Preparation method for synthesizing silver nanocluster electrochemical biosensor based on DNA signal amplification technique and application of electrochemical biosensor
A technology of biosensors and silver nanoclusters, which is applied in the field of preparation of electrochemical biosensors, can solve the problems of undisclosed electrochemical sensors, and achieve the effects of accelerating electron transfer, improving detection sensitivity, and high-sensitivity detection
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Embodiment 1
[0041] A method for preparing an electrochemical biosensor based on DNA signal amplification technology to synthesize silver nanoclusters, the specific steps are as follows:
[0042] (1) Dispersion of graphene
[0043] Dissolve 8.0 mg of graphene in 8.0 mL of acetic acid buffer solution with a concentration of 0.2 M at pH=5.0~6.0, and ultrasonically disperse in an ultrasonic cleaner for 3.5 h to obtain a graphene dispersion;
[0044] (2) Preparation of silver nanoclusters (DNA-AgNCs)
[0045] a. Pipette 2.0 μL double distilled water, 8.0 μL DNA solution with a concentration of 12.0 μM, 1.5 μL dCTP solution with a concentration of 12.0mM, 1.5 μL 5×TdT reaction buffer and 0.3 μL TdT with a concentration of 15.0 U / μL Put the solution in a PCR tube, shake it for 3.5 min to mix the reagents evenly, then place it in a constant temperature water bath at 37 °C for 2.5 h, then place the PCR tube in a water bath at 75 °C for 15 min to terminate the reaction, and obtain the extended DNA...
Embodiment 2
[0051] A method for preparing an electrochemical biosensor based on DNA signal amplification technology to synthesize silver nanoclusters, the specific steps are as follows:
[0052] (1) Dispersion of graphene
[0053] Dissolve 5.0 mg of graphene in 10.0 mL of acetic acid buffer solution with a concentration of 0.1 M at pH=5.0~6.0, and ultrasonically disperse in an ultrasonic cleaner for 2 h to obtain a graphene dispersion;
[0054] (2) Preparation of silver nanoclusters (DNA-AgNCs)
[0055] a. Pipette 1.0 μL double-distilled water, 5.0 μL DNA solution with a concentration of 15.0 μM, 1.0 μL dCTP solution with a concentration of 15.0 mM, 1.0 μL 5×TdT reaction buffer and 0.4 μL TdT with a concentration of 10.0 U / μL Put the solution in a PCR tube, shake it for 2 minutes to mix the reagents evenly, then place it in a constant temperature water bath at 35°C for 3 hours, then place the PCR tube in a water bath at 70°C for 20 minutes to terminate the reaction, and obtain the extend...
Embodiment 3
[0061] A method for preparing an electrochemical biosensor based on DNA signal amplification technology to synthesize silver nanoclusters, the specific steps are as follows:
[0062] (1) Dispersion of graphene
[0063] Dissolve 10.0 mg of graphene in 5.0 mL of acetic acid buffer solution with a concentration of 0.3 M at pH=5.0~6.0, and ultrasonically disperse in an ultrasonic cleaner for 5 h to obtain a graphene dispersion;
[0064] (2) Preparation of silver nanoclusters (DNA-AgNCs)
[0065] a. Pipette 3.0 μL double distilled water, 10.0 μL DNA solution with a concentration of 15.0 μM, 1.0 μL dCTP solution with a concentration of 15.0 mM, 2.0 μL 5×TdT reaction buffer and 0.2 μL TdT with a concentration of 20.0 U / μL Put the solution in a PCR tube, shake it for 5 minutes to mix the reagents evenly, then place it in a constant temperature water bath at 38°C for 2 hours, then place the PCR tube in a water bath at 80°C for 10 minutes to terminate the reaction, and obtain the exten...
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