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Paper-based chip for detecting pesticide residues in fruits and vegetables as well as preparation method and application thereof

A technology of pesticide residues and paper-based chips, which can be used in measuring devices, instruments, and material analysis through optical means, can solve the problems of cumbersome preparation, poor applicability, and poor stability, and achieve wide application range, high sensitivity, and extensibility Good results

Inactive Publication Date: 2018-08-24
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of the above-mentioned traditional Raman base materials such as cumbersome preparation, poor applicability and poor stability, the present invention provides a paper-based chip for detecting pesticide residues in fruits and vegetables, its preparation method and application

Method used

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  • Paper-based chip for detecting pesticide residues in fruits and vegetables as well as preparation method and application thereof
  • Paper-based chip for detecting pesticide residues in fruits and vegetables as well as preparation method and application thereof
  • Paper-based chip for detecting pesticide residues in fruits and vegetables as well as preparation method and application thereof

Examples

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Embodiment 1

[0032] (1) Preparation of silver colloid solution

[0033] At room temperature, measure 40ml of glycerin and 60ml of deionized water into a three-necked flask, and stir evenly until the mixture is complete. Heat slowly to 95°C under reflux. When the temperature is stabilized at 95°C, quickly add AgNO 3 Solution (preparation of 18mgAgNO 3 in 2ml of water), add sodium citrate solution (60mg of sodium citrate dissolved in 4ml of water) after 1-2min, and keep this temperature at 95°C for 1h. Cool to room temperature after one hour, centrifuge at 8000r to remove excess sodium citrate, wash with double distilled water, and finally obtain 9.22×10 -2 The mg / mL silver sol is sealed and stored at 4°C, and the silver particle size is between 20-30nm.

[0034] (2) Reduction of graphene oxide aqueous solution

[0035] At room temperature, add 5ml graphene oxide aqueous solution (2mg / ml) and 5ml hydrazine hydrate (35%) into a three-necked flask, stir thoroughly, then add 100μl ammonia ...

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PUM

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Abstract

The invention discloses a paper-based chip for detecting pesticide residues in fruits and vegetables as well as a preparation method and application thereof. The preparation method comprises the following specific steps: (1) preparing a silver colloid solution through a sodium citrate reduction method; (2) reducing graphene oxide by utilizing hydrazine hydrate to prepare a graphene solution; (3) injecting the graphene solution into an ink box; printing graphene with different layer numbers on paper through an ink-jet printer to obtain a graphene test paper substrate; (4) injecting the silver colloid solution into the ink box and printing silver nanoparticles with different layer numbers on the graphene test paper substrate through the ink-jet printer, so as to prepare the paper-based chipfor detecting the pesticide residues in the fruits and vegetables. The preparation method disclosed by the invention is simple; the surfaces of the fruits and vegetables are simply wiped and pesticideresidue molecules are rapidly adsorbed on the surface of filter paper, so that the pesticide residues are qualitatively and quantitatively detected; the detection limit is low and the paper-based chip has very great advantages in rapid and convenient detection of the fruits and vegetables.

Description

technical field [0001] The invention belongs to the technical field of pesticide residue detection, and in particular relates to a paper-based chip for detecting pesticide residues in fruits and vegetables, a preparation method and application thereof. Background technique [0002] Pesticide residues refer to the phenomenon that a part of pesticides directly or indirectly remain in grains, vegetables, fruits, livestock products, aquatic products, soil and water after pesticides are applied in agricultural production. Some of the pesticides applied to crops are attached to the crops, some are scattered in the soil, air and water environment, and some of the pesticides remaining in the environment will be absorbed by plants. According to the survey results, some collective food poisoning is mainly caused by eating fruits and vegetables with high pesticide residues. Therefore, pesticide residues in fruits and vegetables have become an important issue that endangers the environ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/65G01N21/658G01N2021/655
Inventor 李丹马亚丹高慧敏段化珍杜乐康娜娜邓维
Owner SHANGHAI INST OF TECH
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