Methyl-parathion molecularly-imprinted electrochemical sensor and preparation method thereof

A technology of methyl parathion and molecular imprinting, applied in the direction of material electrochemical variables, etc., can solve the problems of expensive detection equipment, high requirements for sample pretreatment, poor selectivity, etc.

Inactive Publication Date: 2014-03-26
CHONGQING UNIV
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Problems solved by technology

The selectivity of the existing detection method is poor, the detection equipment is expensive, the cost is high, th

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  • Methyl-parathion molecularly-imprinted electrochemical sensor and preparation method thereof
  • Methyl-parathion molecularly-imprinted electrochemical sensor and preparation method thereof

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Embodiment Construction

[0027] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0028] The concept of the present invention is: use graphene-nano-gold composite material to modify the glassy carbon electrode as the base electrode, add methyl parathion molecular imprinting liquid on the surface of the modified base electrode, and form molecular imprinting by thermal polymerization membrane, and then use a suitable eluent and elution method to remove the template molecule, so that the sensor membrane leaves a molecular imprinted hole that recognizes the methyl parathion molecule; because the imprinted hole has the characteristics of binding to the template molecule of a specific structure , showing high selectivity with corresponding template molecules, so the molecularly imprinted electrochemical sensor for methyl parathion of the present invention realizes good selective recognition for methyl parathion.

[0029] The molecularly imprinte...

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Abstract

The invention discloses a methyl-parathion molecularly-imprinted electrochemical sensor and a preparation method thereof. The sensor comprises a glassy carbon electrode, wherein the glassy carbon electrode is covered with a carboxyl graphene-nanogold composite coating, and molecularly-imprinted holes corresponding to methyl-parathion molecules are formed in the carboxyl graphene-nanogold composite coating. The preparation method comprises four steps as follows: synthetizing a carboxyl graphene-nanogold composite; using the carboxyl graphene-nanogold composite to modify the glassy carbon electrode; forming a methyl-parathion molecularly-imprinted template; removing methyl-parathion molecularly-imprinted template molecules. Through an electrochemical performance test, the sensitivity of the methyl-parathion molecularly-imprinted electrochemical sensor is high. A methyl-parathion solution with the concentration being 4*10-8 mol.L<-1> is compared with a methyl-parathion solution with the concentration being 0, current curves are obviously changed, and thus micro trace detection on the low-concentration methyl parathion is realized.

Description

technical field [0001] The invention belongs to the technical field of molecularly imprinted electrochemical sensors, in particular to a methyl parathion molecularly imprinted electrochemical sensor and a preparation method thereof. Background technique [0002] Methyl parathion is a typical high-efficiency organophosphate pesticide, which is highly toxic and highly toxic, and is widely used as an agricultural insecticide. At present, the production of pesticides in my country is still dominated by insecticides, and the use of pesticides is particularly extensive. As far as crops are concerned, the largest amount of pesticides per unit area in my country accounts for 10% of the sown area of ​​crops, and the problem of pesticide residues in vegetables is the most serious. Due to the actual production and use of pesticides in our country, it is not uncommon to be poisoned by eating vegetables every year. In addition, the illegal use of pesticides has led to other food safety ...

Claims

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Application Information

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IPC IPC(8): G01N27/26G01N27/30
Inventor 法焕宝毛亚丽杜艳秋尹伟成艳梅侯长军霍丹群罗小刚
Owner CHONGQING UNIV
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