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Summary of different types of hydrogels and nanoparticles.
| Hydrogels | Nanoparticles (NPs) | |
| Natural | Synthetic | – |
| Alginate | Poly-lactide-co-glycolide (PLGA) | Liposomes |
| Collagen | Polyethylene glycol (PEG) | Polymeric NPs |
| Chitosan | Polylactide (PLA) | Inorganic NPs |
| Hyaluronic acid (HA) | Polycaprolactone (PCL) | Other hybrid NPs |
| Silk | Polyacrylamide (PAM) | – |
