In this study, PEG-b-PCL diblock copolymers were successfully synthesized by ring opening polymerization of ε-PCL with mPEG with a fixed Mw of 5000.The composition of copolymers can be well controlled by adjusting the feed weight ratios of ε-PCL to mPEG, and coincide with the theoretically predicted values. The CEO-loaded micellar NPs were successfully prepared by an oil-in-water (o/w) emulsion and solvent evaporation technique. DLS measurements show that the micellar NPs are in the range of 59 to 280 nmwith a narrow size distribution.NP size increases with the amount of CEO incorporated into the hydrophobic inner core of the PEG-b-PCL copolymers.Consequently, the obtained micelles could penetrate small capillaries without any uptake by the reticuloendothelial system. In addition, as PCL block length increases, the hydrophobic components in the amphiphilic diblock copolymer also increases. Secondly, increasing thefeed weight ratio of CEO to copolymer also produceslarger micelles and greater loading efficiencies. In the release profile of all samples, an initial burst release was observed, followed by a significantly sustained release. In the initial burst regime, an increase of hydrophobic CEO loading content inside the NPs leads to anincrease CEO release rate. In addition, the CEO release rate decreasedas PCL block lengths increased.
In this study, PEG-b-PCL diblock copolymers were successfully synthesized by ring opening polymerization of ε-PCL with mPEG with a fixed Mw of 5000.The composition of copolymers can be well controlled by adjusting the feed weight ratios of ε-PCL to mPEG, and coincide with the theoretically predicted values. The CEO-loaded micellar NPs were successfully prepared by an oil-in-water (o/w) emulsion and solvent evaporation technique. DLS measurements show that the micellar NPs are in the range of 59 to 280 nmwith a narrow size distribution.NP size increases with the amount of CEO incorporated into the hydrophobic inner core of the PEG-b-PCL copolymers.Consequently, the obtained micelles could penetrate small capillaries without any uptake by the reticuloendothelial system. In addition, as PCL block length increases, the hydrophobic components in the amphiphilic diblock copolymer also increases. Secondly, increasing thefeed weight ratio of CEO to copolymer also produceslarger micelles and greater loading efficiencies. In the release profile of all samples, an initial burst release was observed, followed by a significantly sustained release. In the initial burst regime, an increase of hydrophobic CEO loading content inside the NPs leads to anincrease CEO release rate. In addition, the CEO release rate decreasedas PCL block lengths increased.
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