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Method for detecting heavy metal lead in fresh egg

A technology for heavy metals and fresh eggs, which is applied in the direction of analyzing materials through chemical reactions and observing the impact on chemical indicators, etc., can solve the problems of heavy metal lead detection and other problems, and achieve the purpose of solving the inconvenience of detection and improving The effect of detection efficiency

Active Publication Date: 2018-09-28
GUANGZHOU ANNUO FOOD SCI & TECH CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for detecting heavy metal lead in fresh eggs, aiming to solve the problem of inconvenient detection of heavy metal lead in fresh eggs by existing methods

Method used

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  • Method for detecting heavy metal lead in fresh egg

Examples

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Embodiment 1

[0046] (1) Take 1 whole fresh egg, break it and mix the egg white and egg yolk evenly;

[0047] (2) Measure 2ml of the above mixed sample and add it to a 10mL centrifuge tube;

[0048] (3) Add 2 mL of acetonitrile and 1 mL of 0.1 mol / L hydrochloric acid solution to the above centrifuge tube, shake and mix for 1 min, and centrifuge at 4000 r / min for 2 min.

[0049] (4) Add 150uL 1.3mol / L thiourea aqueous solution and 150uL 0.2mol / L lemon triamine aqueous solution to the above sample solution, shake gently and wait for 10~20S.

[0050] (5) Then add 50uL of 2 g / L xylenol orange solution, 50uL of 1.5g / L o-phenanthroline solution, 50uL of pH5.4 acetic acid-sodium acetate buffer solution, shake and mix well, wait for 10~20S Observe the phenomenon (observe the color change of the supernatant and the egg color change at the bottom of the centrifuge tube).

[0051] It has been determined that when the lead content in fresh eggs exceeds 0.2ppm, the denatured eggs at the bottom of the ...

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Abstract

The invention discloses a method for detecting heavy metal lead in a fresh egg. The method comprises the steps that egg liquid is obtained after egg white and egg yolk of the to-be-detected fresh eggare mixed uniformly; an organic solvent and hydrochloric acid are added in the egg liquid in sequence, and uniform mixing and centrifugation are conducted to obtain layered liquid, wherein the bottompart is a denaturation egg, and the upper part is clear liquid; an anti-interference reagent is added into the layered liquid, a xylenol orange solution, a phenanthroline solution and a buffer solution are added after primary standing, and after secondary standing, the color of the bottom denaturation egg is observed; if the bottom denaturation egg is purple or purple red, it is shown that the to-be-detected fresh egg contains heavy metal lead. The method solves the problem that it is inconvenient to detect the heavy metal lead in the fresh egg by means of an existing method.

Description

technical field [0001] The invention relates to the technical field of food detection, in particular to a method for detecting heavy metal lead in fresh eggs. Background technique [0002] For a long time, heavy metal pollution has been one of the main reasons affecting the quality and safety of China's food, seriously restricting China's ability to earn foreign exchange from food exports. Among them, Pb is one of the heavy metal elements that pollute the environment and endanger the growth of organisms. It comes from a wide range of sources, mainly from waste, wastewater, garbage, and automobile exhaust. Lead compounds are highly toxic to moderately toxic. Pb is very harmful to the human body and can cause damage to the nervous system, digestive system, immune system, hematopoietic system, and reproductive system. The results of the risk assessment of Pb by the National Codex Alimentarius Commission (CAC) show that the maximum permissible weekly intake (PTWI) of the human ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 毓志超吕丽珊钟汉高杨鹏博杨松林
Owner GUANGZHOU ANNUO FOOD SCI & TECH CO LTD
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