Preparation method of T1 strengthened nuclear magnetic resonance nanometer contrast agent
A nano-contrast agent, nuclear magnetic resonance technology, applied in the preparations, pharmaceutical formulations, emulsion delivery and other directions for in vivo experiments, can solve the problems of poor pharmacokinetics, low sensitivity, poor specificity, etc., and achieve biocompatibility Excellent, good enhancement, accurate visualization
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[0029] A preparation method of a T1-enhanced nuclear magnetic resonance nano-contrast agent, which includes selecting a Gd contrast agent as a part of the T1-enhanced MRI imaging contrast agent, realizing the dissociation and self-assembly of ferritin by adjusting the pH of the reaction solution, and then transferring the Gd contrast agent to In the ferritin nanocage, the KGDS tetrapeptide which is targeted to the activated platelet membrane glycoprotein GPIIb / IIIa was selected as the targeting ligand, and the KGDS tetrapeptide was coupled to the surface of apoferritin by chemical methods to obtain the The above-mentioned T1-enhanced nuclear magnetic resonance nano-contrast agent with activated platelet targeting.
[0030]The pH adjustment range of the reaction solution is between 2.0-7.4; the molar ratio of ferritin to KGDS tetrapeptide is 1:25-1:100; the nano-contrast agent has good biocompatibility, It has active targeting to activated platelets; the size of the nano-contra...
Embodiment 1
[0047] Step 1: Use 1M hydrochloric acid to adjust the pH value of the deferrified horse spleen ferritin aqueous solution to 2.0, the ferritin concentration is 10mg / mL, stir and incubate for 15min; take 100mg of Gd-DOTA solid, slowly add it to 2mL ferritin solution, and stir While adding, wait until the Gd-DOTA solid is completely dissolved, and mix with the apoferritin solution, stir at room temperature for 20 minutes, adjust the pH of the reaction solution to 7.4 with 1M sodium hydroxide, and continue stirring for 2 hours;
[0048] Step 2: After the reaction, centrifuge the reaction solution obtained in step (1) for 5 minutes at a speed of 12000 rpm / min to remove the protein precipitate produced during the ferritin self-assembly process;
[0049] Step 3: After centrifugation, transfer the supernatant in step (2) to a dialysis bag with a molecular weight cut-off of 8000-12000, put it into PBS buffer solution and dialyze for 24 hours, and change the dialysate every 8 hours to ob...
Embodiment 2
[0053] Step 1: Use 1M hydrochloric acid to adjust the pH value of the deferrified horse spleen ferritin aqueous solution to 2.0, the ferritin concentration is 10mg / mL, stir and incubate for 15min; take 100mg of Gd-DOTA solid, slowly add it to 2mL ferritin solution, and stir While adding, wait until the Gd-DOTA solid is completely dissolved, and mix with the apoferritin solution, stir at room temperature for 20 minutes, adjust the pH of the reaction solution to 7.4 with 1M sodium hydroxide, and continue stirring for 2 hours;
[0054] Step 2: After the reaction, centrifuge the reaction solution obtained in step (1) for 5 minutes at a speed of 12000 rpm / min to remove the protein precipitate produced during the ferritin self-assembly process;
[0055] Step 3: After centrifugation, transfer the supernatant in step (2) to a dialysis bag with a molecular weight cut-off of 8000-12000, put it into PBS buffer solution and dialyze for 24 hours, and change the dialysate every 8 hours to ob...
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