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Application of fluorescent nitrogen-doped carbon quantum dots in selective recognition of nitroaniline compounds and a solid-phase microextraction probe

A technology of carbon quantum dots and nitroaniline, which is applied in the field of solid-phase microextraction probes, can solve the limitations of the development and application of solid-phase microextraction technology, the inability to determine the concentration range of the analyte in the sample, and the unsatisfactory enrichment effect of the analyte and other problems, to achieve the effect of fast and simple preparation steps, stable fluorescence effect, and controllable thickness

Active Publication Date: 2021-05-11
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although some coatings have been commercialized, these probes have disadvantages such as high price (800-900 yuan per piece), low selectivity, unsatisfactory enrichment effect for certain analytes, and easy breakage of the extraction head, making it difficult to satisfy The separation and analysis of actual complex samples requires and greatly limits the further development and application of solid phase microextraction technology
On the other hand, the probes prepared by the prior art cannot determine the concentration range of the analyte in the sample before analysis and detection

Method used

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  • Application of fluorescent nitrogen-doped carbon quantum dots in selective recognition of nitroaniline compounds and a solid-phase microextraction probe
  • Application of fluorescent nitrogen-doped carbon quantum dots in selective recognition of nitroaniline compounds and a solid-phase microextraction probe
  • Application of fluorescent nitrogen-doped carbon quantum dots in selective recognition of nitroaniline compounds and a solid-phase microextraction probe

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Embodiment 1

[0046] Embodiment 1 A fluorescent nitrogen-doped carbon quantum dot 1

[0047] Preparation of nitrogen-doped carbon quantum dot material: The material is synthesized according to the literature (Nanoscale 2014, 6, 10307), and the synthesis method is as follows:

[0048] 3 g of calcium citrate and urea were placed in 10 mL of ultrapure water, and ultrasonicated for 15 min to obtain a uniform dispersion. Then the dispersion was placed in a microwave oven with a power of 800 W for 5 min to obtain nitrogen-doped carbon quantum dot solid powder.

[0049] figure 1 It can be observed that the obtained nitrogen-doped carbon quantum dot solid powder is khaki, and emits yellow-green fluorescence under ultraviolet light.

Embodiment 2

[0050] Embodiment 2 A fluorescent nitrogen-doped carbon quantum dot 2

[0051] 4.2 g of magnesium citrate and 3 g of urea were placed in 10 mL of ultrapure water, and ultrasonicated for 15 min to obtain a uniform dispersion. Subsequently, the dispersion liquid was placed in a microwave oven with a power of 900 W for 4 minutes to obtain a nitrogen-doped carbon quantum dot solid powder.

Embodiment 3

[0052] Embodiment 3 A fluorescent nitrogen-doped carbon quantum dot 3

[0053] 1.3 g of citric acid monohydrate and 3 g of urea were placed in 10 mL of ultrapure water, and ultrasonicated for 15 min to obtain a uniform dispersion. Subsequently, the dispersion liquid was placed in a microwave oven with a power of 600 W for 9 minutes to obtain a nitrogen-doped carbon quantum dot solid powder.

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Abstract

The present invention relates to the application of fluorescent nitrogen-doped carbon quantum dots in the selective recognition of nitroaniline compounds and a solid-phase microextraction probe. The present invention also relates to a fluorescent nitrogen-doped carbon quantum dot solid-phase microextraction probe. The solid-phase microextraction probe includes a stainless steel wire and a surface coating coated on the stainless steel wire, and the surface coating contains fluorescent nitrogen-doped carbon quantum dots. The fluorescent nitrogen-doped carbon quantum dots of the present invention have the advantages of long fluorescence lifetime, stable fluorescence effect, selective recognition of nitroaniline compounds, etc., and strong yellow-green fluorescence in both solid state and solution state. The solid-phase microextraction probe provided by the present invention has a good enrichment performance for o-nitroaniline, and after a certain amount of o-nitroaniline is enriched, the coating has a fluorescence quenching phenomenon, so the coating can not only be used for The selective enrichment and analysis of o-nitroaniline can also be used to identify whether the o-nitroaniline substances in the sample are excessive.

Description

technical field [0001] The invention relates to the field of solid-phase microextraction, more specifically, the application of fluorescent nitrogen-doped carbon quantum dots in the selective recognition of nitroaniline compounds and a solid-phase microextraction probe. Background technique [0002] Solid-phase microextraction (solid-phase microextraction, SPME) is an extraction and enrichment technology that is easy to operate and does not require a large amount of solvents. It is easy to automate and can be combined with high-efficiency separation and detection methods such as chromatography and electrophoresis. Due to its advantages of less extraction, less interference to the system, and easy automation, it has been widely used in environmental protection, food testing, drug analysis, and clinical analysis. [0003] Extraction coating is the core of SPME technology. The wide application, high sensitivity and high selectivity of SPME technology depend on the development a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00G01N21/64
CPCB82Y20/00B82Y40/00C09K11/65G01N21/6428G01N2021/6432
Inventor 欧阳钢锋刘舒芹杨升宏
Owner SUN YAT SEN UNIV
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