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Method for detecting residual pesticide content in dairy product

A technology for residual pesticides and dairy products, applied in measurement devices, separation methods, chemical instruments and methods, etc., can solve the problems of time-consuming and labor-intensive, cumbersome extraction process, loss of target substances, etc. effect of loss

Active Publication Date: 2020-02-11
JUNLEBAO DAIRY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for detecting the content of residual pesticides in dairy products, which solves the problems of cumbersome extraction process of residual pesticides in dairy products, time-consuming and labor-consuming, and excessive loss of target objects

Method used

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  • Method for detecting residual pesticide content in dairy product
  • Method for detecting residual pesticide content in dairy product
  • Method for detecting residual pesticide content in dairy product

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Example 1 A method for detecting the content of residual pesticides in dairy products

[0034] The reagents used in this example are acetonitrile (chromatographically pure, Fisher Scientific), formic acid (chromatographically pure, SIGMA-ALDRICH), ammonium acetate (chromatographically pure, SIGMA-ALDRICH), n-hexane (chromatographically pure, Dima Company), glacial acetic acid (chromatographically pure, Tianjin Kemiou Chemical Reagent Co., Ltd.), magnesium sulfate, sodium chloride, anhydrous sodium acetate, anhydrous magnesium sulfate, anhydrous sodium sulfate (burn at 650°C for 4 h and store in a desiccator for later use): Analytical grade, Tianjin Yongda Chemical Reagent Co., Ltd. PSA (Primarysecondary amine N-propylethylenediamine) filler, particle size 40-60 μm; C18 (octadecylsilane bonded phase), particle size 40-60 μm.

[0035] Pesticide standard products are carbendazim, diquat dibromide, spinosad, diflubenzuron, dinotefuran, emamectin benzoate, sulfoxaflor, prot...

Embodiment 2-5

[0069] Example 2-5 A method for detecting the content of residual pesticides in dairy products

[0070] Examples 2-5 are respectively a method for detecting the residual pesticide content in dairy products. The detection method is the same as that of Example 1, except that the parameters in the process of configuring and measuring the sample liquid D to be tested are different. See the table for details. 6:

[0071] Table 6 List of parameters

[0072]

[0073] Measured according to the steps and conditions in the above table, the results are as follows,

[0074] The measurement result of embodiment 2:

[0075] (1) Qualitative measurement results:

[0076] Measured according to the method of Example 1, by comparing the retention times of various pesticides in the sample and the standard, they are basically the same, with a deviation of ≤ 2.5%, and the maximum allowable deviation of the relative ion abundance during qualitative confirmation meets the requirements.

[0077...

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Abstract

The present invention discloses a method for detecting residual pesticide content in a dairy product. The method comprises the following steps performed one by one: extracting a residual pesticide inthe dairy product by using a glacial acetic acid-acetonitrile solution, adding anhydrous sodium acetate and sodium chloride in an extraction process, and performing vibration, ultrasound processing, phase separation and filtering; then performing absorbent refining by using SPA, C18 and anhydrous magnesium sulfate, and performing vibration, centrifugation and phase separation to obtain a to-be-tested sample solution; and detecting the to-be-tested sample solution. According to the method, an adsorbent is changed, a strong interfering substance is removed from the dairy product, and adsorptionof the residual pesticide is reduced, so that a simple method can be used to remove impurities from the dairy product and reduce a loss of a target object (residual pesticide). The method is convenient to operate, efficient, and is relatively high in recovery rate. In addition, a washing process is added, so that a recovery rate of the residual pesticide is increased while impurities are removed in a better manner.

Description

technical field [0001] The invention belongs to the field of food testing, and relates to dairy product testing, in particular to a method for detecting residual pesticide content in dairy products. Background technique [0002] With the improvement of residents' living standards, people pay more attention to food safety, especially when consuming dairy products. In order to ensure the quality and safety of dairy products, the country continues to increase the types of pesticide residue detection in milk, such as the release and implementation of GB / T 2763.1-2018, and the corresponding detection technology and requirements are also continuously improved. At present, gas chromatography is used to analyze pesticide residues as an important analysis method in chromatography, but the detection method of gas chromatography has the problems of complicated pretreatment operation, high consumption of organic solvent, long detection time, many impurities on the machine and low recove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/14B01D15/20
CPCG01N30/02G01N30/14B01D15/20G01N2030/146G01N2030/047
Inventor 齐晓茹苏运聪李飞李兴佳张耀广柴艳兵白晓云王瑶
Owner JUNLEBAO DAIRY GRP CO LTD
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