A kind of autofluorescence degradable polycitrate non-viral gene carrier and its preparation method
A polycitrate and autofluorescence technology, which can be applied to other methods of inserting foreign genetic materials, recombinant DNA technology, etc., can solve problems such as poor water solubility, and achieve increased stability, simple preparation method, and reduced toxicity and immunogenicity. Effect
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Embodiment 1
[0036] 1) Preparation of POCG prepolymer: Add 6 g of citric acid and 1,8-octanediol in a molar ratio of 1:1 into a 50 mL round-bottomed flask, stir in a nitrogen atmosphere and put it in an oil bath at 160 °C Melting; after the reaction monomers citric acid and 1,8-octanediol are completely melted, the temperature is immediately lowered to 140°C, and the reaction is carried out under nitrogen atmosphere for 5 hours. The reaction product was dialyzed and purified in deionized water for 2 days, and freeze-dried for later use;
[0037] 2) Preparation of POCG-PEI 600 polymer: weighed 0.5mmol polycitrate (POCG) was stirred in DMSO to dissolve it completely, then added 1.5mmol EDC, stirred at room temperature for 30min, then added 1.5mmol NHS, stirred at room temperature 12h, then add polyethyleneimine with a molecular weight of 600Da, stir at room temperature for 12h, and dialyze and purify the product in deionized water for 2 days to remove unreacted monomers, DMSO solvent, and ca...
Embodiment 2
[0040] 1) Preparation of POCG prepolymer: Add 6 g of citric acid, 1,8-octanediol and polyethylene glycol in a molar ratio of 1:0.4:0.6 into a 50 mL round-bottomed flask, stir and put into Melt in an oil bath at 160°C; after the reaction monomers citric acid, 1,8-octanediol and polyethylene glycol are all melted, immediately lower the temperature to 140°C, and react for 5 hours under a nitrogen atmosphere. The reaction product was dialyzed and purified in deionized water for 2 days, and freeze-dried for later use;
[0041] 2) Preparation of POCG-PEI 600 polymer: Weigh 0.5mmol water-soluble polycitrate (POCG) in 15mL, 50mM, pH 4-6 MES buffer and stir to dissolve completely, then add 1.5mmol EDC , stirred at room temperature for 30min, then added 1.5mmol NHS, stirred at room temperature for 12h, then added polyethyleneimine with a molecular weight of 600Da, stirred at room temperature for 12h, and purified the product by dialysis in deionized water for 2 days to remove unreacted ...
Embodiment 3
[0044] 1) Preparation of POCG prepolymer: Add 6 g of citric acid, 1,8-octanediol and polyethylene glycol in a molar ratio of 1:0.7:0.3 into a 50 mL round-bottomed flask, stir and put into Melt in an oil bath at 160°C; after the reaction monomers citric acid, 1,8-octanediol and polyethylene glycol are all melted, immediately lower the temperature to 140°C, and react for 5 hours under a nitrogen atmosphere. The reaction product was dialyzed and purified in deionized water for 2 days, and freeze-dried for later use;
[0045] 2) Preparation of POCG-PEI 600 polymer: Weigh 0.5mmol water-soluble polycitrate (POCG) in 15mL, 50mM, pH 4-6 MES buffer and stir to dissolve completely, then add 1.5mmol EDC , stirred at room temperature for 30min, then added 1.5mmol NHS, stirred at room temperature for 12h, then added polyethyleneimine with a molecular weight of 600Da, stirred at room temperature for 12h, and purified the product by dialysis in deionized water for 2 days to remove unreacted ...
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