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Magnetic solid-phase extraction agent, preparation method and application thereof

A solid-phase extraction agent and magnetic technology, applied in the field of magnetic solid-phase extraction agent and preparation, can solve the problems of difficult analysis and complex sample matrix.

Active Publication Date: 2021-05-18
SHANDONG ANALYSIS & TEST CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Analysis of plant growth regulator residues in fruits and vegetables is difficult because they are often at trace levels and the sample matrix is ​​often complex

Method used

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  • Magnetic solid-phase extraction agent, preparation method and application thereof
  • Magnetic solid-phase extraction agent, preparation method and application thereof
  • Magnetic solid-phase extraction agent, preparation method and application thereof

Examples

Experimental program
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Embodiment approach

[0037] The third embodiment of the present invention provides an application of the above-mentioned magnetic solid-phase extraction agent in the detection of plant growth regulators in tomatoes.

[0038] The fourth embodiment of the present invention provides a method for detecting plant growth regulators in tomatoes based on magnetic solid-phase extraction. The tomatoes are made into a sample solution, and the above-mentioned magnetic solid-phase extraction agent is used for magnetic solid-phase extraction of the sample solution. The solution to be tested is obtained, and the solution to be tested is detected by liquid chromatography tandem mass spectrometry.

[0039]In some examples of this embodiment, the ratio of the magnetic solid-phase extraction agent to the tomato used to make the solution to be tested is 3.4-3.6:1, mg:g.

[0040] In some examples of this embodiment, the process of preparing the sample solution from tomatoes is as follows: chop the tomatoes, then homog...

Embodiment

[0049] Synthesis of magnetic adsorption materials:

[0050] Synthesis of BNNSs (boron nitride nanosheets): First, weigh 0.3092g of boric acid and 9.0098g of urea in a beaker, add 10mL of ultrapure water and 10mL of methanol, and stir mechanically to form a uniform mixture. Then, the mixture was kept at 45°C until the solvent evaporated completely. Subsequently, the mixture was placed in a tube furnace at 5 °C min under a nitrogen atmosphere -1 The heating rate is heated to 1000 ° C, and the reaction is 3h. Finally, the tube furnace was naturally cooled to room temperature to obtain white BNNSs.

[0051] Fe 3 o 4 Synthesis of @BNNSs: First, 100mg of BNNSs was dispersed into 50mL of ultrapure water, and then 0.695g of FeSO 4 ·7H 2 O, the mixture was stirred for 10 min. Then, the pH of the solution was adjusted to 11 by adding ammonia water dropwise. Stir mechanically in a 90 °C oil bath for 6 h. After the reaction was completed, it was cooled to room temperature, and th...

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Abstract

The invention discloses a magnetic solid-phase extraction agent, a preparation method and an application thereof. The preparation method comprises the following steps: preparing boron nitride nanosheets from a boric acid and urea, uniformly mixing the boron nitride nanosheets and ferrous salt in water, dropwise adding ammonia water to adjust a pH value to be alkaline, heating to 85-95 DEG C, reacting, and separating and drying a magnetic solid to obtain the Fe3O4 and boron nitride nanosheet compounded magnetic solid-phase extraction agent. According to the invention, with the combination of the magnetic solid phase extraction agent and the liquid chromatography-tandem mass spectrometry, trace analysis can be performed on six plant growth regulators (indole-3-acetic acid, indole-3-butyric acid, 3-indolepropionic acid, 1-naphthylacetic acid, 2-naphthoxyacetic acid and abscisic acid) in tomatoes.

Description

technical field [0001] The invention relates to the technical field of detection of residual drugs in fruits and vegetables, in particular to a magnetic solid-phase extraction agent, a preparation method and an application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Plant growth regulators are a class of organic compounds that are naturally formed or synthesized in plants. They are widely used in the cultivation of fruits and vegetables to promote their growth, development and reproduction. However, unreasonable or excessive use of plant growth regulators can also threaten food safety and human health, such as premature maturation, impaired reproductive ability, car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/06G01N30/02
CPCG01N30/06G01N30/02G01N2030/062
Inventor 李娜赵汝松李梦君徐桂菊姜海龙赵凌曦
Owner SHANDONG ANALYSIS & TEST CENT
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