Biomimetic dopamine polymerization drug-loading nanometer transmitting and releasing system and preparation method thereof
A drug-loading nanometer and dopamine technology, applied in pharmaceutical formulations, drug combinations, anti-tumor drugs, etc., can solve the problems of accelerated blood clearance, shortened blood half-life, unable to achieve efficient drug delivery, etc., to increase the load capacity and reduce toxic side effects , Guarantee the effect of efficient release
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[0045]Example 1
[0046]Synthesis of dopamine polymerized drug-loaded nanoparticles containing doxorubicin
[0047]Prepare a 10 mg / mL dopamine solution with pure water and a 20 mg / mL adriamycin solution with DMSO. According to the mass ratio of dopamine and adriamycin of 1:0.5, the dopamine solution and the adriamycin solution were added dropwise to the Tris-HCl buffer with pH=8.5, so that the final concentration of dopamine was 0.2 mg / mL. After the reaction was stirred for 24 hours in the dark under the condition of oxygen ventilation at room temperature, it was placed in a 3500Da dialysis bag, placed in pure water, and dialyzed against light to remove the unencapsulated doxorubicin, and the dopamine polymer carrier containing dopamine was obtained. Drug nanoparticles. Measured by fluorescence spectrophotometry, the drug loading of the nanoparticles was 32.3%, and the encapsulation efficiency was 95.7%.
Example Embodiment
[0048]Example 2
[0049]Synthesis of dopamine polymerized drug-loaded nanoparticles containing doxorubicin
[0050]Prepare the dopamine solution and doxorubicin solution according to Example 1. According to the mass ratio of dopamine and doxorubicin at 1:1, add the dopamine solution and doxorubicin solution dropwise to the Tris-HCl buffer with pH=8.5. Make the final concentration of dopamine 0.2mg / mL. After the reaction was stirred for 24 hours in the dark under the condition of oxygen ventilation at room temperature, it was placed in a 3500Da dialysis bag, placed in pure water, and dialyzed against light to remove the unencapsulated doxorubicin, and the dopamine polymer carrier containing dopamine was obtained. Drug nanoparticles. Measured by fluorescence spectrophotometry, the drug loading of the nanoparticles was 47.6%, and the encapsulation efficiency was 90.9%.
Example Embodiment
[0056]Example 3
[0057]Synthesis of dopamine polymerized drug-loaded nanoparticles containing doxorubicin
[0058]Prepare the dopamine solution and doxorubicin solution according to Example 1. According to the mass ratio of dopamine and doxorubicin at 1:2, add the dopamine solution and doxorubicin solution dropwise to the Tris-HCl buffer with pH=8.5. Make the final concentration of dopamine 0.2mg / mL. After the reaction was stirred for 24 hours in the dark under the condition of oxygen ventilation at room temperature, it was placed in a 3500Da dialysis bag, placed in pure water, and dialyzed against light to remove the unencapsulated doxorubicin, and the dopamine polymer carrier containing dopamine was obtained. Drug nanoparticles. Measured by fluorescence spectrophotometry, the drug loading of the nanoparticles was 63.6%, and the encapsulation efficiency was 87.4%.
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