Active targeting polymer nanoparticle magnetic resonance contrast agent and preparation method thereof
A magnetic resonance contrast agent and active targeting technology, which is applied in the direction of pharmaceutical formulations and preparations for in vivo experiments, can solve the problems of tumor targeting efficiency that needs to be improved, and achieve the effect of increasing strength, good sensitivity, and improving curative effect
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Embodiment 1
[0036] Syntheses of polylysine-polyethylene glycol-polylactic acid copolymer (PLA-PEG-PLL block copolymer) (1) under argon atmosphere, the THF (tetrahydrofuran) of 15g, the KHMDS of 1.5g ( Potassium hexamethyldisilazide), 4g of EO (ethylene oxide) were added to the reaction flask, and reacted for 3 days under ice bath, and then 3.5g of D, L-LA (D, L-lactide ) into the reaction flask, after reacting for 8 hours, dropwise add 1 g of glacial acetic acid and acetone mixture with a volume ratio of 1:6 in the reaction flask, stir at room temperature for 30 min, terminate and acidolyze the product, and drop the product into 200 g of anhydrous diethyl ether Precipitation and purification treatment, H 2 N-PEG-b-PLA.
[0037] (2) take 4gH 2 Put N-PEG-b-PLA into a three-neck flask, add 20g DMF, pass in dry argon, stir, then add 1.2gLys(z)-NCA, react at room temperature for 30 hours, distill off the solvent under reduced pressure and use 20g Methyl chloride was dissolved, and then precip...
Embodiment 2
[0040] Preparation method of active targeting polymer nanoparticle magnetic resonance contrast agent:
[0041] (1) Synthesis of diethylenetriaminepentaacetic acid (DTPA) cyclic anhydride
[0042] React 0.1 mol of diethylenetriaminepentaacetic acid with 0.5 mol of acetic anhydride in 0.7 mol of anhydrous pyridine at 65°C for 24 hours, then filter, wash the solid with anhydrous ether, and dry it in vacuo to obtain a white solid diethylene triamine Aminopentaacetic acid cyclic anhydride;
[0043] (2) Synthesis of diethylenetriaminepentaacetic acid-polylysine-polyethylene glycol-polylactic acid copolymer (PLA-PEG-PLL-g-DTPA)
[0044] 1. The synthesis of PLA-PEG-PLL block copolymer adopts the method synthesis (as embodiment 1) by patent publication number CN 101565497A;
[0045] ② Place the PLA-PEG-PLL block copolymer prepared in the above ① and the diethylenetriaminepentaacetic acid cyclic anhydride prepared in step (1) in a round-bottomed flask, feed nitrogen gas, and react at ...
Embodiment 3
[0053] Preparation of Actively Targeting Polymeric Nanoparticle Magnetic Resonance Contrast Agents:
[0054] (1) Synthesis of diethylenetriaminepentaacetic acid (DTPA) cyclic anhydride
[0055] React 0.1 mol of diethylenetriaminepentaacetic acid with 0.5 mol of acetic anhydride in 0.7 mol of anhydrous pyridine at 65°C for 24 hours, then filter, wash the solid with anhydrous ether, and dry it in vacuo to obtain a white solid diethylene triamine Aminopentaacetic acid cyclic anhydride;
[0056] (2) Synthesis of diethylenetriaminepentaacetic acid-polyethylene glycol-polylactic acid copolymer (PLA-PEG-DTPA)
[0057] 1. The synthesis of PLA-PEG-PLL block copolymer adopts the method synthesis (as embodiment 1) by patent publication number CN 101565497A;
[0058] ② Place the PLA-PEG-PLL block copolymer prepared in the above ① and the diethylenetriaminepentaacetic acid cyclic anhydride prepared in step (1) in a round-bottomed flask, feed nitrogen gas, and react at room temperature fo...
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