Reagent and method for rapidly detecting formaldehyde in foods

A technology for detection reagents and test strips, which is used in material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc. problem, to achieve the effect of fast fading response, guaranteed accuracy, guaranteed accuracy and sensitivity

Inactive Publication Date: 2014-03-05
广东中测食品化妆品安全评价中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are many methods for the determination of formaldehyde, such as spectrophotometry, gas chromatography, liquid chromatography, polarography, etc., but these methods have certain limitations, such as spectrophotometry, although it has the advantages of easy op

Method used

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Examples

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Example Embodiment

[0024] Example 1

[0025] A rapid detection reagent for formaldehyde in food, which is characterized by comprising a phloroglucinol solution, a sodium hydroxide solution, and a formaldehyde standard solution.

[0026] The concentration of the phloroglucinol solution is 0.005 mol / L and the volume is 8 ml.

[0027] The concentration of the sodium hydroxide solution is 2mol / L and the volume is 5ml.

[0028] The concentration of the formaldehyde standard solution is 10ug / ml and the volume is 2ml.

[0029] The method for detecting formaldehyde in food using the above reagents includes the following steps:

[0030] (1) Use protein precipitation method to pretreat the sample to prepare the sample solution to be tested. The specific protein precipitation method is as follows: first weigh 2g of sample, mix it with purified water in a ratio of 1:1, and stir it with a mixer. Homogenize, put in a beaker, add 20ml purified water, adjust the pH of the solution to 5-9, add 5ml of zinc sulfate reagent,...

Example Embodiment

[0033] Example 2

[0034] A rapid detection reagent for formaldehyde in food, which is characterized by comprising a phloroglucinol solution, a sodium hydroxide solution, and a formaldehyde standard solution.

[0035] The concentration of the phloroglucinol solution is 0.01 mol / L and the volume is 15 ml.

[0036] The concentration of the sodium hydroxide solution is 5 mol / L and the volume is 10 ml.

[0037] The concentration of the formaldehyde standard solution is 20ug / ml and the volume is 5ml.

[0038] The method for detecting formaldehyde in food using the above reagents includes the following steps:

[0039] (1) The sample is pretreated by protein precipitation method to prepare the sample solution to be tested. The specific protein precipitation method is as follows: first weigh 5g of sample, mix it with purified water in a ratio of 1:1, and stir it with a mixer. Homogenize, put in a beaker, add 50ml purified water, adjust the pH of the solution to 5-9, add 10ml of zinc sulfate rea...

Example Embodiment

[0042] Example 3

[0043] A rapid detection reagent for formaldehyde in food, which is characterized by comprising a phloroglucinol solution, a sodium hydroxide solution, and a formaldehyde standard solution.

[0044] The concentration of the phloroglucinol solution is 0.008 mol / L and the volume is 12 ml.

[0045] The concentration of the sodium hydroxide solution is 3.5 mol / L and the volume is 8 ml.

[0046] The concentration of the formaldehyde standard solution is 15ug / ml and the volume is 3.5ml.

[0047] The method for detecting formaldehyde in food using the above reagents includes the following steps:

[0048] (1) Use protein precipitation method to pretreat the sample to prepare the sample solution to be tested. The specific protein precipitation method is as follows: first weigh 3.5g sample, mix it with purified water in a ratio of 1:1, and stir it with a mixer. Make a homogenate, put it in a beaker, add 35ml purified water, adjust the pH of the solution to 5-9, add 8ml of zinc ...

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Abstract

The invention relates to a reagent and a method for rapidly detecting formaldehyde in foods. The reagent comprises a phloroglucinol solution, a sodium hydroxide solution and a formaldehyde standard solution. The detection method comprises the following steps: pretreating a sample, and preparing a sample solution to be detected; taking three colorimetric tubes, respectively adding the sample solution to be detected into one colorimetric tube, adding the formaldehyde standard solution into another colorimetric tube, and taking the rest colorimetric tube as a blank control group; adding the sodium hydroxide solution into the three colorimetric tubes, and adding the phloroglucinol solution into the three colorimetric tubes; finally, dripping the three solutions onto test paper, observing color changes of the three solutions on the test paper, comparing the color change of the sample solution to be detected with a color card, and performing qualitative and quantitative analysis on formaldehyde in the sample to be detected. The detection method is easy to operate, special equipment and instruments are not needed, the detection result is reliable, and the method has high sensitivity and is particularly suitable for rapid detection of the formaldehyde in the foods.

Description

technical field [0001] The invention belongs to the field of food safety detection, and in particular relates to a rapid detection reagent and detection method for formaldehyde in food. Background technique [0002] Formaldehyde is a toxic substance that can directly act on amino groups, sulfhydryl groups, hydroxyl groups and carboxyl groups to generate methine derivatives, thereby destroying body proteins and enzymes, causing irreversible coagulation and necrosis of tissue cells, and taking a small amount of formaldehyde can prevent stomach cancer. The digestion of enzymes and pancreatic enzymes affects metabolic functions, and can cause serious damage to important organs and systems such as the nervous system, liver, and lungs. The World Health Organization has identified it as a carcinogenic and teratogenic substance and a recognized Allergens. Formaldehyde is a protoplasmic poison with high toxicity. It ranks second on the list of toxic chemicals in my country. influenc...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 郭狄
Owner 广东中测食品化妆品安全评价中心有限公司
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