Liver targeting cationic polymer as well as preparation method and application thereof
A cationic polymer, ionic polymer technology, applied in the field of biomedicine, to achieve the effects of inhibiting proliferation, high anticancer activity, and enhancing stability
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[0043] Example 1 Preparation of liver-targeting cationic polymer PuPGEA and liver-targeting nanocomposite
[0044] The preparation method of liver targeting cationic polymer, the steps are as follows:
[0045] (1) After completely dissolving the pullulan (Pullulan, 3 g) and 4-dimethylaminopyridine (DMAP, 0.15 g) in anhydrous dimethylformamide (DMF, 30 mL), in an ice bath and stirring A solution of 2-bromoisobutyryl bromide (BIBB, 0.148 mL) in DMF (0.6 mL) was added under conditions. Then the system was transferred to room temperature for reaction for 24 hours, and then bromoisobutyl functionalized pullulan (PuBr) was obtained as a polymerization initiator through dialysis and freeze-drying.
[0046] (2) 80 mg of PuBr was put into anhydrous dimethyl sulfoxide (DMSO, 2 mL), and glycidyl methacrylate (GMA, 0.8 mL), cuprous bromide (CuBr) and 2,2'- Bipyridine (Bipy) was added to the above DMSO at a molar ratio of 100:1:3, and was sealed by bubbling nitrogen for 20 minutes, then ...
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[0058] Example 2 Preparation of liver-targeting cationic polymer PuPGEA and liver-targeting nanocomposite
[0059] The preparation method of liver targeting cationic polymer, the steps are as follows:
[0060] (1) After completely dissolving pullulan (Pullulan, 2 g) and 4-dimethylaminopyridine (DMAP, 0.438 g) in anhydrous dimethylformamide (DMF, 20 mL), in an ice bath and stirring A solution of 2-bromoisobutyryl bromide (BIBB, 0.19 mL) in DMF (1.0 mL) was added under conditions. Then the system was transferred to room temperature for reaction for 24 hours, and then bromoisobutyl functionalized pullulan (PuBr) was obtained as a polymerization initiator through dialysis and freeze-drying.
[0061] (2) 30 mg of PuBr was put into anhydrous dimethyl sulfoxide (DMSO, 1 mL), glycidyl methacrylate (GMA, 0.5 mL), cuprous bromide (CuBr) and 2,2'- Bipy was added to the above-mentioned DMSO at a molar ratio of 80:1:3, and then sealed with nitrogen by bubbling for 20 minutes, and then re...
Example Embodiment
[0066] Example 3 Preparation of liver-targeting cationic polymer PuPGEA and liver-targeting nanocomposite
[0067] The preparation method of liver targeting cationic polymer, the steps are as follows:
[0068] (1) After completely dissolving pullulan (Pullulan, 4 g) and 4-dimethylaminopyridine (DMAP, 576 mg) in anhydrous dimethylformamide (DMF, 40 mL), under the conditions of ice bath and stirring A solution of 2-bromoisobutyryl bromide (BIBB, 0.54 mL) in DMF (5 mL) was added. Then the system was transferred to room temperature for reaction for 24 hours, and then bromoisobutyl functionalized pullulan (PuBr) was obtained as a polymerization initiator through dialysis and freeze-drying.
[0069] (2) 0.1 g of PuBr was put into anhydrous dimethyl sulfoxide (DMSO, 3 mL), glycidyl methacrylate (GMA, 0.9 mL), cuprous bromide (CuBr) and 2,2' - Bipy was added to the above-mentioned DMSO at a molar ratio of 120:1:3, sealed with nitrogen gas by bubbling for 20 minutes, and then reacted...
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