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Method for measuring sulfur dioxide content in food

A technology of sulfur dioxide and sulfur dioxide solution, which is applied in the direction of chemiluminescence/bioluminescence, and analysis by making materials undergo chemical reactions, which can solve the problems of time-consuming, expensive equipment, complicated operation, etc., and overcome the cumbersome measurement operation and expensive equipment Manipulate complex effects

Inactive Publication Date: 2012-07-18
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is time-consuming, and it takes more than an hour for a sample to be measured once.
[0006] In addition, the disadvantages of the ion chromatography method are that the equipment is expensive and the operation is complicated. The disadvantages of the general chemiluminescence method are that flow injection equipment and strong oxidants are required.
There are also some rapid detection methods, most of which are qualitative and semi-quantitative methods, which can only be used as a reference for preliminary judgment

Method used

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  • Method for measuring sulfur dioxide content in food
  • Method for measuring sulfur dioxide content in food
  • Method for measuring sulfur dioxide content in food

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Determination of the content of sulfur dioxide in vermicelli, the steps are:

[0032] 1. Preparation of reagents

[0033] Luminol solution: use NaOH solution with a pH value of 12.5 to prepare a 0.02mol / L luminol solution, and store it in a refrigerator at 4°C, protected from light;

[0034] Sodium tetrachloromercury absorption solution: 13.6g of high mercury chloride and 6.0g of sodium chloride were dissolved in water and diluted to 1000mL, left overnight, filtered and set aside;

[0035] Sulfur dioxide standard solution: Dissolve sodium bisulfite in the sodium tetrachloromercury absorption solution, configure it into a 0.01mol / L sulfur dioxide solution, leave it overnight, filter the supernatant liquid with quantitative filter paper, and use the iodometric method to accurately calibrate its concentration. Dilute the sulfur dioxide solution with sodium tetrachloromercury absorption solution to 2mg / L sulfur dioxide standard solution;

[0036] Cobalt sulfate solution: ...

Embodiment 2

[0048] Determination of the content of sulfur dioxide in white fungus, the steps are:

[0049] Weigh 5.982g of evenly pulverized white fungus sample, sample treatment and other operations are the same as in Example 1, inject 200 μL of sample solution from the top injection hole of the luminescence instrument with a micro-syringe, and detect that the luminescence signal ΔI is 7031, and the regression equation is as follows:

[0050] ΔI=4839182.1A+14.9, the calculated A is 1.45×10 -3 mg;

[0051] Calculate the amount of sulfur dioxide in the sample:

[0052] X = A × 1000 m × V / ( 100 × 1000 ) = 1.45 × 10 - ...

Embodiment 3

[0055] Determination of sulfur dioxide content in biscuits, the steps are:

[0056] Weigh 7.862g of uniformly pulverized biscuit sample, sample treatment and other operations are the same as in Example 1, inject 200 μL of sample solution from the injection hole on the top of the luminescence instrument with a micro-syringe, and detect the luminescence signal ΔI as 7370, and the regression equation: ΔI=4839182.1A+ 14.9, calculate A as 1.52×10 -3 mg;

[0057] Calculate the amount of sulfur dioxide in the sample:

[0058] X = A × 1000 m × V / ( 100 × 1000 ) = 1.52 × 10 - 3 ...

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Abstract

The invention relates to a sulfur dioxide detecting method, in particular to a method for detecting sulfur dioxide content in food by utilizing the luminol chemiluminescence principle. In the method, luminol is taken as a lighting agent, oxygen in air is taken as an oxidizing agent, a sulphurous acid root is taken as a sensitizing agent, cobaltous sulfate is taken as a catalyst of a luminol-air-sulphurous acid root ion chemiluminescence system, and the concentration of the sulfite can be determined in a way that the change of the total lighting intensity of the system before and after sulfitesolution is determined, and the change is compared with that of the standard series, and furthermore, the sulfur dioxide content in the food can be determined. According to the method, the stability is good, the measuring result is reliable, the using amount of reagents is less, the convenience and the rapidness are achieved, and the cost is low. The method in the invention is adopted to accurately determine the residual amount of sulfur dioxide in dried fruits, dried vegetables, silk noodles and other food.

Description

technical field [0001] The invention relates to a method for detecting sulfur dioxide, in particular to a method for detecting the content of sulfur dioxide in food by using the principle of luminol chemiluminescence. Background technique [0002] As a food additive, sulfur dioxide is widely used in food bleaching, decolorization, anti-oxidation and anti-corrosion treatment to improve the appearance quality and extend the shelf life. Commonly used sulfur dioxide additives include sodium sulfite, sodium bisulfite, sodium hyposulfite and sodium pyrosulfite, etc. Sulfur is often used as a bleaching fumigant in food processing. After they interact with sugar, protein, pigment, enzyme, vitamin, aldehyde, ketone, etc. in food, they remain in food in the form of free and bound sulfur dioxide. [0003] Sulfur dioxide and its derivatives will have adverse effects on various systems, organs and tissues of the human body. Damage the bronchi and lungs, which in turn can induce various...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/76
Inventor 郭彦青耿红张月霞董川
Owner SHANXI UNIV
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