Method for rapidly detecting sodium formaldehydesulfoxylate dihydrate in food

A fast and fast technology, which is applied in the preparation of test samples, measurement of color/spectral characteristics, material analysis by observing the influence of chemical indicators, etc., can solve the disadvantages of small business use and promotion, inconvenient portability Detection, high price of ion chromatograph and other problems, to achieve the effect of low detection limit

Inactive Publication Date: 2014-12-10
BEIJING ZHIYUNDA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the characteristics of high sensitivity, precision and accuracy, but the ion chromatograph is expensive and requires professional technicians to operate, which is not conducive to the use and promotion in small enterprises, and is not easy to carry and do rapid detection.

Method used

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  • Method for rapidly detecting sodium formaldehydesulfoxylate dihydrate in food
  • Method for rapidly detecting sodium formaldehydesulfoxylate dihydrate in food
  • Method for rapidly detecting sodium formaldehydesulfoxylate dihydrate in food

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1 measures the hanging white block content in vermicelli

[0050] (1) Sample processing

[0051]Weigh 2.5 g of the chopped vermicelli sample into a Erlenmeyer flask, add distilled water to 50 mL, ultrasonically extract for 5 min, filter, and use the filtrate for later use.

[0052] (2) Quantitative determination using a multifunctional food safety rapid detector

[0053] Take two 10mL colorimetric tubes (numbered as tube A and tube B with a marker pen), add 1mL of sample solution to each tube, drop 1 drop of solution D into tube A, shake well, wait for 1min, add 4 drops of solution A to the two tubes respectively and 4 drops of solution B, shake well, stand for 20min, shake 6 times during the period, then add 0.1mL of solution C, shake immediately for 30 seconds, let stand for 5min, add distilled water to the 5mL mark, shake well.

[0054] ① Open the detection software, select food quality analysis, find the item of hanging white block, put the cuvette cont...

Embodiment 2

[0060] Example 2 Determining the content of hanging white lumps in the bean curd stick sample

[0061] (1) Sample processing

[0062] Weigh 2.5 g of shredded bean curd stick samples into a conical flask, add distilled water to 50 mL, ultrasonically extract for 5 min, filter, and use the filtrate for later use.

[0063] (2) Quantitative determination using a multifunctional food safety rapid detector

[0064] Take two 10mL colorimetric tubes (numbered as tube A and tube B with a marker pen), add 1mL of sample solution to each tube, drop 1 drop of solution D into tube A, shake well, wait for 1min, add 4 drops of solution A to the two tubes respectively and 4 drops of solution B, shake well, stand for 20min, shake 6 times during the period, then add 0.1mL of solution C, shake immediately for 30 seconds, let stand for 5min, add distilled water to the 5mL mark, shake well.

[0065] ① Open the detection software, select food quality analysis, find the item of hanging white block, ...

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PUM

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Abstract

The invention provides a method for rapidly detecting sodium formaldehydesulfoxylate dihydrate in food, which is low in detection limit, accurate, rapid and convenient and can meet the requirements on field rapid detection and laboratory detection. The method comprises the following steps: (1) arranging equivalent samples in two sample tubes, firstly adding an appropriate amount of reagent D in one sample tube to transform sodium formaldehydesulfoxylate dihydrate in the sample of the tube into formaldehyde and retaining the equivalent sodium formaldehydesulfoxylate dihydrate contained in the sample in the other sample tube; (2) adding an appropriate amount of reagent A, reagent B and reagent C into the two sample tubes respectively to realize chromogenic reaction of the samples in the two sample tubes; (3) qualitatively determining whether the sample contains sodium formaldehydesulfoxylate dihydrate through the difference in color development of the samples in the two sample tubes, wherein the color of the sample in which sodium formaldehydesulfoxylate dihydrate is transformed into formaldehyde is deeper than that of the sample with equivalent untransformed sodium formaldehydesulfoxylate dihydrate; and (4) quantitatively determining the content of sodium formaldehydesulfoxylate dihydrate in the sample according to the measured absorbance value of the sample.

Description

technical field [0001] The invention belongs to the technical field of food safety detection, and in particular relates to a method for rapidly detecting hanging white lumps in food. Background technique [0002] Hanging white block, also known as Diaobai block, its chemical name is sodium formaldehyde sulfoxylate, and its molecular formula is NaHSO 2 ·CH 2 O·2HO 2 . Diaobaikuai is a translucent white crystal or small piece, easily soluble in water, and its aqueous solution is neutral. Sodium formaldehyde sulfoxylate is relatively stable at room temperature, and it is easy to decompose when encountering acid or high temperature. It is easy to decompose into formaldehyde and sulfur dioxide in aqueous solution, and decomposes faster as the temperature rises. Hanging white block has a strong reducing effect and has a bleaching effect. It is often used as a bleaching agent in industry, and is also used in synthetic rubber and vinyl compound polymers. It is an industrial che...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/78G01N1/28
Inventor 叶升锋严可以谢艳红桑华春
Owner BEIJING ZHIYUNDA TECH CO LTD
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