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Method for measuring residual erythromycin in environment by using hydrophilic ionic-liquid aqueous two-phase system

A technology of ionic liquid and two-phase water, which is applied in the preparation of test samples, test food, material inspection products, etc., can solve the problems of poor accuracy, low sensitivity, single selection range, etc., achieve small standard deviation, simple operation, Effects with a wide linear range

Inactive Publication Date: 2010-09-15
CHANGAN UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the shortcomings of low sensitivity, single selection range and poor accuracy existing in the existing residual erythromycin detection method, the object of the present invention is to provide a hydrophilic ionic liquid two-phase system for the determination of residual erythromycin in the environment The method, which can improve the accuracy of the determination of residual erythromycin, and at the same time has the advantages of simple operation, without using large instruments, and reducing the secondary pollution caused by the use of organic volatile solvents

Method used

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  • Method for measuring residual erythromycin in environment by using hydrophilic ionic-liquid aqueous two-phase system
  • Method for measuring residual erythromycin in environment by using hydrophilic ionic-liquid aqueous two-phase system
  • Method for measuring residual erythromycin in environment by using hydrophilic ionic-liquid aqueous two-phase system

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Embodiment 1

[0032] Take 1.5g of 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid, put it in a 60ml Erlenmeyer flask, add 3ml of erythromycin standard solution and 25.0ml of distilled water, add 11g of NaH 2 PO 4 , mix well. Shake and extract in a constant temperature oscillator for 2 hours at 25°C and then stand still. After the phase separation is clear, measure the concentration of the remaining erythromycin in the water phase, and calculate the extraction rate of erythromycin from the content of erythromycin in the water phase before and after extraction. .

Embodiment 2

[0034] Take 1.5g of 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid, put it in a 60ml conical flask with a stopper, add 3ml of erythromycin standard solution and 25.0ml of distilled water, add 11g of NaH 2 PO 4 , mix well. Shake and extract in a constant temperature oscillator for 2 hours at 25°C and then stand still. After the phase separation is clear, measure the concentration of the remaining erythromycin in the water phase, and calculate the extraction rate of erythromycin from the content of erythromycin in the water phase before and after extraction. .

Embodiment 3

[0036] Take 2.5g of 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid, put it in a 60ml Erlenmeyer flask, add 3ml of erythromycin standard solution and 25.0ml of distilled water, add 11g of NaH 2 PO 4 , mix well. Shake and extract in a constant temperature oscillator at 25°C for 1.5h and then stand still until the phase separation is clear. The concentration of remaining erythromycin in the water phase was measured, and the extraction rate of erythromycin was calculated from the content of erythromycin in the water phase before and after extraction.

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Abstract

The invention discloses a method for measuring residual erythromycin in an environment by using a hydrophilic ionic-liquid aqueous two-phase system. The method comprises the following steps of: forming the ionic-liquid aqueous two-phase system by using 1.5 grams of 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4) and 11 grams of NaH2PO4, at least extracting the solution for 2 hours once by using the extracting system, standing the solution after extraction, measuring the concentration of the residual erythromycin in the water phase after the split phases are clear, and calculating the extraction rate of the erythromycin by using the erythromycin content of the water phase before and after the extraction. According to the method, the extraction rate of the erythromycin can reach 99.31 percent. The method has the characteristics of wide linear range, low detection limit, small relative standard deviation and high measuring yield of a sample. The method can meet the national detection requirement for the residual erythromycin, is simpler to operate, and is suitable for quantitative analysis of residual trace erythromycin in food.

Description

technical field [0001] The invention relates to the environmental protection technical field of environmental engineering and analytical chemistry, and relates to a method for determining residual erythromycin in the environment with a hydrophilic ionic liquid two-water phase system. The method is easy to operate and has high accuracy. Background technique [0002] The problems exposed in food safety have been paid more and more attention by people. Vicious food safety incidents at home and abroad continue to occur, not only bringing huge losses to people's lives and property, but also causing extremely bad social impacts. Whether it is the continuous occurrence of food safety vicious incidents such as dioxin, mad cow disease, and Escherichia coli all over the world. There are also frequent food safety incidents in our country, such as adding melamine to milk powder, dyeing food with carcinogen Sudan Red, and selling rice contaminated by aflatoxin; no matter in developed co...

Claims

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Application Information

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IPC IPC(8): G01N33/02G01N1/34
Inventor 李宇亮关卫省
Owner CHANGAN UNIV
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