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Method for electrochemically measuring content of hydroperoxides in emulsion

A hydroperoxide and electrochemical technology, applied in the direction of material electrochemical variables, can solve the problems of low accuracy, poor reproducibility, and long time consumption, and achieve the effect of fast measurement process, guaranteed accuracy, and high extraction efficiency

Inactive Publication Date: 2012-06-27
JIANGNAN UNIV
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Problems solved by technology

[0005] The current method for measuring the hydroperoxide content in the emulsion is not comprehensive, and there are many shortcomings in the reported research, such as the large amount of reagents in the iodometric method, and the titration end point is not easy to judge, resulting in low accuracy and poor reproducibility; The operation of the method is cumbersome and time-consuming (generally it takes 20 minutes to react), and the reagents used, such as chloroform, are toxic substances; the extraction efficiency of the extraction agent used to extract hydroperoxides in the emulsion is not high, which affects the accuracy of the measurement results
There are no relevant reports on the determination of hydroperoxide content in emulsion systems by chemically modified electrodes

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  • Method for electrochemically measuring content of hydroperoxides in emulsion
  • Method for electrochemically measuring content of hydroperoxides in emulsion
  • Method for electrochemically measuring content of hydroperoxides in emulsion

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Embodiment Construction

[0025] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0026]A method for electrochemically measuring the content of hydroperoxide in emulsion, the steps are as follows, (1) PVA solution with a concentration of 0.2% in an amount of 1 μL and ferrous iron with a concentration of 0.08mol / L in an amount of 1 μL Potassium cyanide solution was drip-coated on the surface of the pretreated glassy carbon electrode, dried and placed for later use; (2) 1mL of the emulsion to be tested was added to 5mL of the extraction solvent, which was petroleum ether with a volume ratio of 3:1 - isopropanol mixture, centrifuged to obtain the extract; (3) add the extract of step (2) to 20mL LiCl-ethanol supporting electrolyte solution with a conc...

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Abstract

The invention relates to a method for electrochemically measuring the content of hydroperoxides in emulsion. The method comprises the following steps of: (1), dropping and coating a potassium ferrocyanide solution and a PVA (Polyvinyl Alcohol) solution on the surface of a processed glassy carbon electrode, and drying and placing the glassy carbon electrode, for future use; (2), adding the emulsion to be detected into an extracting solvent to obtain an emulsion extract; and (3), diluting by adding the extract in the step (2) into a supporting electrolyte solution, adding a diluent into an electrolytic tank, inserting a three-electrode system that a working electrode is a modified electrode, a counter electrode is a platinum gauze electrode and a reference electrode is a saturated calomel electrode, and measuring the content of the hydroperoxides in the electrolytic tank by utilizing a square wave voltammetry. The method disclosed by the invention is used for preparing a highly sensitive modified electrode at first and then extracting the hydroperoxides in the emulsion effectively, thus, rapid and accurate measurement by using the electrochemical square wave voltammetry is realized.

Description

technical field [0001] The invention relates to a method for electrochemically measuring the content of hydroperoxide in emulsion, which belongs to the technical field of hydroperoxide detection in the field of analytical chemistry. Background technique [0002] In the daily chemical industry, lotions, face creams, etc. exist in the form of emulsions. During the storage of such cosmetics containing unsaturated fatty acids, due to the influence of external factors such as air, light, temperature, and metal ions, it is easy to produce Rancid. Oil rancidity includes hydrolytic rancidity, ketogenic rancidity (also called β-oxidative rancidity) and oxidative rancidity. Hydroperoxide is the initial oxidation product of oil, which is very unstable and easy to decompose, and it is easy to cause other free fatty acid molecules to quickly participate in the reaction in a chain reaction, which accelerates the rancidity of oil. Hydroperoxide itself has no peculiar smell, and when its ...

Claims

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Application Information

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IPC IPC(8): G01N27/26G01N27/48
Inventor 朱振中邵志芳陈莹
Owner JIANGNAN UNIV
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