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Positively-charged carbon dot, and preparation method and application thereof

A positively charged, carbon dot technology, applied in the fields of botanical equipment and methods, applications, chemical instruments and methods, etc., can solve the problems of poor controllability of carbon dot size, complex preparation process, high cost, and achieve high selectivity, high The effect of simple preparation process and short reaction time

Inactive Publication Date: 2018-07-06
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have problems such as low yield, high cost, complicated preparation process, and poor controllability of the prepared carbon dot size.

Method used

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  • Positively-charged carbon dot, and preparation method and application thereof
  • Positively-charged carbon dot, and preparation method and application thereof
  • Positively-charged carbon dot, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of carbon dots by microwave wet heat method:

[0032] Weigh 1 g of polylysine, dissolve it in 6 mL of deionized water and stir it ultrasonically. Put the mixed polylysine aqueous solution in a round-bottomed flask, place it in a microwave field and heat it for 7-10 minutes. After fully reacting, stop heating and cool down to room temperature naturally. Dissolve the above liquid in 5mL deionized water, and act in the ultrasonic field for a period of time to dissolve all the obtained carbon dots in water; centrifuge to remove insoluble precipitates and large particle size aggregates, and clarify the carbon dot aqueous solution through a 0.25μm ultrafine membrane After dialysis, a light yellow clear and transparent solution was obtained. The clear carbon dot solution was placed in a freeze-dryer, and after freeze-drying, it was made into carbon dot powder. The carbon dot powder was collected and stored at 4°C for future use. The yield was 40%.

[0033] Wherein...

Embodiment 2

[0042] Preparation of carbon dots by microwave wet heat method:

[0043]Weigh 1 g of polylysine, dissolve it in 6 mL of deionized water and stir it ultrasonically. Put the mixed polylysine aqueous solution in a round-bottomed flask, place it in a microwave field and heat it for 7-10 minutes. After fully reacting, stop heating and cool down to room temperature naturally. Dissolve the above liquid in 5mL deionized water, and act in the ultrasonic field for a period of time to dissolve all the obtained carbon dots in water; centrifuge to remove insoluble precipitates and large particle size aggregates, and clarify the carbon dot aqueous solution through a 0.25μm ultrafine membrane After dialysis, a light yellow clear and transparent solution was obtained. The clear carbon dot solution was placed in a freeze dryer, and after freeze drying, carbon dot powder was made. The carbon dot powder was collected and stored at 4°C for later use. The yield was about 42%.

[0044] Wherein, th...

Embodiment 3

[0046] Preparation of carbon dots by microwave wet heat method:

[0047] Weigh 1 g of polylysine, dissolve it in 6 mL of deionized water and stir it ultrasonically. Put the mixed polylysine aqueous solution in a round-bottomed flask, place it in a microwave field and heat it for 7-10 minutes. After fully reacting, stop heating and cool down to room temperature naturally. Dissolve the above liquid in 6mL deionized water, and act in the ultrasonic field for a period of time to dissolve all the obtained carbon dots in water; centrifuge to remove insoluble precipitates and large particle size aggregates, and clarify the carbon dot aqueous solution through a 0.25μm ultrafine membrane After dialysis, a light yellow clear and transparent solution was obtained. The clear carbon dot solution was placed in a freeze-dryer, and after freeze-drying, it was made into carbon dot powder. The carbon dot powder was collected and stored at 4°C for later use. The yield was about 33%.

[0048] Wh...

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Abstract

The invention discloses a positively-charged carbon dot prepared by using polylysine as a carbon source. The preparation method comprises the following steps: weighing a certain amount of polylysine,dissolving the polylysine with a proper amount of deionized water, placing a uniformly-mixed polylysine aqueous solution in a microwave field, carrying out heating, after completion of a reaction, carrying out cooling, then adding a proper amount of deionized water, carrying out ultrasonic treatment for a period of time, carrying out centrifuging, collecting a carbon dot aqueous solution, carryingout supermicro membrane dialysis, and carrying out freeze-drying so as to prepare positively-charged carbon dot powder. The invention also discloses an application of the positively-charged carbon dot in bacteriostasis of food. The preparation method provided by the invention has the advantages of simple preparation process, high product purity, short reaction time and controllable carbon dot size; and the carbon dot with super-rich positive charges and prepared by using the preparation method provided by the invention can be used to inhibit spoilage microorganisms in the food, has high selectivity, and has great significance on and extensive application prospects in the aspects of food safety, fluorescent composite materials, etc.

Description

technical field [0001] The invention relates to a preparation method of a nanometer material, in particular to a positively charged carbon dot and its preparation method and application. Background technique [0002] In recent years, a variety of studies on carbon dots have attracted widespread attention. Carbon nanomaterials are widely used in biological detection, catalysis, energy, electronic devices, and drug loading due to their good biocompatibility and the advantages of cheap and easy-to-obtain raw materials. However, so far, carbon dots have been used for antibacterial There are few reports, and there is no report on its application in food storage and preservation. [0003] Polylysine (ε-PL) is a polymer in which the α-position carbonyl and β-position amino group of lysine are combined. Mouse experiments have confirmed that polylysine does not produce toxicity to reproductive, nervous and immune organs, embryos and fetal growth. Japan has approved ε-PL to be adde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15C09K11/65B82Y20/00B82Y40/00A01N59/00A01P1/00A23L3/358
CPCA01N59/00A23L3/358A23V2002/00B82Y20/00B82Y40/00C09K11/65A23V2200/10A23V2250/1576
Inventor 石玉刚陈杰朱云洁吴煜曾璐瑶
Owner ZHEJIANG GONGSHANG UNIVERSITY
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