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Detection method aiming at trace urea in white spirit

A technology for liquor and urea, applied in the field of liquor analysis and detection, to achieve the effects of good feasibility, high sensitivity and safety control

Inactive Publication Date: 2014-07-30
JIANGNAN UNIV
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Problems solved by technology

However, the quantitative method of urea in Chinese liquor has not been reported

Method used

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  • Detection method aiming at trace urea in white spirit
  • Detection method aiming at trace urea in white spirit
  • Detection method aiming at trace urea in white spirit

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Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: Quantification of urea in Luzhou-flavor liquor finished wine

[0024] (1) Reagent preparation: prepare a 200 mg / L urea standard stock solution with absolute ethanol as a solvent, store it in the dark at –4 °C, and have a validity period of 30 days. Prepare a 1.5 mol / L hydrochloric acid solution with experimental water. Derivatization reagent: prepare 0.02 mol / L 9-hydroxyanthranyl alcohol derivatization reagent with n-propanol as solvent, and store at –4 ℃ in the dark. Prepare a 1% acetic acid solution with experimental water. Mobile phase A: Prepare 0.02 mol / L sodium acetate solution with special water for experiments, then adjust the pH to 7.2 with 1% acetic acid solution, mix well and filter with a 0.45 μm water-based microporous membrane. Mobile phase B: acetonitrile solution, filtered through a 0.45 μm organic microporous membrane. The water used for the experiment was ultrapure water, which was boiled for 5-10 min and then cooled.

[0025] (2) Pre...

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Abstract

The invention provides a detection method aiming at trace urea in white spirit and belongs to the technical field of analysis and detection of the white spirit. The detection method comprises the following steps: carrying out derivation on the urea in the white spirit; determining the content of the urea in the white spirit by using a liquid chromatogram-fluorescence detection method, wherein a derivation reagent is 9-hydroxy xanthydrol (CAS: 90-46-0). The detection limit of the method provided by the invention can be reduced to 20.33 micrograms / liter; the linear relation detected in a urea concentration range of 25.98-6650 micrograms / liter is good; the linear correlation coefficient is 0.9991, the recovery rate is 94.6% and the relative standard deviation is 2.53%. The urea in the white spirit can be detected by using the method; the feasibility is good, the sensitivity is high and the accuracy is good; the detection method can be used for detecting the urea in finished-product white spirit and raw white spirit so as to control the safety of the white spirit very well.

Description

technical field [0001] The invention relates to a method for detecting trace amounts of urea in liquor, in particular to a method for derivatizing urea in liquor by using 9-hydroxyanthranyl alcohol, and then using liquid chromatography-fluorescence detection method to determine the content of urea in liquor The method for measuring belongs to the technical field of liquor analysis and detection. Background technique [0002] Studies have found that drinking wine contains carcinogenic chemical substance ethyl carbamate. According to reports, the formation of this substance during the fermentation process of liquor has a great relationship with the content of urea, that is, urea may chemically react with ethanol to generate amino ethyl formate. [0003] Therefore, in order to reduce the level of ethyl carbamate in liquor, controlling the content of urea in liquor is one of the key measures. And monitoring the content of urea in liquor has also become an important detection i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/88
Inventor 范文来徐岩张庄英
Owner JIANGNAN UNIV
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