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Aqueous bi-phase system and application thereof to extraction of melamine from tomato ketchup

A two-phase system, melamine technology, applied in the fields of food science and analytical chemistry, can solve the problems of cumbersome operation, difficulty in popularization, low sensitivity, etc., and achieve the effects of convenient operation, overcoming easy emulsification, and sensitive detection

Inactive Publication Date: 2016-03-30
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the determination of existing melamine, its detection method has the disadvantages of low sensitivity, high cost, cumbersome operation and difficulty in popularization. The purpose of the present invention is to use a two-phase aqueous system and its separation of melamine in tomato paste. It can improve the accuracy of the determination of melamine in tomato paste, easy to operate, does not use large instruments, and reduces the use of traditional organic volatile solvents to avoid secondary pollution.

Method used

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  • Aqueous bi-phase system and application thereof to extraction of melamine from tomato ketchup
  • Aqueous bi-phase system and application thereof to extraction of melamine from tomato ketchup
  • Aqueous bi-phase system and application thereof to extraction of melamine from tomato ketchup

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Take 3.5g of 1-butyl-4-methylpyridine tetrafluoroborate and place it in a centrifuge tube, add 2.6g of sodium dihydrogen phosphate and 3.9g of distilled water, mix well, then add 2g of the melamine solution to be tested, and heat at 35°C , shake at a constant temperature for 30 minutes at pH 4.2, separate the phases and let stand for extraction for 24 hours. After the phase separation is clear, measure the concentration of residual melamine in the water phase, and calculate the extraction rate of melamine from the content of melamine in the water phase before and after extraction to be 98.6%.

[0050] Implementation column 2

[0051] The preparation method of this example is the same as that of Example 1, except that the ionic liquid of the organic matter is different. In this example, the organic matter is ethanol, and the other conditions remain unchanged.

[0052] In order to detect the extraction effect of the present invention on melamine, an extraction experiment...

Embodiment 7

[0066] The preparation method of this example is the same as that of Example 1, except that the amount of ionic liquid is different. In this example, 2.0 g of 1-butyl-4-picoline tetrafluoroborate is used, and other conditions remain unchanged.

[0067] In order to detect the extraction effect of the present invention on melamine, an extraction experiment was carried out on melamine, and the extraction rate was 79.7%.

[0068] Implementation Column 8

[0069] The preparation method of this example is the same as that of Example 1, except that the amount of ionic liquid is different. In this example, 5.5 g of 1-butyl-4-picoline tetrafluoroborate is used, and other conditions remain unchanged.

[0070] In order to detect the extraction effect of the present invention on melamine, an extraction experiment was carried out on melamine, and the extraction rate was 81.9%.

[0071] Implementation column 9

[0072] The preparation method of this example is the same as that of Example ...

Embodiment 10

[0075] The preparation method of this example is the same as that of Example 1, except that the pH value is different. The pH in this example is 8.0, and the other conditions remain unchanged.

[0076] In order to detect the extraction effect of the present invention on melamine, an extraction experiment is carried out on melamine, and the extraction rate is 66.9%.

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Abstract

The invention discloses an aqueous bi-phase system and application thereof to extraction of melamine from tomato ketchup. The aqueous bi-phase system comprises the following raw materials by mass: 35 to 40 percent of 1-butyl-4-picolinium tetrafluoroborate, 26 percent of sodium dihydrogen phosphate and the balance of distilled water, wherein the total percentage of the three ingredients is 100 percent. The application comprises the following steps: adding a melamine solution to be detected into the aqueous bi-phase system according to the mass ratio of 5 to 1; carrying out thermostatic oscillation for 30 minutes under the conditions that the temperature is 30 to 40 DEG C and the pH value is 4.2 to 4.4; carrying out phase separation; then carrying out still standing extraction for 24 hours. The extraction rate of melamine from tomato ketchup can reach up to 98.6 percent according to the application. The application has the advantages that the detection limit is low; the relative standard deviation is relatively low; not only can requirements of related food sanitation departments to melamine detection be met, but also the operation is simple, so as to be suitable for quantitative analysis of melamine from tomato ketchup.

Description

technical field [0001] The invention belongs to the technical fields of food science and analytical chemistry, and in particular relates to a two-phase aqueous system and its application for separating melamine from tomato paste. Background technique [0002] Melamine, commonly known as melamine and protein essence, is a widely used organic chemical intermediate product. It is the raw material for the production of melamine formaldehyde resin. It is widely used in the plastics and paint industries, and can also be used as fabric anti-wrinkle and anti-shrinkage treatment agents. Although melamine is an important industrial raw material, it is harmful to human and animal bodies and is not allowed to be used in food processing or food additives. Long-term consumption of foods containing melamine can lead to kidney stones, and even cause cancer and death; melamine also has a synergistic effect, and ingestion together with cyanuric acid can cause urinary system firmness and kidne...

Claims

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Application Information

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IPC IPC(8): G01N1/34
CPCG01N1/34
Inventor 李宇亮董婷婷徐一丹卢筱佳孙钰琨
Owner CHANGAN UNIV
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