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Method for determining 101 pesticide residues in medlar

A technology of pesticide residues and wolfberry, applied in the field of analytical chemistry, can solve the problems of decreased accuracy of detection results, loss of pesticide residues to be tested, cumbersome processing steps, etc., achieve accurate and reliable results, promote import and export trade, repeatability and accuracy good sex effect

Active Publication Date: 2019-01-25
SHANDONG AGRICULTURAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pretreatment steps of the above method are cumbersome and complicated, and it is also very easy to cause the loss of the pesticide residue to be tested, which makes the accuracy of the test result decrease.

Method used

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  • Method for determining 101 pesticide residues in medlar
  • Method for determining 101 pesticide residues in medlar
  • Method for determining 101 pesticide residues in medlar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Preparation: Lycium barbarum samples were pulverized evenly, and stored at low temperature and protected from light.

[0070] Extraction: Weigh 5g of wolfberry powder (accurate to 0.01g) into a 50mL centrifuge tube with a cover, add 10mL of water to fully infiltrate, let stand for 10min, add 15mL of acetonitrile extract, vortex for 1min, add AOAC 2007.01 extraction salt bag, vigorously Shake for 1 min, and centrifuge for 5 min at a standard speed of 5000 r / min.

[0071] Purification: Take the Sin-QuEChERS Nano purification tube, insert it into the centrifuge tube containing the extraction solution, press down slowly, so that about 4mL of the purification solution enters the reservoir, absorb the supernatant and filter it through a 0.22μm organic phase filter membrane and wait for LC-MS / MS analysis.

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Abstract

The invention provides a method for determining 101 pesticide residues in medlar, and belongs to the technical field of analytic chemistry. The method comprises the steps of 1 pretreating a sample, wherein an acetonitrile extracting solution is added into the smashed medlar sample, and then extraction salt is added for performing extraction; S2, performing purification, wherein a Sin-QuEChERS Nanopurification pipe is adopted for performing purification, and after a supernate is filtered, LC-MS / MS analysis is performed. Experiments prove that by adopting the method, the pesticide separation effect is good, on the basis of labelling recycling rate and precision experiment calculation, the measured result is accurate and reliable, the detection limit, the quantitation limit and various otherindexes of the method meet the requirement for multiple pesticide residue analysis, the method can be applied to qualitative and quantitative detection for various pesticide residues in medlar, the import and export trade for medlar in China can be promoted, and that great significance in ensuring human body health is achieved.

Description

technical field [0001] The invention belongs to the technical field of analytical chemistry and relates to the detection of pesticide residues, in particular to a method for detecting 101 kinds of pesticide residues in wolfberry based on multi-wall carbon nanotube purification combined with liquid chromatography-mass spectrometry / mass spectrometry. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and should not be considered as an acknowledgment or any form of suggestion that the information constitutes the prior art that is already known to those skilled in the art. [0003] The problem of pesticide chemical pollutant residues has become one of the major food safety issues of common concern to the international community. At present, there are more than 2,000 registered pesticides in the world, of which about 500 are commonly used, and new pes...

Claims

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Application Information

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IPC IPC(8): G01N30/06G01N30/88
CPCG01N30/06G01N30/88
Inventor 王明林陈佳楠王明辉王建华
Owner SHANDONG AGRICULTURAL UNIVERSITY
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