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Tea solid phase extraction column and sample pretreatment method for testing pesticide residues in tea leaves

A solid-phase extraction column and sample pretreatment technology, applied in separation methods, chemical instruments and methods, measuring devices, etc., can solve the problems that cannot be applied to the extraction and purification of pesticide residues, and achieve good adsorption and removal effects

Active Publication Date: 2013-05-22
天津博纳艾杰尔科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Patent 201010108788.X compensates for matrix effects by adding matrix simulants to standard products. C18 is added in the purification step to remove part of the fat-interfering matrix and avoid serious matrix interference in gas chromatography detection. However, it is based on The principle of matrix effect compensation is more suitable for the determination of organophosphorus pesticide residues in tea, but not for other types of pesticide residues
[0008] Finally, none of the above-mentioned existing patent methods can be applied to the extraction and purification of more than 600 kinds of pesticide residues

Method used

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  • Tea solid phase extraction column and sample pretreatment method for testing pesticide residues in tea leaves
  • Tea solid phase extraction column and sample pretreatment method for testing pesticide residues in tea leaves
  • Tea solid phase extraction column and sample pretreatment method for testing pesticide residues in tea leaves

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Embodiment 1

[0050] Use a high-density polyethylene column tube with a volume capacity of 6mL or 12mL. One end of the column tube 1 is the sample or solvent injection port 4, and the other end is the sample or solvent outflow port 5, which is filled with graphitized carbon, aminated silica gel NH2 , amidated polyethylene divinyl benzene three materials, in which aminated silica gel NH2 and amidated polyethylene divinyl benzene are mixed as a layer 2, graphitized carbon is used as a layer 3, and a polypropylene sieve plate 6 with a pore size of 20um is used as a layer Separation, both ends of the filler are sealed by sieve plates, filled with two layers of three materials mixed purification column, graphitized carbon, aminated silica gel NH2 and amidated polyethylene divinylbenzene three materials in the tea solid phase extraction column The mass ratio is 8:8:1, and the graphitized carbon is packed at the bottom of the column tube.

Embodiment 2

[0052] Use a high-density polyethylene column tube with a volume capacity of 6mL or 12mL. One end of the column tube 1 is the sample or solvent injection port 4, and the other end is the sample or solvent outflow port 5, which is filled with graphitized carbon, aminated silica gel NH2 , amidated polyethylene divinyl benzene three materials, in which aminated silica gel NH2 and amidated polyethylene divinyl benzene are mixed as a layer 2, graphitized carbon is used as a layer 3, and a polypropylene sieve plate 6 with a pore size of 20um is used as a layer Separation, both ends of the filler are sealed by sieve plates, filled with two layers of three materials mixed purification column, graphitized carbon, aminated silica gel NH2 and amidated polyethylene divinylbenzene three materials in the tea solid phase extraction column The mass ratio is 6:4:1, and the graphitized carbon is packed at the bottom of the column tube.

Embodiment 3

[0054] Use a glass column tube with a volume capacity of 6mL or 12mL. One end of the column tube 1 is the sample or solvent injection port 4, and the other end is the sample or solvent outflow port 5, which is filled with graphitized carbon, aminated silica gel NH2, amidated Polyethylene divinyl benzene three materials, in which aminated silica gel NH2 and amidated polyethylene divinyl benzene are mixed as a layer 2, graphitized carbon is used as a layer 3, and a polypropylene sieve plate 6 with a pore size of 20um is used as a separator and filler The two ends of the tea are sealed by sieve plates, filled with a two-layer mixed purification column of three materials, the mass ratio of graphitized carbon, aminated silica gel NH2 and amidated polyethylene divinylbenzene in the tea solid phase extraction column The ratio is 5:4:1, where the graphitized carbon is packed at the bottom of the column tube.

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Abstract

The invention relates to a tea solid phase extraction column and a sample pretreatment method for testing pesticide residues in tea leaves. The tea solid phase extraction column comprises a column pipe and filler in the column pipe, wherein, the filler comprises the following components: 2 to 10 parts of carbon material, 2 to 10 parts of amino-group functionalized adsorbent material and 1 part of polar functional group modified high-polymer materials; the carbon filler is filled in the bottom layer of the column pipe; the amino-group functionalized adsorbent material and the polar functional group modified polymer materials are mixedly filled in the upper layer of the column pipe and a polypropylene sieve plate is provided between the two layers for separation. The invention also discloses a sample pretreatment method for testing pesticide residues in tea leaves. By utilizing the tea solid phase extraction column in sample pretreatment, the pesticide and the metabolite in hundreds of kinds of tea such as black tea, green tea, scented tea, puerh tea can be analyzed and detected, and 653 kinds of pesticide residues can be extracted and purified through sample treatment for once. Therefore, the tea solid phase extraction column and the sample pretreatment method for testing pesticide residues in tea leaves is speedy, economical and is high in universality.

Description

technical field [0001] The invention relates to the fields of food hygiene and agricultural product safety detection, in particular to a tea solid-phase extraction column and a sample pretreatment method for detecting tea pesticide residues. Background technique [0002] Tea is not only a kind of main consumption beverage that Chinese people like, but also a traditional bulk export agricultural product of our country. In recent years, the issue of pesticide residues in tea has often been exposed by the media. In order to maintain their own economic interests and protect people's health, countries around the world continue to increase the maximum allowable residues (MRL) of pesticides in tea. Japan implemented the "Positive List System" for pesticides, veterinary drugs and related chemical substances in 2006, which involves a total of 144 varieties of tea, and adopts "uniform standards" for pesticide residues other than 144 kinds (that is, the benchmark value is set at 0.01p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D15/20B01D15/22G01N30/02G01N30/06
Inventor 庞国芳汪群杰曹彦忠胡雪燕王宛范春林
Owner 天津博纳艾杰尔科技有限公司
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