Carbon quantum dot sensor with copper ion and cysteine recognition functions, preparation method and application thereof
A technology of carbon quantum dots and cysteine, which is applied in the application field of carbon quantum dot sensors and their preparation, and detection of cysteine, which can solve the problems of poor solubility, unfavorable, and limited sensor applications, and achieve high selectivity recognition and detection, convenient post-processing, and simple synthetic route
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[0022] Example 1:
[0023] A preparation method of a carbon quantum dot sensor with dual recognition functions of copper ion and cysteine, including the following steps:
[0024] (1) Preparation of carbon quantum dots by microwave synthesis.
[0025] Place a mixed solution of 10g water, 1g citric acid, and 0.35g ethylenediamine on a microwave reactor with a power of 640W to react for 5 minutes to obtain a crude product. The crude product is dissolved in 3ml water, precipitated in 40ml ethanol solution, and dried under vacuum. , Can prepare carbon quantum dots with carboxyl groups on the surface.
[0026] (2) Surface functional modification of carbon quantum dots.
[0027] Dissolve 0.05 g of carbon quantum dots containing carboxyl groups on the surface prepared in step (1) in 2.5 ml of water, activate with 0.028 g NHS and 0.048 g EDC for 30 minutes (pH-5~7), add 0.06 g of 2-bromoethylamine in The above solution was stirred and reacted at room temperature for 2 days. After 3 times of di...
Example Embodiment
[0030] Example 2:
[0031] A preparation method of a carbon quantum dot sensor with dual recognition functions of copper ion and cysteine, including the following steps:
[0032] (1) Preparation of carbon quantum dots by microwave synthesis.
[0033] Place a mixed solution of 10g water, 1.5g citric acid, and 0.6g ethylenediamine on a microwave reactor with a power of 640W to react for 10 minutes to obtain a crude product. Dissolve the crude product in 5ml water, precipitate in 50ml ethanol solution, and then vacuum After drying, carbon quantum dots with carboxyl groups on the surface can be prepared.
[0034] (2) Surface functional modification of carbon quantum dots.
[0035] Dissolve 0.05g of carbon quantum dots containing carboxyl groups on the surface prepared in step (1) in 2.0ml of water, activate with 0.025g NHS and 0.045g EDC for 30 minutes (pH-5~7), add 0.09g of 2-bromoethylamine to The above solution was stirred and reacted at room temperature for 2 days. After 3 times of di...
Example Embodiment
[0038] Example 3:
[0039] A preparation method of a carbon quantum dot sensor with dual recognition functions of copper ion and cysteine, including the following steps:
[0040] (1) Preparation of carbon quantum dots by microwave synthesis.
[0041] Place a mixed solution of 10g water, 1.2g citric acid, and 0.5g ethylenediamine on a microwave reactor with a power of 640W to react for 8 minutes to obtain a crude product. The crude product is dissolved in 4ml water and precipitated in 30ml ethanol solution. After drying, carbon quantum dots with carboxyl groups on the surface can be prepared.
[0042] (2) Surface functional modification of carbon quantum dots.
[0043] Dissolve 0.05 g of carbon quantum dots containing carboxyl groups on the surface prepared in step (1) in 3.0 ml of water, activate it with 0.03 g NHS and 0.05 g EDC for 30 min (pH-5~7), add 0.10 g of 2-bromoethylamine to The above solution was stirred and reacted at room temperature for 2 days. After 3 times of dialysis ...
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