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Preparation and application of melamine molecular imprinting electrochemical sensor

A chemical sensor, melamine technology, applied in the direction of electrochemical variables of materials, etc.

Inactive Publication Date: 2011-01-12
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nitrogen protection during electropolymerization

Method used

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  • Preparation and application of melamine molecular imprinting electrochemical sensor
  • Preparation and application of melamine molecular imprinting electrochemical sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] Gold electrodes (diameter = 0.8 cm) in 0.3 μm Al 2 o 3 Sand on powder until a smooth mirror finish appears. dilute HNO 3 (volume ratio is 1:1), methanol, deionized water ultrasonic washing 5min. Take out the electrodes and set aside.

[0020] Equimolar resorcinol and o-aminophenol are functional monomers (resorcinol takes 0.0555g, o-aminophenol takes 0.0550g) is dissolved in 0.05moL / L perchloric acid, and the pH is adjusted with 0.10moL / L NaOH Value 5.5, add melamine 0.20g. Using cyclic voltammetry, the potential is -0.2 ~ 1.2V, and the balance time is 10 seconds to scan 30 circles, and the scanning speed is 50mv / s. The polymer film is deposited on the surface of the electrode, and ultrasonically eluted with methanol for 6 min. to remove the template molecules from the electrode to form a molecularly imprinted polymer film with holes in the template molecule configuration. Nitrogen protection during electropolymerization.

[0021] The actual liquid milk sample de...

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Abstract

The invention relates to a molecular imprinting electrochemical sensor, which is used for determining melamine in liquid milk and belongs to the technical field of food safety detection. The melamine in the liquid milk is taken as an object of study, and a molecularly imprinted polymer is prepared by electropolymerization on a gold electrode by using the cyclic voltammetry method. The invention constructs a new method for selectively detecting the melamine by taking mixed solution of equimolar hydroxyphenol and o-aminophenol as functional monomers, taking the melamine as template molecules and taking K3Fe(CN)6 as a probe between an imprinting electrode and base solution. The reaction conditions are respectively as follows: the monomer / template mass ratio is 0.55 / 1, the pH value is 5.5, and the temperature is 30 DEG C. The molecularly imprinted polymer imprinted polymer thin film which leaves template molecular configuration holes is prepared by using methanol solution to carry out ultrasonic elution for 6min and removing the template molecules from the electrode. The detection is carried out through the differential pulse method, and the linear range is 0.50-7.50mg / kg. The response time is 10 seconds. The molecular imprinting electrochemical sensor can be used for detecting an actual liquid milk sample without pretreatment, the selectivity is good, and the recovery rate of adding standard is 87.5-109%.

Description

technical field [0001] The invention relates to a molecular imprinting material prepared by electropolymerization on a gold electrode by an electrochemical method, and the novel membrane material has characteristic recognition performance for melamine. The invention belongs to the technical field of preparing novel materials for food safety detection by using an electrochemical method. Background technique [0002] Melamine (MAM) is a triazine nitrogen-containing heterocyclic organic compound, which is usually used as a chemical raw material. Since the nitrogen content of melamine is as high as 66.63%, the current determination of protein content in milk is based on the "Kjeldahl method" commonly used in the food industry, which is an indirect calculation method by measuring the content of nitrogen atoms in food , It is impossible to distinguish protein from other nitrogen-containing substances such as melamine, so it is impossible to correctly judge whether the protein con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/38C08J9/26G01N27/26
Inventor 崔莉凤赵硕申晴
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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