Aptamer modified core-shell type composite material and preparation method and application thereof
A nucleic acid aptamer and composite material technology, applied in the fields of nanotechnology and biomedicine, can solve the problems of small specific surface area, large environmental impact of SERS effect, inability to efficiently load drugs, etc., to ensure SERS imaging and excellent biocompatibility. And target recognition performance, improve the effect of drug loading rate
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[0034] The preparation method of the nucleic acid aptamer modified core-shell type composite material of the present invention comprises the following steps:
[0035] S1: Preparation of gold nanoparticles by reducing chloroauric acid with sodium citrate;
[0036] S2: adding a mercaptolation reagent to the solution of the gold nanoparticles prepared in step S1, stirring and reacting, and centrifuging to obtain mercapto-modified gold nanoparticles;
[0037]S3: Disperse the mercapto-modified gold nanoparticles prepared in step S2 in an alcoholic solvent, add copper acetate, centrifuge after ultrasonication, take the precipitate and disperse it in an alcoholic solvent, add trimesic acid, and perform coordination by ultrasonication Reaction, centrifugal separation to obtain the core-shell composite material;
[0038] S4: Disperse the core-shell composite material prepared in step S3 in Tris-HCl buffer, add a cross-linking agent, stir and react, and centrifuge to obtain a precipita...
Embodiment 1
[0045] Nucleic acid aptamer modified core-shell composite material and its preparation method and application
[0046] The nucleic acid aptamer modified core-shell composite material of the present invention includes a gold nanoparticle core, a metal-organic framework shell and a nucleic acid aptamer, the gold nanoparticle is coated in the metal-organic framework shell, and the nucleic acid adapter grafted onto the surface of the metal-organic framework.
[0047] see figure 1 , which is a schematic diagram of the synthesis of the nucleic acid aptamer modified core-shell composite material of the present invention, the preparation method of the nucleic acid aptamer modified core-shell composite material comprises the following steps:
[0048] Step S1: Prepare gold nanoparticles by reducing chloroauric acid with sodium citrate; specifically, take 200mL of chloroauric acid solution with a mass fraction of 0.01% and add it to a 500mL three-neck flask, heat to 145°C, and keep magn...
Embodiment 2
[0054] (1) Stability of surface Raman spectra of nucleic acid aptamer-modified core-shell composites
[0055] Use a PBS solution with a pH of 7.4 to prepare a PBS solution of a nucleic acid aptamer-modified core-shell composite material with a concentration of 5 mg / L, and mix the PBS solution of the composite material with NaCl solutions of different concentrations at a volume ratio of 8:2. The concentration of NaCl is 0.01, 0.05, 0.1, 0.5 mol / L in sequence. After mixing, all were stirred at 37° C. for 2 h, and then Raman spectra were collected. see image 3 , which is the Raman spectrum of the nucleic acid aptamer-modified core-shell composite material in different concentrations of NaCl solutions. It can be seen from the figure that with the increase of NaCl concentration, the Raman spectrum of the nucleic acid aptamer-modified core-shell composite material does not change significantly, indicating that the composite material has better SERS stability in salt solution . ...
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