be detected, andsolid-liquid separation can be conducted only through a magnet. Compared with a traditional solid-phase extraction method, a magnetic extraction method has a wider application range for the samples,and the analysis method is easy and convenient to operate, quick, efficient, environmentally friendly, accurate, reliable, high in sensitivity and good in repeatability. The method comprises the following steps that 1, fine grinding is conducted through a colloid mill; 2, vibration and mixing are conducted; 3, the magnet is placed on the side wall of a plug centrifugal tube for attraction; 4, an organic solvent is used for conducting ultrasonic elution and nitrogen-blowing concentration on the magnetic nano particles in the plug centrifugal tube, and liquid to be detected is obtained; 5, quantitative interior labels are added to the liquid to be detected, and the liquid to be detected is analyzed by using a GC / MS instrument.

Description

technical field [0001] The invention relates to a method for accurately detecting pesticide residues in agricultural products. Background technique [0002] Food safety is a major issue related to human health and national economy and people's livelihood. Due to the continuous expansion of the scale of pesticide use, the chronic and long-term effects of pesticide residues on human health have attracted increasing attention, so the restrictions on pesticide residues have become more and more stringent, such as detection objects, types, quantities, scopes, indicators And other aspects have put forward higher requirements and standards. Objectively speaking, the food safety problem caused by pesticide residue pollution is not only a major public health problem, but also a social problem, involving the construction of laws and regulations, the level of management and supervision, the quality of food producers and operators, and the consumption concept of the whole society. How...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/06G01N30/88
CPCG01N30/06G01N30/88G01N2030/045G01N2030/062G01N2030/8809
Inventor 杨伟雄李银满
Owner 广东集菜送食品科技有限公司