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Quick detection method for formol in food

A detection method, formaldehyde technology, applied in the direction of material analysis through observation of the influence of chemical indicators, analysis through chemical reaction of materials, analysis using chemical indicators, etc., can solve the problem of expensive reagents and interference in final colorimetry , air oxidation and other issues, to achieve the effect of reducing reagent pollution, reducing experimental workload, and reducing costs

Inactive Publication Date: 2006-03-01
HUBEI ENTRY EXIT INSPECTION & QUARANTINE BUREAUOF THE PEOPLES REPUBLIC OF CHINA
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the liquid chromatography method utilizes large-scale instrument analysis, which is not suitable for on-site testing; the sample liquid of the phloroglucinol method and the acetylacetone method interferes with the final colorimetry; the reagents in the phenol reagent method are expensive and not easy to store for a long time
The above methods all require a low-concentration formaldehyde standard solution, and the low-concentration formaldehyde standard solution will be oxidized by air if it is left for several weeks

Method used

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  • Quick detection method for formol in food
  • Quick detection method for formol in food
  • Quick detection method for formol in food

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0015] Three mushroom samples from Zhongxing, Shangang, and Yuyuan were taken and analyzed and tested according to the following operating procedures.

[0016] Soak 10g sample in 200ml water for 20min, and dissolve the free formaldehyde in the sample mushroom in the water phase.

[0017] Take 2ml of the sample solution in a 10ml colorimetric tube, add 1ml of phenylhydrazine hydrochloride solution, shake well and let stand for 20min, add 1ml potassium ferricyanide solution, shake well and stand for 4min, add 2.5ml hydrochloric acid solution, dilute with water to 10ml, shake Evenly, with the side of the colorimetric tube and Figure 1 to Figure 3 The standard chromatographic plate is compared, and the result is compared with the analysis result of liquid chromatography as follows:

[0018] Comparison of the results of detecting formaldehyde content in shiitake mushrooms by two methods (unit: mg / kg):

[0019] Liquid chromatography of the present invention

[0020] ZTE: greater than 66...

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Abstract

This invention relates to a method for quickly testing methanol in foods which is characterized by dissolving methanol into water, adding chemical reagent to compare the generated colorful subject with standard chromatographic panel of known concentration after constant volume to know content sphere of methanol in the sample. The said standard chromatographic panel with known concentration is to add the chemical reagent with the same step as the above mentioned operation procedures into the prepared standard methanol solutions of different concentrations and process rather accurate standard chromatographic panel with full digital computer printing technology after constant volume.

Description

Technical field [0001] The invention relates to a method for detecting formaldehyde content, in particular to a method for quickly detecting formaldehyde in mushrooms. technical background [0002] Formaldehyde (English name: Formaldehyde; Molecular formula: CH 2 O; commonly known as: formalin) being added to food can extend the shelf life of food, prevent food deterioration, and play a role in disinfection and sterilization. However, the residual formaldehyde in food can seriously harm human health. Excessive intake of the human body can cause nausea, asthma, and pulmonary edema. Long-term exposure can cause chronic respiratory diseases, liver function, chromosomal abnormalities, children's physical decline, nervous system damage and other conditions, and even death can be serious. [0003] Now countries all over the world attach great importance to the content of formaldehyde in food, and many countries have promulgated regulations on the limit of formaldehyde residues. For exa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78G01N31/22
Inventor 王帆胡小钟王勇朱传才
Owner HUBEI ENTRY EXIT INSPECTION & QUARANTINE BUREAUOF THE PEOPLES REPUBLIC OF CHINA