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Method for rapid detecting sodium sulfoxylate formaldehyde in foodstuff

A detection method and a technology of hanging white lumps, which are applied in the field of food hygiene testing, can solve the problems of difficult to realize rapid on-site detection of hanging white lumps in food, difficulties in realizing rapid on-site detection of "hanging white lumps", and inaccurate detection results of "hanging white lumps". Accuracy and other issues, to achieve reliable detection results, overcome cumbersome and time-consuming operations, and avoid mutual interference

Inactive Publication Date: 2006-02-22
重庆工学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sample of this detection method also needs to be re-tested after distillation and absorption.
[0006] To sum up, the main problems existing in the existing technology are: (1) When used for the detection of "hanging white lumps" in food, due to the existence of the background value, misjudgment is easy to occur and the accuracy is not high; (2) there is no correct understanding In addition to formaldehyde and sodium bisulfite, the residues of "hanging white lumps" in food also have some low-priced sulfides, resulting in inaccurate test results for many "hanging white lumps"; (3) due to food components and forms It is relatively complicated, and the traditional "hanging white lump" detection method has obvious limitations; (4) it is difficult to realize the on-site rapid detection of "hanging white lump" in food

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Buy tofu at the farmer's market, use the technology of the present invention - "fading method" to quickly detect the hanging white lumps on the spot, the reagents carried are prepared in advance, just mash the tofu, filter, and separate them in two colorimetric tubes Add 10 drops of iodine-starch solution, add the sample to be tested (about 2 to 10 drops) into one of the colorimetric tubes, add an equal volume of distilled water to the other colorimetric tube as a blank, and the blue in the sample tube fades, indicating that there is sulfurous acid Sodium hydrogen exists;

[0025] At the same time, the pH value of the filtrate was adjusted to 7.0 by adopting the rapid on-site detection method of formaldehyde, and then successively added 1 drop of sodium sulfite, thyme phenolphthalein and sample test solution into the colorimetric tube, and the colorimetric tube turned blue after 5 seconds. The concentration of formaldehyde in the filtrate should be greater than 5ppm, an...

Embodiment 2

[0027] When buying steamed buns at the farmer’s market, use the technology of the present invention—"turbidity method" to quickly detect the hanging white lumps on the spot. Take 0.5mL of hydrogen peroxide and 2mL of barium chloride in a 10mL colorimetric tube, shake well, then add 5mL of the sample to be tested, observe the turbidity of the solution, compare it with the turbidity gradient, and do a blank test at the same time, steamed bread The content of low-valent sulfides in the samples ranged from 200-300ppm, indicating that the steamed buns were added with diaobaikuai.

Embodiment 3

[0029] Buy a vermicelli from a supermarket, use the technology of the present invention - "fading method" to quickly detect the hanging white blocks on the spot, the reagents carried are prepared in advance, take the chopped vermicelli, soak, filter, and separate them in two colorimetric tubes Add 10 drops of iodine-starch solution, add the sample to be tested (about 2 to 10 drops) into one of the colorimetric tubes, and add an equal volume of distilled water to the other colorimetric tube as a blank, and the blue in the sample tube does not fade, indicating that the vermicelli There is no hanging white block in it.

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Abstract

This invention relates to one rapid test method of sodium sulfoxylate formaldehyde in food, which comprises the following steps: a, preparing sample and smashing the food to be tested for dipping and filtering for use; b, formaldehyde testing and using the reaction between the formaldehyde and sodium sulfite to generate OH- and according to the characteristics of product, judging by the color developing method of thymol phthalein and semi-determining the content by electrometric method; c, sodium acid sulfite testing: using amidon as indicator and generating Na2SO4 and I- to turning the solution from blue to none to judge whether there is NaHSO3.

Description

[0001] Field [0002] The invention relates to a method for rapidly detecting whether there are scallops in food, and a method capable of qualitatively and semi-quantitatively quickly detecting the presence of scallops in food, and belongs to the technical field of food sanitation detection. Background technique [0003] The chemical name of "hanging white block" is sodium formaldehyde sulfoxylate (Sodium formaldehydesulfoxylate), and the molecular formula is NaHSO 2 ·CH 2 O·2H 2 O, in the form of white block or crystalline powder, soluble in water, relatively stable at room temperature; its strong reducibility makes it have a bleaching effect; it decomposes when it encounters acid, and the aqueous solution begins to decompose above 60 °C, and the higher temperature It decomposes into toxic gases such as formaldehyde, sulfur dioxide and hydrogen sulfide, which can cause headaches, fatigue, poor appetite, and even nasopharyngeal cancer in severe cases. The International Orga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N27/60G01N21/82G01N1/28
Inventor 张晓凤徐铭熙柳亚珍付钰洁鲁秀敏项锦欣
Owner 重庆工学院
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