A molecularly imprinted electrochemical sensor for rapid detection of trace amounts of cyromazine, its preparation method and application

A technology of molecular imprinting and cyromazine, applied in the direction of material electrochemical variables, scientific instruments, instruments, etc., can solve problems such as complex detection steps, achieve simplified pretreatment process, strong enrichment ability, and improve electrochemical response signal Effect

Inactive Publication Date: 2019-05-31
XINYANG NORMAL UNIVERSITY +1
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Problems solved by technology

[0007] In order to overcome the defects in the prior art that the detection of cyromazine needs to be completed with the help of expensive instruments and the detection steps are complicated, the present invention provides a method based on monodisperse SiO 2 @TiO 2 Molecularly imprinted electrochemical sensor for rapid detection of cyromazine with trace amounts of nanospheres and its preparation method, which can effectively reduce the interference of complex matrix components and obtain satisfactory results and detection sensitivity

Method used

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  • A molecularly imprinted electrochemical sensor for rapid detection of trace amounts of cyromazine, its preparation method and application
  • A molecularly imprinted electrochemical sensor for rapid detection of trace amounts of cyromazine, its preparation method and application
  • A molecularly imprinted electrochemical sensor for rapid detection of trace amounts of cyromazine, its preparation method and application

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preparation example Construction

[0036] The preparation method of the molecularly imprinted electrochemical sensor for rapid detection of trace amounts of cyromazine comprises the following steps:

[0037] Step (1), monodisperse SiO 2 Synthesis of microspheres:

[0038] through improved method to prepare monodisperse SiO with a diameter of about 300 nm 2 MSs; the mixture of 260mL ethanol, 90mL water and 36mL ammonia water was heated to 50°C, and 18mL tetraethyl orthosilicate (TEOS) was quickly added to it under vigorous stirring; after aging for 6h, the SiO was separated by centrifugation 2 The microspheres were then washed three times with distilled water and absolute ethanol, and dried overnight at 60°C;

[0039] Step (2), monodisperse SiO 2 @TiO 2 Synthesis of core-shell nanospheres:

[0040] Weigh 0.5g of SiO prepared in step (1) 2 Disperse the microspheres in 200mL ethanol, sonicate for 30min, add 1.0mL tetrabutyl titanate (TBOT) under vigorous stirring; continue stirring at room temperature for ...

Embodiment

[0056] Molecularly imprinted electrochemical sensor for rapid detection of trace amounts of cyromazine, including a working electrode, a reference electrode, and a counter electrode; it is characterized in that: the working electrode is a glassy carbon electrode, and monodisperse SiO is firstly used2 @TiO 2 Modified core-shell nanospheres, and then used in-situ electrochemical polymerization and sol-gel methods to further prepare surface molecularly imprinted membranes for specific recognition of cyromazine;

[0057] The preparation method of the molecularly imprinted electrochemical sensor for rapid detection of trace amounts of cyromazine comprises the following steps:

[0058] Step (1), monodisperse SiO 2 Synthesis of microspheres:

[0059] through improved method to prepare monodisperse SiO with a diameter of about 300 nm 2 MSs. Heat the mixture of 260mL ethanol, 90mL water and 36mL ammonia water to 50°C, and quickly add 18mL tetraethyl orthosilicate (TEOS) into it un...

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Abstract

The invention discloses a molecularly imprinted electrochemical sensor for CYR trace rapid detection. The molecularly imprinted electrochemical sensor for the CYR trace rapid detection comprises a working electrode, a reference electrode and a counter electrode; the working electrode is a glassy carbon electrode, and modified by using monodispersed SiO2@TiO2 core-shell nanoparticles firstly, and then a surface molecularly imprinted membrane is further prepared for realizing specific recognition of CYR by using a in-situ electrochemical polymerization method and sol-gel method. The molecularly imprinted electrochemical sensor has strong selectivity and high sensitivity for CYR, and is simple in sample pretreatment steps, rapid and simple in method and satisfactory in detection results of actual vegetable samples. The molecularly imprinted electrochemical sensor prepared by the invention is successfully applied to detection of CYR in cucumbers, mushrooms, Chinese chives and celery, and further good all in sensitivity, accuracy, precision and selectivity.

Description

technical field [0001] The invention relates to a molecularly imprinted electrochemical sensor for rapidly detecting trace amounts of cyromazine, a preparation method and application thereof. Background technique [0002] Cyromazine (CYR) is a triazine-type nitrogen-containing heterocyclic organic compound with the chemical name N-cyclopropyl-1,3,5-triazine-2,4,6 triamine, which is strongly systemic Insect growth regulator. As a pesticide, cyromazine has been registered in many countries. In my country, it is mainly used to prevent and control Liriomyza sativae and Leafminer on vegetables such as cucumbers, kidney beans, and leeks. fly. In order to ensure food safety, many countries and regions and international organizations have established their residue limits in agricultural products. For example, the residue limit of cyromazine is: 0.2mg / kg in China and Japan, and 1mg / kg in the European Union. A method for detecting cyromazine was established, which can be used to an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/48G01N27/30
CPCG01N27/308G01N27/48
Inventor 甘甜黄建联孙俊永刘彦明赵爱霞王志凯吕玲
Owner XINYANG NORMAL UNIVERSITY
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