Method for rapidly detecting residuals of organophosphorus pesticides in vegetables by utilizing Au nano-particle colorimetric method

A technology of gold nanoparticles and organophosphorus pesticides, applied in the field of analytical chemistry, can solve the problems of high cost, long measurement time, unsuitable for rapid detection, etc., and achieve the effect of convenient supervision

Inactive Publication Date: 2011-10-19
JILIN UNIV
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Problems solved by technology

Although these methods have high sensitivity, these methods require expensive equipment, long measurement time, h...

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  • Method for rapidly detecting residuals of organophosphorus pesticides in vegetables by utilizing Au nano-particle colorimetric method
  • Method for rapidly detecting residuals of organophosphorus pesticides in vegetables by utilizing Au nano-particle colorimetric method
  • Method for rapidly detecting residuals of organophosphorus pesticides in vegetables by utilizing Au nano-particle colorimetric method

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Embodiment Construction

[0027] Preparation of Gold Nanoparticles AuNPs

[0028] Materials / Reagents: Chlorauric acid and trisodium citrate were purchased from Beijing Chemical Factory.

[0029] Method: All glassware was soaked in aqua regia, washed with double-distilled water, and dried for later use. The distilled water used to prepare the reagents should be filtered through a 0.45 μm filter membrane; during preparation, 1 mmol / L of gold chloride was added to a clean three-necked flask. Acid 50mL, make it boil under stirring, then quickly add 38.8mmol / L trisodium citrate 5mL, stir while heating, the solution changes from light yellow to wine red, the reaction lasts for 10 minutes, stop heating, the solution After cooling to room temperature, it was filtered through a 0.45 μm microporous membrane and stored at 4°C.

[0030] RESULTS: Characterized by transmission electron microscope, the obtained gold nanoparticles had a particle size of 13 nm, good dispersibility and uniform particle size.

[0031] ...

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Abstract

The invention relates to a method for rapidly detecting the residuals of organophosphorus pesticides in vegetables by utilizing an Au nano-particle colorimetric method, which belongs to the technical field of analytical chemistry. The method provided by the invention comprises the following detection steps: preparation of Au nano-particles (AuNps); establishment of a method for detecting organophosphorus pesticides, actual sample detection and the like. The method provided by the invention can simply, rapidly and sensitively detect methamidophos in the organophosphorus pesticides according to the color change of an Au nano-particle system, has high sensitivity and provides convenience for further research, production, supervision and the like.

Description

technical field [0001] A method for rapid detection of organophosphorus pesticide residues in vegetables by gold nanoparticle colorimetry belongs to the technical field of analytical chemistry. Background technique [0002] Organophosphorus pesticides are mainly used as agricultural pesticides, and a few varieties are used as fungicides, herbicides and defoliants. This class of pesticides has good insecticidal effect and short residual effect period, but has certain toxicity to warm-blooded animals, and the toxicity is related to chemical structure. Most of them belong to medium and low toxicity, and a few belong to high toxicity. The general formula of organophosphorus pesticides is as follows: [0003] [0004] R in the above formula 1 and R 2 Most are methyl and ethyl, and X is an alkoxy, aryl, halogen or heterocyclic substituent group. [0005] Organophosphorus pesticides can bind to the hydroxyl group on serine in the active center of acetylcholinesterase (AChE)...

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Application Information

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IPC IPC(8): G01N21/31G01N21/33
Inventor 孙春燕李宏坤平红张民伟郭佳佳刘吕睿
Owner JILIN UNIV
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