Photoelectrochemical biosensor for detecting 5-hydroxymethylcytosine (5hmC) deoxyribonucleotide and preparation method thereof
A technology of deoxyribonucleotides and hydroxymethylcytosine, which is applied in the field of photoelectrochemical biosensors and its preparation, can solve the problems of expensive, cumbersome operation steps, and the need for professional operators, and achieve easy operation and high detection selectivity , The effect of improving the detection sensitivity
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[0050] (1) Preparation of polydopamine: Weigh 0.5-1 g of dopamine and dissolve it in 300-600 mL of deionized water. Under magnetic stirring, heat to 45-80°C. Then, 2-4 mL of NaOH solution with a concentration of 0.5-2 M was added. Stand for reaction for 3-8 hours. Centrifuge at 2000-5000rpm to collect the suspension. Then the suspension was centrifuged at 10000-15000 rpm to collect the precipitate. After the precipitate was washed 3-5 times with deionized water, it was vacuum-dried at 60°C.
[0051] (2) Preparation of tungsten sulfide dispersion: weigh 5-250 mg of tungsten sulfide, add it into 50 mL of deionized water, and ultrasonically disperse for 1-3 hours.
[0052] (3) Preparation of polydopamine dispersion: weigh 10-100 mg of polydopamine, add it into 20 mL of deionized water, and disperse by ultrasonic for 1-3 hours.
[0053] (4) ITO electrode pretreatment: divide the ITO conductive glass into 5×1cm 2 , then ultrasonically cleaned with ethanol / NaOH mixture (ratio ...
Embodiment 1
[0068] Embodiment 1: the preparation of polydopamine
[0069] Weigh 0.54 g of dopamine and dissolve it in 300 mL of deionized water. Under magnetic stirring, heat to 50°C. Then, 2 mL of 1 M NaOH solution was added. Stand for reaction for 5 hours. Centrifuge at 4000 rpm to collect the suspension. Then the suspension was centrifuged at 12000 rpm to collect the precipitate. The precipitate was washed three times with deionized water, and then dried under vacuum at 60°C.
Embodiment 2
[0070] Embodiment 2: the preparation of tungsten sulfide dispersion liquid
[0071] Weigh 12 mg of tungsten sulfide, add it into 3 mL of deionized water, and ultrasonically disperse for 1-3 hours.
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