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Preparation method of molecularly-imprinted electrochemical transducer for detecting propylgallate as well as application thereof

A technology of propyl gallate and molecular imprinting, applied in the direction of electrochemical variables of materials, etc., can solve the problems of complicated instrument operation, high detection cost, long detection time, etc., and achieve the effects of simple operation, high sensitivity and fast detection speed.

Inactive Publication Date: 2014-02-12
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These detection methods have the disadvantages of high detection cost, long detection time, complicated instrument operation, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for preparing a molecularly imprinted electrochemical sensor for detecting propyl gallate (PG), the steps are as follows:

[0025] (1) Drop 6 μl of PtAu-GrCNTs composite homogeneous solution on the surface of glassy carbon working electrode, and dry overnight at room temperature;

[0026] (2) Polymerize the molecularly imprinted polymer on the surface of (1) electrode by means of electropolymerization, the voltage range is 0.35 V~0.85 V, the sweep rate is 0.05 V / S, electropolymerization is performed for 10 cycles, and it is dried overnight at room temperature;

[0027] (3) Use 0.1 mol / L hydrochloric acid solution to elute the template molecule (PG) on the surface of the sensor, and dry it overnight at room temperature;

[0028] (4) Using Ag / AgCL as the reference electrode, using the Pt electrode as the counter electrode, and using the electrode obtained in (3) after the sensor is combined with the template molecule as the working electrode, connect to the elect...

Embodiment 2

[0030] A method for preparing a molecularly imprinted electrochemical sensor for detecting propyl gallate (PG), the steps are as follows:

[0031] (1) Drop 6 μl of PtAu-GrCNTs composite homogeneous solution on the surface of glassy carbon working electrode, and dry overnight at room temperature;

[0032] (2) The molecularly imprinted polymer was polymerized on the surface of (1) electrode by electropolymerization, the voltage range was 0.35 V~0.85 V, the scan rate was 0.05 V / S, electropolymerization was performed for 15 cycles, and room temperature was dried overnight;

[0033] (3) Use 0.1 mol / L hydrochloric acid solution to elute the template molecule (PG) on the surface of the sensor, and dry it overnight at room temperature;

[0034] (4) Using Ag / AgCL as the reference electrode, using the Pt electrode as the counter electrode, and using the electrode obtained in (3) after the sensor is combined with the template molecule as the working electrode, connect to the electrochemi...

Embodiment 3

[0036] A method for preparing a molecularly imprinted electrochemical sensor for detecting propyl gallate (PG), the steps are as follows:

[0037] (1) Drop 6 μl of PtAu-GrCNTs composite homogeneous solution on the surface of glassy carbon working electrode, and dry overnight at room temperature;

[0038] (2) The molecularly imprinted polymer was polymerized on the surface of (1) electrode by electropolymerization, the voltage range was 0.35 V~0.85 V, the sweep rate was 0.05 V / S, electropolymerization was performed for 20 cycles, and room temperature was dried overnight;

[0039] (3) Use 0.1 mol / L hydrochloric acid solution to elute the template molecule (PG) on the surface of the sensor, and dry it overnight at room temperature;

[0040] (4) Use Ag / AgCL as the reference electrode, use the Pt electrode as the counter electrode, and use the electrode obtained in (3) after the sensor is combined with the template molecule as the working electrode, connect to the electrochemical w...

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Abstract

The invention provides a molecularly-imprinted electrochemical transducer for detecting propylgallate (PG). The molecularly-imprinted electrochemical transducer utilizes an electrode surface modifying technology to modify platinum double nanoparticle-graphene carbon nano tube composite (PtAu-GrCNTs) to the surface of the electrode; then, a molecularly-imprinted polymer is connected to the surface of a PtAu-CrCNTs-modified electrode by adopting an electric polymerization way; and the molecularly-imprinted electrochemical transducer is formed after template molecules (PG) are eluted. After the template molecules are eluted, a series of holes matched with the template molecules are formed on the surface of the sensor, and when the eluted sensor is soaked in sample liquor containing the template molecules, the template molecules are specifically adsorbed on the surface of the sensor. The successfully prepared electrochemical transducer is connected to an electrochemical working station as a working electrode; electrochemical signals change due to special adsorption of the template molecules, and the detection for the propylgallate (PG) can be realized by utilizing changes of the electrochemical signals. The molecularly-imprinted electrochemical transducer prepared by the preparation method disclosed by the invention is strong in selectivity, high in sensitivity, simple and quick to operate, and suitable for detecting the propylgallate (PG) in food.

Description

technical field [0001] The invention belongs to the field of detection of nanometer materials and food additives, and provides a molecularly imprinted electrochemical sensor for detecting propyl gallate, which can be used for the detection of propyl gallate in food. Background technique [0002] Propyl gallate (PG), aliased in Chinese as "propyl bis acid", is a synthetic phenolic antioxidant, which is a kind of food additive and is widely used in various edible oils, meat and other foods. Excessive consumption of propyl gallate (PG) will cause harm to human health, so many countries have imposed restrictions on the content of propyl gallate (PG) added to food. Therefore, we should establish a simple , Rapid, accurate and sensitive method for detecting propyl gallate (PG). The currently reported detection methods of propyl gallate (PG) mainly include high performance liquid chromatography, gas chromatography and so on. These detection methods have the disadvantages of high ...

Claims

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Application Information

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IPC IPC(8): G01N27/30
Inventor 黄加栋崔敏刘素
Owner UNIV OF JINAN
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