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Method for measuring residual quantity of paraquat in food

A method of determination, paraquat technology, applied in the field of determination of paraquat residues in food, achieving good repeatability, high sensitivity, and reduced matrix interference

Inactive Publication Date: 2014-06-18
INSPECTION & QUARANTINE TECH CENT SHANDONG ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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  • Description
  • Claims
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Problems solved by technology

[0007] Another object of the present invention is to provide a sample pretreatment method to make up for the deficiency that the existing internationally widely recognized QuEChERS method cannot be used for the detection of paraquat residues

Method used

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  • Method for measuring residual quantity of paraquat in food
  • Method for measuring residual quantity of paraquat in food
  • Method for measuring residual quantity of paraquat in food

Examples

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Embodiment 1

[0038] Example 1: Detection of paraquat residues in apples

[0039] (1) Sample pretreatment

[0040] Weigh 10.0 g of the homogenized apple sample into a 50 mL stoppered plastic centrifuge tube, add 10 mL of aqueous methanol, vortex for 1 min, and centrifuge at 5000 r / min for 5 min. After centrifugation, take 2 mL of the supernatant extract into a centrifuge tube containing 100 mg of C18 and 100 mg of PSA, vortex for 1 min, and centrifuge at 5000 r / min for 3 min. After the supernatant was passed through a 0.22 μm filter membrane, the obtained sample liquid was determined by liquid chromatography-quadrupole time-of-flight tandem mass spectrometry (LC-Q TOF).

[0041] (2) Preparation of standard working solution

[0042]Weigh 25±0.1mg of the standard product into a 25mL plastic volumetric flask, dissolve it with acetonitrile, and dilute to obtain a 1000.0μg / mL standard stock solution; pipette 1.0mL of the standard stock solution into a 100mL plastic volumetric flask, and dilute...

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Abstract

The invention discloses a method for measuring residual quantity of paraquat in food. The sample pretreatment comprises the following steps: extracting paraquat in a food sample by using an aqueous solution of methanol, purifying the extracting solution by selecting C18 and a PSA dispersive solid-phase extraction agent, and finally, combining with high performance liquid chromatography-quadrupole rod flight time mass spectrometer, and carrying out qualitative and quantitative measurement of the residual paraquat in the food through accurate mass number of compound ions. The matrix interference in the process of detecting the paraquat residues in the food can be effectively reduced, the average recovery rate is 80.6-96.8 percent, the relative standard deviation is 3.9-7.1 percent, the quantitative limit is 10 micro-g / kg, the method has the advantages of simple and convenient operation, rapidness, accuracy, high sensitivity and high repeatability and is supplement and improvement of an existing QuEChERS method, the technical requirements on safety detection of corresponding products in China, European Union, America and Japan can be completely met, and a powerful technical support is provided for guaranteeing food safety of Chinese people and sound development of export abroad trade.

Description

technical field [0001] The invention belongs to the technical field of measuring pesticide residues, in particular to a method for measuring paraquat residues in food. Background technique [0002] During the planting of fruits, vegetables, grains and other crops, farmland weeds have an important impact on crop yield and quality. The use of herbicides in agricultural production not only saves a lot of heavy weeding manual labor and mechanical weeding operations, but more importantly, reduces the loss of agricultural product yield and quality caused by weeds, and obtains considerable economic benefits. However, with people's attention to food safety issues, the hazards of herbicide residues to human health have also attracted much attention. [0003] The chemical name of paraquat is 1,1,-dimethyl-4,4,-bipyridyl cation, which belongs to organic heterocyclic quaternary ammonium salt herbicides. As a broad-spectrum herbicide, it is widely used. In 2011, the sales of paraquat r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/88
Inventor 刘靖靖王建华宫萍
Owner INSPECTION & QUARANTINE TECH CENT SHANDONG ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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