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The storage modulus of PLGA-PEG-PLGA hydrogels increases with increased MelNP loading. The storage modulus of hydrogels prepared from aqueous solutions of 200 mg-mL−1 PLGA-PEG-PLGA increases proportionally with increased concentration of MelNP. This increase can be attributed to increased bridging between hydrophobic domains upon gelation. Melanin nanoparticle concentrations of ≥10 mg-mL−1 prohibited network gelation (See Text).
