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(A) Schematic representation of photosensitizer, pheophorbide (Pba), quenchable hyaluronic acid (HA)-based nanogels and single oxygen generation induced by Pba activation under UV irradiation. (B) Synthetic scheme of acetylated HA nanogels further conjugated with Pba. Reproduced from [59] with permission. Copyright (2010) American Chemical Society. DCC: N,N’-Dicyclohexylcarbodiimide; DMAP: 4-Dimethylaminopyridine.
