A method for detecting dieldrin residues in dairy products

A detection method, the technology of dieldrin, applied in the field of detection of dieldrin residues in dairy products, can solve the problems of insufficient precision of dieldrin residues, troubles in food safety, and low pertinence of dieldrin, etc. Achieve the effects of improving detection accuracy, wide application range, and stable data results

Active Publication Date: 2016-04-06
BEIJING SANYUAN FOOD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0002] Dieldrin, the molecular formula is C 12 h 8 Cl 6 O (hexachloro-epoxy octahydro-xylene naphthalene), as a high-efficiency organochlorine pesticide, is commonly used in countries all over the world, but because it is an environmental hormone pollutant, it has toxic and harmful substances that interfere with the endocrine of humans and other animals , its residue problem has been perplexing food safety and threatening people's health
[0005] However, the detection method provided by the prior art is only for raw milk, which is suitable for a single object; and detects up to 19 kinds of organochlorine pesticides at the same time, which is not very specific to dieldrin. This method is used to detect dieldrin residues in dairy products is not accurate enough

Method used

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  • A method for detecting dieldrin residues in dairy products
  • A method for detecting dieldrin residues in dairy products
  • A method for detecting dieldrin residues in dairy products

Examples

Experimental program
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Embodiment

[0047] Embodiment: the detection of dieldrin residue

[0048] Detection of dieldrin residues in various dairy products; the specific steps are as follows:

[0049] 1. Preparation of the mixed standard working solution of the reference substance: use n-hexane as the dilution solvent to prepare 5 concentrations of the mixed standard working solution of the reference substance of dieldrin.

[0050] The specific preparation method is as follows:

[0051] (1) Mixed standard stock solution: pipette 100 μL of dieldrin standard solution into a 10 mL volumetric flask, dilute to volume with n-hexane to obtain 1 mg / L dieldrin standard stock solution;

[0052] (2) Mixed standard working solution:

[0053] Referring to the above preparation method, prepare 5 μg / L, 10 μg / L, 20 μg / L, 40 μg / L, 50 μg / L dieldrin standard working solutions.

[0054] 2. Sample extraction: Weigh 10g of dairy product sample, accurate to 0.001g, into a 50mL centrifuge tube, add 1mL of isopropanol, 15mL of n-hexan...

experiment example

[0100] Using the methods provided in the examples and comparative examples, the residual amount of dieldrin in pasteurized milk, fermented milk, modulated milk, sterilized milk, milk beverage and milk slurry was compared and verified by 20 μg / L standard addition, and the judgment and detection accuracy and reliability of the method.

[0101] The verification method is specifically as follows: respectively weigh 10.00 g of the sample to be tested and add 200 μL of 1 mg / L dieldrin standard stock solution to obtain a spiked sample with a concentration of 20 μg / L; respectively adopt the methods provided in the comparative example and the embodiment of the present invention , to detect the dieldrin residues in the spiked samples prepared from different kinds of dairy products, each sample was measured 6 times, the recovery rate was calculated according to the measured amount and the spiked amount, and the coefficient of variation and detection limit were obtained; Table 3 shows the...

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Abstract

The invention discloses a method for detecting residual quantity of Dieldrin in dairy products. The method is capable of detecting the residual quantity of Dieldrin with pertinence and comprises the following steps: mixing three organic solvents comprising isopropanol, acetone and normal hexane according to a special volume ratio, extracting, purifying and concentrating the Dieldrin in the dairy products, carrying out gas chromatography determination under the specified conditions and calculating the residual quantity of the Dieldrin in samples according to a standard working curve. The method is simple to operate, low in influence on target objects, stable in data result and high in accuracy; the system reproducibility and applicability reaches the standard; the method can meet the requirements for detecting the residual quantity of the Dieldrin in the milk and the milk products, is wide in application range and is applied to the detection of the residual quantity of a plurality of Dieldrins in pasteurized milk, fermented milk, modified milk, sterilized milk, milk beverages and milk sauce.

Description

technical field [0001] The invention relates to the technical field of trace analysis, in particular to a method for detecting residual dieldrin in dairy products. Background technique [0002] Dieldrin, the molecular formula is C 12 h 8 Cl 6 O (hexachloro-epoxy octahydro-xylene naphthalene), as a high-efficiency organochlorine pesticide, is commonly used in countries all over the world, but because it is an environmental hormone pollutant, it has toxic and harmful substances that interfere with the endocrine of humans and other animals , its residual problem has been perplexing food safety and threatening people's health. Japan has banned the use of dieldrin, my country has also banned the production and use of dieldrin, and requires testing of imported and exported products. [0003] At present, the detection of dieldrin in dairy products is mainly carried out according to the provisions of GB / T5009.1622008 "Determination of Multi-component Residues of Organochlorine P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/88
Inventor 于超徐晨白素琴李萍陈历俊
Owner BEIJING SANYUAN FOOD
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