Preparation method of aptamer biosensor for detecting thrombin
A nucleic acid aptamer and biosensor technology, which is applied in the field of nanomaterials and electroanalytical chemical detection, to achieve the effect of improving performance
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Embodiment 1
[0030] Nucleic acid aptamer sensors were prepared from hydrotalcite-carbon nanotube composite nanomaterials.
[0031] (1) Mix 10 mL of solution A and 10 mL of suspension B in a beaker to form suspension C.
[0032] Among them, the concentrations of cobalt nitrate and aluminum nitrate in solution A are 0.02mol / L and 0.02 mol / L respectively, and the molar ratio of cobalt nitrate and aluminum nitrate is 1:1; potassium nitrate, potassium chloride and carbon nano The concentrations of the tubes were 0.1 mol / L, 0.05 mol / L, and 0.5 mg / mL, respectively.
[0033] (2) The clean glassy carbon electrode was electrodeposited in the mixed suspension C at the potential of -0.7 V for 80 s to obtain a glassy carbon electrode modified by hydrotalcite-carbon nanotube composite nanoparticles.
[0034] (3) The hydrotalcite-carbon nanotube modified electrode was sequentially placed in 0.5 μmol / L thrombin aptamer for 12 h and soaked in 0.5 mg / mL bovine serum albumin for 40 min to prepare the nuclei...
Embodiment 2
[0036] Nucleic acid aptamer sensors were prepared from hydrotalcite-carbon nanotube composite nanomaterials.
[0037] (1) Mix 15 mL of solution A and 15 mL of suspension B in a beaker to form suspension C.
[0038] Wherein, the concentrations of cobalt nitrate and aluminum nitrate in solution A are 0.03mol / L and 0.02 mol / L respectively, and the molar ratio of cobalt nitrate and aluminum nitrate is 1.5:1; Potassium nitrate, potassium chloride and carbon nano The concentrations of the tubes were 0.2 mol / L, 0.1 mol / L, and 1.5 mg / mL, respectively.
[0039] (2) The clean glassy carbon electrode was electrodeposited in the mixed suspension C at the potential of -0.8 V for 70 s to obtain a glassy carbon electrode modified by hydrotalcite-carbon nanotube composite nanoparticles.
[0040] (3) The hydrotalcite-carbon nanotube modified electrode was sequentially placed in 1.0 μmol / L thrombin aptamer for 12 h and soaked in 1.0 mg / mL bovine serum albumin for 20 min to prepare the nucleic ...
Embodiment 3
[0042] Nucleic acid aptamer sensors were prepared from hydrotalcite-carbon nanotube composite nanomaterials.
[0043] (1) Mix 10 mL of solution A and 10 mL of suspension B in a beaker to form suspension C.
[0044] Wherein, the concentrations of cobalt nitrate and aluminum nitrate in solution A are 0.03mol / L and 0.01 mol / L respectively, and the molar ratio of cobalt nitrate and aluminum nitrate is 3:1; Potassium nitrate, potassium chloride and carbon nano The concentrations of the tubes were 0.3 mol / L, 0.1 mol / L, and 1.0 mg / mL, respectively.
[0045] (2) The clean glassy carbon electrode was electrodeposited in the mixed suspension C at the potential of -0.9 V for 60 s to obtain a glassy carbon electrode modified by hydrotalcite-carbon nanotube composite nanoparticles.
[0046](3) The hydrotalcite-carbon nanotube modified electrode was sequentially placed in 1.0 μmol / L thrombin aptamer for 12 h and soaked in 1.0 mg / mL bovine serum albumin for 40 min to prepare the nucleic aci...
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