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Colorimetric and/or SERS detection method for pesticide residues, and preparation method for detection colloid

A pesticide residue and detection method technology, applied in the field of food safety detection, can solve the problems of in-situ SERS measurement, difficulty in grasping the measurement time, violent colorimetric reaction, etc. The effect of sensitivity

Active Publication Date: 2019-12-20
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In summary, the current problems of colorimetric / SERS combined technology in pesticide detection are: 1. The measurement object is mainly liquid samples, which have limitations in the measurement of pesticides in fruits and vegetables (solid); 2. Colorimetric reaction Violent and uncontrollable, it is difficult to grasp the measurement time and affect the measurement accuracy; 3. The in-situ measurement of SERS has not been realized

Method used

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  • Colorimetric and/or SERS detection method for pesticide residues, and preparation method for detection colloid
  • Colorimetric and/or SERS detection method for pesticide residues, and preparation method for detection colloid
  • Colorimetric and/or SERS detection method for pesticide residues, and preparation method for detection colloid

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Embodiment 1

[0053] combine figure 1 , this embodiment describes in detail the colorimetric detection method of pesticide residues of the present invention, as figure 1 As shown, it includes the following steps:

[0054] S11: preparing polyvinyl alcohol-gold nanoparticles (PVA-Au) colloid;

[0055] S12: Establish a standard calibration curve for the concentration colorimetric method of the pesticide to be detected on the PVA-Au colloid;

[0056] S13: Measure the concentration of the pesticide to be detected remaining in the fruit and vegetable samples to be detected according to the standard calibration curve of the concentration colorimetric method.

Embodiment 2

[0058] combine figure 2 , this embodiment describes in detail the SERS detection method for pesticide residues of the present invention, as figure 2 As shown, it includes the following steps:

[0059] S11: preparing polyvinyl alcohol-gold nanoparticles (PVA-Au) colloid;

[0060] S12: Establish a standard calibration curve for the concentration colorimetric method of the pesticide to be detected about the polyvinyl alcohol-gold nanoparticle colloid;

[0061] S14: Using a Raman spectrometer to perform surface-enhanced Raman spectroscopy detection on the surface of the fruit and vegetable sample to be detected that has been dripped with PVA-Au colloid, so as to confirm its fingerprint spectral information, thereby determining the type of pesticide to be detected.

Embodiment 3

[0063] combine image 3 , this embodiment describes in detail the colorimetric and SERS detection methods of pesticide residues of the present invention, as image 3 As shown, it includes the following steps:

[0064] S11: preparing polyvinyl alcohol-gold nanoparticles (PVA-Au) colloid;

[0065] S12: Establish a standard calibration curve for the concentration colorimetric method of the pesticide to be detected about the polyvinyl alcohol-gold nanoparticle colloid;

[0066] S13: Measure the concentration of the pesticide to be detected remaining in the fruit and vegetable samples to be detected according to the standard calibration curve of the concentration colorimetric method;

[0067] S14: Use a Raman spectrometer to perform surface-enhanced Raman spectroscopy detection on the surface of the fruit and vegetable samples to be detected dripped with polyvinyl alcohol-gold nanoparticle colloids to confirm the fingerprint spectral information, thereby determining the type of p...

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Abstract

The invention discloses a colorimetric and / or SERS detection method for pesticide residues, and a preparation method for a detection colloid. The detection method comprises the following steps of preparing a polyvinyl alcohol-gold nanoparticle colloid; establishing a concentration colorimetric standard calibration curve of the pesticide to be detected about the polyvinyl alcohol-gold nanoparticlecolloid; measuring the concentration of the pesticide to be detected in fruit and vegetable samples to be detected according to the concentration colorimetric standard calibration curve; and / or, usingRaman spectrometer to perform surface-enhanced Raman spectroscopy detection on the surface of the fruit and vegetable samples to be detected with the polyvinyl alcohol-gold nanoparticle colloid, so as to confirm the fingerprint spectral information thereof. The preparation method comprises the step of mixing the polyvinyl alcohol powder with a gold nanoparticle solution to obtain a polyvinyl alcohol-gold nanoparticle colloid. Through the invention, the colorimetric process is made stable and controllable, thereby improving the stability and accuracy of the detection system. In addition, the sensitivity is improved, and the in-situ detection is realized.

Description

technical field [0001] The invention relates to the technical field of food safety detection, in particular to a colorimetric and / or SERS detection of pesticide residues and a method for preparing a detection colloid. Background technique [0002] Pesticides have been widely used to control pests and diseases and regulate plant growth. However, pesticide residues are potentially harmful to the environment and even cause health problems such as neurotoxicity, liver disease, and even cancer. Therefore, it is of great significance to realize the in-situ detection of pesticide residues in fruits and vegetables. Analytical methods such as gas chromatography, liquid chromatography, high performance liquid chromatography, and mass spectrometry have been widely used for the detection of pesticide residues, and the detection results of these methods have high precision and are considered as the gold standard. However, the above-mentioned methods have some disadvantages, they are us...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N21/65G01N21/55G01N33/02B82Y40/00
CPCB82Y40/00G01N21/55G01N21/658G01N21/78G01N33/025
Inventor 黄梅珍孔丽丽陈婕
Owner SHANGHAI JIAO TONG UNIV
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