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Electrochemical method for rapidly detecting fenitrothion pesticide residue

A technology for phosphalt and pesticide residues, applied in the field of biosensing, can solve the problems of strict sample pretreatment requirements, high technical requirements of operators, long detection cycle, etc., and achieves low cost, shortened analysis time, and reproducibility. high effect

Inactive Publication Date: 2016-12-21
JIANGSU UNIV
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Problems solved by technology

Although these methods can effectively carry out trace analysis of pesticide residues, they also have the following disadvantages: expensive equipment, high technical requirements for operators, strict sample pretreatment requirements, long detection cycle, high cost, etc.

Method used

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  • Electrochemical method for rapidly detecting fenitrothion pesticide residue
  • Electrochemical method for rapidly detecting fenitrothion pesticide residue

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Embodiment Construction

[0034] Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail, and concrete operation method is as follows:

[0035] (1) Preparation of 1% chitosan solution

[0036] Add 0.5 mL of acetic acid to 49.5 mL of secondary water to prepare a 1% acetic acid solution. Take 2 mL of 1% acetic acid solution, add 0.02 g chitosan, and stir ultrasonically until it dissolves to obtain 1% chitosan (W / V), and store it in a refrigerator at 4 °C.

[0037] (2) Synthesis of AuNRs / CS mixture

[0038] The AuNRs solution and 1% chitosan solution were mixed, sonicated for 30 min to make them evenly mixed, and stored in a refrigerator at 4 °C.

[0039] The AuNRs solution in step (2) has an aspect ratio of 3.4 and a concentration of 185.13 μg mL -1 .

[0040] The volume ratio of AuNRs solution and 1% chitosan solution in step (2) is 5:1.

[0041] (3) Working electrode pretreatment

[0042] The bare glassy carbon electrode was repeatedly po...

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Abstract

The invention discloses an electrochemical method for rapidly detecting fenitrothion pesticide residue, and belongs to the technical field of biological sensing. According to the present invention, fenitrothion has the good oxidation reduction characteristic on the electrode surface and a gold nano-rod nanometer composite material has advantages of strong adsorption ability, good conductivity and the like, such that the rapid enrichment and the high sensitivity detection of the fenitrothion pesticide can be achieved; the prepared gold nano-rod / chitosan / glassy carbon electrode is used to perform the electrochemical detection on the fenitrothion pesticide; the results show that the linear detection range of the electrochemical sensor on the fenitrothion pesticide is 5-300 ng mL<-1>, the detection limit is 1.74 ng mL<-1>, and the electrochemical sensor is successfully used for the quantitative determination of the fenitrothion in the vegetable sample; and compared with the traditional organophosphorus pesticide residue detection method, the method of the present invention has advantages of convenience, rapidness, simple operation, high sensitivity, good reproducibility, and direct and rapid detection of the fenitrothion pesticide residue.

Description

technical field [0001] The invention provides a highly sensitive electrochemical method for quickly detecting fenitrothion pesticide residues, belonging to the technical field of biosensing. Background technique [0002] In my country's agricultural production, the extensive use of organophosphorus pesticides has increased the output of agricultural products on the one hand, and on the other hand has also brought serious pesticide residue problems. On the one hand, residual organophosphorus pesticides can enter the human body through diet, contact, breathing, etc., and interact with acetylcholinesterase in the nervous system to form a phosphorylated acetylcholinesterase complex, which is difficult to hydrolyze, which will cause Causes loss of cholinesterase activity. Inactivated cholinesterase makes the substrate acetylcholine unable to degrade, leading to a large accumulation of acetylcholine on the synapses, interfering with the normal conduction of nerve impulses, maki...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48
CPCG01N27/48
Inventor 韩恩张媛媛程喜红蔡健荣
Owner JIANGSU UNIV
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