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A Stiff Injectable Biodegradable Elastomer. | LitMetric
Injectable materials often have shortcomings in mechanical and drug-eluting properties that are attributable to their high water contents. A water-free, liquid four-armed PEG modified with dopamine end groups is described which changed from liquid to elastic solid by reaction with a small volume of Fe solution. The elastic modulus and degradation times increased with increasing Fe concentrations. Both the free base and the water-soluble form of lidocaine could be dissolved in the PEG-dopamine and released in a sustained manner from the cross-linked matrix. PEG-dopamine was retained in the subcutaneous space in vivo for up to 3 weeks with minimal inflammation. This material's tailorable mechanical properties, biocompatibility, ability to incorporate hydrophilic and hydrophobic drugs and release them slowly are desirable traits for drug delivery and other biomedical applications.
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