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Method for synthesizing carbon quantum dots by using amino acid as precursor and application of carbon quantum dots in detection of metal ion concentration

A technology of carbon quantum dots and amino acids, which is applied in the fields of synthesizing carbon quantum dots with amino acids as precursors and their use in the detection of metal ion concentration, can solve the problems of interfering with the metabolism of essential metal ions, losing catalytic activity, and inactivating enzymes.

Inactive Publication Date: 2015-07-22
CHINA PHARM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] There are two main ways that heavy metals can harm the human body: one is that heavy metal ions denature or inactivate the enzyme by changing the structure of the enzyme. A small amount of heavy metal ions will not cause harm to the human body, but if the concentration of heavy metal ions in the body is too high , it will be closely combined with the active group in the protein molecule, changing the three-dimensional structure of the enzyme, or changing the charge of the active center of the enzyme, so that it will lose its proper catalytic activity; the second is that some metal ions interfere with the function of essential metal ions in the human body. Metabolism, through the replacement of other essential metal ions in the enzyme, the enzyme is inactivated, and it has a great toxic effect on organisms and the human body

Method used

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  • Method for synthesizing carbon quantum dots by using amino acid as precursor and application of carbon quantum dots in detection of metal ion concentration
  • Method for synthesizing carbon quantum dots by using amino acid as precursor and application of carbon quantum dots in detection of metal ion concentration
  • Method for synthesizing carbon quantum dots by using amino acid as precursor and application of carbon quantum dots in detection of metal ion concentration

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Dissolve 0.6g of L-threonine in 4mL of distilled water, ultrasonically form a homogeneous solution, quickly add it into a round bottom flask containing 4g of phosphorus pentoxide at 150°C, and quickly stopper the bottle After reacting for 3 minutes, the color of the solution in the round-bottomed flask was brownish black. After standing to room temperature, the obtained product was carbon quantum dots.

[0028] The above-mentioned carbon quantum dots are used to directly detect the concentration of metal ions under certain conditions: in several 4mL colorimetric tubes, a certain amount of carbon quantum dots and metal ions of different concentrations are added sequentially, diluted to the mark with a phosphate buffer solution of pH 7, The fluorescence intensity of each system was measured at a certain excitation wavelength (λex=370nm).

Embodiment 2

[0030] Dissolve 0.3g of L-alanine in 2mL of distilled water, ultrasonically form a homogeneous solution, quickly add it into a round bottom flask containing 5g of phosphorus pentoxide at 180°C, and quickly stopper the bottle After reacting for 1 min, the color of the solution in the round-bottomed flask was brownish black. After standing to room temperature, the obtained product was carbon quantum dots.

[0031] The above-mentioned carbon quantum dots are used to directly detect the concentration of metal ions under certain conditions: in several 4mL colorimetric tubes, a certain amount of carbon quantum dots and metal ions of different concentrations are added sequentially, diluted to the mark with a phosphate buffer solution of pH 7, The fluorescence intensity of each system was measured at a certain excitation wavelength (λex=370nm).

Embodiment 3

[0033] Dissolve 0.3g of L-cystine in 4mL of distilled water, ultrasonically form a homogeneous solution, quickly add it into a round bottom flask containing 3g of phosphorus pentoxide at 120°C, and quickly stopper the bottle After reacting for 2 minutes, the color of the solution in the round-bottomed flask was brownish black. After standing to room temperature, the obtained product was carbon quantum dots.

[0034]The above-mentioned carbon quantum dots are used to directly detect the concentration of metal ions under certain conditions: in several 4mL colorimetric tubes, a certain amount of carbon quantum dots and metal ions of different concentrations are added sequentially, diluted to the mark with a phosphate buffer solution of pH 7, The fluorescence intensity of each system was measured at a certain excitation wavelength (λex=370nm).

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Abstract

The invention relates to a preparation method of carbon quantum dots based on amino acid and an application of carbon quantum dots in direct detection of metal ion concentration. The method comprises the following specific steps: uniformly mixing amino acid and distilled water, rapidly adding the uniformly-mixed solution (amino acid is dissolved in distilled water) into a round-bottom flask filled with phosphoric pentoxide, rapidly plugging the bottleneck so as to obtain water-soluble carbon quantum dots, and applying the prepared carbon quantum dots in detection of metal ion concentration by a fluorescence quenching method. The synthetic method provided by the invention has a simple process, and reagents and raw materials are green and nontoxic. The prepared carbon quantum dots have characteristics of high quantum yield, strong light stability, good water-solubility and the like. Based on the quantum dots, a simple, rapid and sensitive method for metal ion quantitative detection can be established.

Description

technical field [0001] The invention relates to a preparation method for synthesizing carbon quantum dots by a bottom-up method using amino acid as a precursor and a method for directly detecting the concentration of metal ions by using the carbon quantum dots. Background technique [0002] With the development of industrial and agricultural production and the progress of social modernization, the discharge of pollutants has deteriorated the environment, among which heavy metal pollution has become one of the most serious environmental ecological pollution, directly or indirectly affecting the survival of various organisms and human beings. Health is at stake. Heavy metals are not easy to remove after being discharged into the environment, but accumulate in the environment for a long time, causing toxic and side effects to organisms and humans. Their pollution has become a major worldwide environmental problem. [0003] There are two main ways in which heavy metals can harm...

Claims

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Application Information

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IPC IPC(8): C01B31/02C09K11/65G01N21/64B82Y20/00B82Y40/00
Inventor 何华肖得力潘仁锋袁丹华李思桥
Owner CHINA PHARM UNIV
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