Preparation and Degradation of Lysozyme-loaded Microspheres Based on Polyurethane

4th Annual International Workshop on Materials Science and Engineering

Xue, Dan^1 ; Lin, Chunling^1 ; Jiao, Xiaoni^2 ; Wu, Baoqiang^1

College of Chemistry and Chemical Engineering, Xi'An Shiyou University, Xi'an

710065, China^1

No. 4 Gas Production Plant Changqing Oil Field Company, Xi'an

710021, China^2

关键词: Accelerated degradation;    Double emulsion-solvent evaporation;    Drug loaded microsphere;    Influence of environments;    Magnetic resonance spectra;    Phosphate buffer solutions;    Poly-3-hydroxybutyrate;    Solution polymerization;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/381/1/012069/pdf
DOI  :  10.1088/1757-899X/381/1/012069

来源: IOP

【 摘 要 】

A series of block polyurethanes based on poly (3-hydroxybutyrate) (PHB-diol, Mn=6180) and poly (ethylene glycol, Mn=1500) segments were synthesized by a facil way of solution polymerization. The chemical structure was systematically characterized by 1H, nuclear magnetic resonance spectrum (NMR) and Fourier transorm infrared spectroscopy. The polyurethanes microspheres were loaded with lysozyme by double emulsion solvent evaporation and the influence of environment on degradation process was investigated. It was stated that an accelerated degradation process was carried out at pH=9 and 37°C. The cumulative release of drug-loaded microspheres was achieved about 85% in phosphate buffer solution when the degradation time reaches 20 weeks. Moreover, lower degradation of the microspheres was observed after 12 weeks in the release medium. Results showed that the microspheres exhibit different degradadable performance in different media from surface erosion to diffusion bulk collapsing.