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Portable Raman spectroscopy method for detecting pesticide residues in instant tea powder

A Raman spectrum detection, pesticide residue technology, applied in Raman scattering, material excitation analysis and other directions, can solve the problem of pesticide residue detection effect to be improved, no fluorescence characteristics, etc., to achieve fast detection speed, high sensitivity, improve detection effect of speed

Inactive Publication Date: 2019-05-14
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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  • Portable Raman spectroscopy method for detecting pesticide residues in instant tea powder
  • Portable Raman spectroscopy method for detecting pesticide residues in instant tea powder
  • Portable Raman spectroscopy method for detecting pesticide residues in instant tea powder

Examples

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Embodiment 1

[0032] Implementation Example 1 In order to further verify the detection method prepared by the present invention to the detection of small molecule pesticides in fermented black tea, the example of the present invention takes the detection of 2,4-D pesticides in fermented black tea as an example, and the specific operation steps are as follows:

[0033] 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.

[0034] 2) Assembly of AuNP: inject a certain amount of HAuCl under the above mesoporous silica film 4 , After standing for a period of time, the film turned light yellow, took out the light yellow fi...

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Abstract

The invention discloses a portable Raman spectroscopy method for detecting pesticide residues in instant tea powder, and belongs to the technical field of food monitoring and the like. The method comprises the steps of firstly generating gold nanoparticles by in situ chemical reduction on a mesoporous silica film formed at the air-water interface, constructing a gold nano surface-enhanced Raman substrate (AuMSF) that can be used as a label-free SERS substrate to enhance the Raman signal after electrostatic adsorption with pesticide molecules with mesoporous structure, secondly establishing quantitative models of different pesticides by a chemometrics method using the Raman spectrum collected by portable Raman spectroscopy, and applying the quantitative models to the pesticide residue detection of fermented black tea. The method has the advantages of simple operation, high detection speed, high precision and good stability, and can realize on-line detection of pesticide residues in thefermented black tea.

Description

technical field [0001] The invention introduces a portable Raman spectrum detection method for pesticide residues in instant tea powder, and belongs to the technical fields of food safety and intelligent detection of material chemistry. Background technique [0002] Tea has a history of more than one thousand years in our country, and has become a closely related life drink for people with its clear taste and rich nutritional value. At present, the main measures for the prevention and control of plant diseases and insect pests in the tea industry are chemical pesticides, which makes the problem of pesticide residues inevitable. Therefore, the importance of pesticide residue detection is becoming more and more prominent, and the analysis and detection results show a higher goal. The reduction of pesticide residue limit standards and the increase of detection items in countries all over the world show higher requirements for its analysis and detection methods. Conventional pe...

Claims

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Application Information

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IPC IPC(8): G01N21/65
Inventor 许艺陈全胜谢世彩格桑洁李欢欢王安成欧阳琴
Owner JIANGSU UNIV
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