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Synthesis method of green carbon quantum dots and application of green carbon quantum dots in detection of nitrite

A technology of carbon quantum dots and synthesis methods, applied in chemical instruments and methods, measuring devices, fluorescence/phosphorescence, etc., to achieve good anti-interference performance, mild reaction conditions, and simple operation

Active Publication Date: 2020-03-31
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the purpose of the present invention is to provide a kind of green carbon quantum dots for nitrite detection for the existing problems of fluorescent probes in nitrite detection

Method used

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  • Synthesis method of green carbon quantum dots and application of green carbon quantum dots in detection of nitrite
  • Synthesis method of green carbon quantum dots and application of green carbon quantum dots in detection of nitrite
  • Synthesis method of green carbon quantum dots and application of green carbon quantum dots in detection of nitrite

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preparation example Construction

[0060] The invention discloses a method for synthesizing green carbon quantum dots. The method specifically includes the following steps:

[0061] (1) dissolving m-aminophenol in absolute ethanol, then adding concentrated nitric acid and concentrated hydrochloric acid to obtain a mixture;

[0062] (2) The mixture is transferred to a reaction vessel, and cooled after solvothermal reaction to obtain a reactant;

[0063] (3) The reactants are sequentially eluted, concentrated, dried and ground into a solid powder to obtain the target product green carbon quantum dots.

[0064] In order to further optimize the above technical scheme, in the mixture of step (1), the volume ratio of concentrated nitric acid to concentrated hydrochloric acid is 1:3.

[0065] In order to further optimize the above technical scheme, in step (3), the reactant is eluted with a silica gel column, and the eluent is a mixed solution composed of methanol and dichloromethane with a volume ratio of 1:5.

[0...

Embodiment 1

[0073] A synthetic method of green carbon quantum dots:

[0074] (1) Dissolve 0.3 g of m-aminophenol in 30 mL of absolute ethanol, then add 15 μL of concentrated nitric acid and 45 μL of concentrated hydrochloric acid to obtain a mixture;

[0075] (2) Transfer the mixture to a reaction kettle, heat up to 80°C, and react at a constant temperature for 12 hours, then cool to room temperature to obtain a reactant;

[0076] (3) Use a rotary evaporator to concentrate the reactant suspension to about 10mL, and then use a silica gel column to elute to remove impurities. At the same time, use a rotary evaporator to evaporate the collected liquid to dryness, dissolve it with a small amount of ethanol, and pour it into a glass petri dish In the process, dry at 30°C into solid powder, that is, green carbon quantum dots are produced.

Embodiment 2

[0078] A synthetic method of green carbon quantum dots:

[0079] (1) Dissolve 0.3 g of m-aminophenol in 30 mL of absolute ethanol, then add 15 μL of concentrated nitric acid and 45 μL of concentrated hydrochloric acid to obtain a mixture;

[0080] (2) Transfer the mixture to a reaction kettle, raise the temperature to 100°C, and react at a constant temperature for 12 hours, then cool to room temperature to obtain the reactant;

[0081] (3) Use a rotary evaporator to concentrate the reactant suspension to about 10mL, and then use a silica gel column to elute to remove impurities. At the same time, use a rotary evaporator to evaporate the collected liquid to dryness, dissolve it with a small amount of ethanol, and pour it into a glass petri dish In the process, dry at 30°C into solid powder, that is, green carbon quantum dots are produced.

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Abstract

The invention discloses a synthesis method of green carbon quantum dots and application of the green carbon quantum dots in nitrite detection, and belongs to the technical field of food analysis and detection. The detection method disclosed by the invention specifically comprises the following steps: preparing green carbon quantum dots, drawing a fluorescence standard curve, pretreating a sample,and determining the concentration of nitrite in the sample. According to the invention, nitrosomercaptan is generated by utilizing the analyte nitrite and thiobarbituric acid through pi conjugation, and fluorescence quenching can be caused by the internal filtration effect between nitrosomercaptan and the green carbon quantum dots, so that the existence of nitrite is monitored. The system for detecting nitrite adopts green fluorescent carbon quantum dots, so that the detection cost is low, the reaction conditions are mild, the steps are simple, and the anti-interference performance is good. And the synthesis method of the green carbon quantum dots disclosed by the invention is simple to operate and convenient and rapid in purification, and has good industrial application potential.

Description

technical field [0001] The invention belongs to the technical field of food analysis and detection, and relates to a method strategy for detecting nitrite. More specifically, it relates to a synthesis method of green carbon quantum dots and its application in detecting nitrite. Background technique [0002] Nitrite has antiseptic, color protection and color enhancement effects, and is usually added to processed foods in the form of food additives. However, long-term consumption of food with excessive nitrite may cause dyspnea, nausea, vomiting, cancer and other diseases. Therefore, my country has strict restrictions on the content of nitrite in food. For example, the standard for the use of food additives in my country stipulates that the residual amount of nitrite in meat products should be less than 30mg / kg. In order to strictly control the abuse of nitrite, researchers have developed a variety of detection methods. There are mainly two types of methods for detecting ni...

Claims

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Application Information

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IPC IPC(8): G01N21/64C09K11/65B82Y20/00
CPCG01N21/6428G01N21/643G01N21/64C09K11/65B82Y20/00G01N2021/6432G01N2021/6417
Inventor 白艳红岳晓月李敏刘骁周子君介明沙
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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