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Method for determining pesticide residue in tea

A technology for pesticide residues and pesticide residues, applied in the field of analysis and detection, can solve problems such as affecting detection precision and accuracy, low triazole pesticide residues, loss of components to be tested, etc., to improve extraction efficiency and detection accuracy, excellent Purification of extraction properties and reduced sample loss

Active Publication Date: 2016-02-24
HUBEI CHIBI ZHAO LIQIAO TEA IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its unreasonable use will cause potential health threats to humans and pollute the ecological environment, and its residues in food have attracted more and more attention.
[0003] Due to the low amount of triazole pesticide residues in tea leaves, traditional liquid-liquid extraction or SPE cartridges are usually used for extraction. Various solvents are used in the whole process, and the operation steps are cumbersome, resulting in a large loss of the components to be tested. The extraction efficiency Not high, affecting the final detection precision and accuracy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] In order to further explain the detection of triazole pesticide residues in tea leaves by gas chromatography-mass spectrometry, a more detailed description will be given below with examples.

[0019] 1. Test part

[0020] (1) Sample pretreatment: take 2g of tea leaves and grind them, dissolve them in 100ml of deionized water, and use 6ml of acetonitrile-acetone solution with a volume ratio of 2:3 for ultrasonic extraction. The ultrasonic time is 15 minutes, and then centrifuged for 8 minutes. At 10000r / mmin, the extract was obtained.

[0021] (2) Stir bar solid-phase extraction: a stir bar coated with cellulose-graphene coating was immersed in the above extract, and stirred by magnetic stirring for 15 min in a closed environment to perform solid-phase extraction.

[0022] Among them, the preparation method of the cellulose-graphene coating is as follows: through esterification, use cellulose to modify the surface of graphene to obtain, and the prepared cellulose-modifi...

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PUM

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Abstract

The invention provides a method for determining pesticide residue in tea. The method comprises the following steps: (1) pretreatment of a sample: a step of crushing tea leaves, dissolving the crushed tea leaves with water, then carrying out ultrasonic extraction with an acetonitrile-acetone solution and then carrying out centrifugation so as to obtain extract liquor; (2) solid phase extraction with a stirring bar: a step of soaking a stirring bar coated with a polymer-graphene coating in the extract liquor and carry out carrying out solid phase extraction; and (3) gas chromatographic-mass chromatographic detection, wherein the pesticide residue is triazole pesticide residue and the polymer-graphene coating on the stirring bar is a cellulose-graphene coating. The method can realize high-efficiency and convenient detection of pesticide residue in tea.

Description

technical field [0001] The invention belongs to the technical field of analysis and detection, and in particular relates to a method for checking the residual amount of triazole pesticides in tea by using gas chromatography-mass spectrometry. Background technique [0002] Triazole pesticides are organic heterocyclic compounds, which can kill bacteria and regulate plant growth. Some triazole compounds can strongly inhibit the formation of ergosterol in pathogenic bacteria, exhibit a strong bactericidal effect, and have a plant growth regulating effect; some triazole compounds can prevent the formation of auxin and gibberellin in plants, showing strong The plant growth inhibitory effect can control the growth of crops, achieve the effect of disease prevention and lodging resistance, and also has a bactericidal effect. In the mid-1970s, the first triazole fungicide triadimefon came out, creating a new category of fungicides. Because of its high-efficiency, systemic, and broad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/88G01N30/06
CPCG01N30/06G01N30/88
Inventor 袁晓林
Owner HUBEI CHIBI ZHAO LIQIAO TEA IND CO LTD
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