Method for detecting 2,4-dichlorophenoxyacetic acid (2, 4-D) pesticide based on gold nanofilm SERS technology

A technology of dichlorophenoxyacetic acid and detection method, which is applied in Raman scattering, material excitation analysis and other directions, can solve the problems of pesticide residue detection effect to be improved, lack of fluorescence characteristics, etc., and achieves detection speed, high sensitivity and precision. high effect

Inactive Publication Date: 2018-07-31
JIANGSU UNIV
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Problems solved by technology

For example, hyperspectral technology and infrared spectroscopy test the spectral statistical characteristics of pesticides, which are suitable for the detection of higher concentrations of pesticides, but the detection effect of trace or trace pesticide residues needs to be improved; because some pesticides do not have fluorescence characteristics, optical spectroscopy technology It also has certain limitations in the scope of application

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  • Method for detecting 2,4-dichlorophenoxyacetic acid (2, 4-D) pesticide based on gold nanofilm SERS technology
  • Method for detecting 2,4-dichlorophenoxyacetic acid (2, 4-D) pesticide based on gold nanofilm SERS technology
  • Method for detecting 2,4-dichlorophenoxyacetic acid (2, 4-D) pesticide based on gold nanofilm SERS technology

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Embodiment 1

[0029] Implementation example 1 In order to further verify the detection effect of the detection method prepared by the present invention on small molecule pesticides in food, the example of the present invention takes the detection of 2,4-D pesticides in milk as an example, and the specific operation steps are as follows:

[0030] 1) Preparation of air-water interface mesoporous silica: In aqueous hydrochloric acid solution with ph<2, cetyltrimethylammonium bromide, tetramethoxysilane and tungstophosphoric acid were stirred and dissolved in sequence. After the solution was stirred evenly, 30ml was taken and put into a petri dish and covered with a lid to seal it. After standing for 24 hours at 25°C, a transparent film was grown at the air-water interface.

[0031] 2) Assembly of AuNP: inject a certain amount of 5mM HAuCl under the above-mentioned mesoporous silica film 4， After standing still for 30 minutes, the film turned pale yellow, and after irradiating with 254nm ultrav...

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Abstract

The invention discloses a method for detecting a 2,4-dichlorophenoxyacetic acid (2, 4-D) pesticide based on a gold nanofilm SERS technology, and belongs to the technical field of food monitoring and the like. With the method, firstly gold nanoparticles are produced on a mesoporous silicon dioxide film formed at an air-water interface through in-situ photo induced reduction, a gold nano surface-enhanced Raman substrate with a mesoporous structure is constructed, a Raman signal is enhanced after electrostatic adsorption of the densely arranged gold nanoparticles in the field and 2, 4-D molecules, and a standard curve for 2, 4-D detection is established. With the method, the operation is simple, the detection speed is high, the precision is relatively high, the stability is good, and the 2, 4-D pesticide can be detected in situ.

Description

technical field [0001] The invention introduces a detection method of 2,4-dichlorophenoxyacetic acid (2,4-D) pesticide based on gold nanofilm SERS technology, and prepares a surface Raman-enhanced substrate of ordered gold nanofilm to enhance pesticide The Raman signal of 2,4-D, the theoretical Raman spectrum of pesticide 2,4-D was calculated by density functional theory, and the standard curve for quantitative detection of 2,4-D pesticide was established. The method of the invention is simple in operation, fast in detection speed, high in precision, good in stability, etc., and can realize mass in-situ detection of 2,4-D. The method is applicable to technical fields such as food safety and material chemistry. Background technique [0002] 2,4-Dichlorophenoxyacetic acid (2,4-D) is a representative synthetic auxin and a major herbicide. It can also be used as a plant production regulator and is used to induce callus formation. One of the commonly used auxin analogues. If 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 陈全胜许艺陈敏程武李欢欢欧阳琴王井井刘双双
Owner JIANGSU UNIV
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