Hesperidin-loaded self-assembled supramolecular hydrogel based on quaternized chitosan as efficient photothermal...

The management of infected chronic wounds is one of the urgent challenges. Herein, a hesperidin (Hes)-loaded self-assembled supramolecular hydrogel based on quaternized chitosan (CQHP) has been developed as an efficient photothermal antibacterial dressing for MRSA-infected wound healing. Specifically, CQHP hydrogels fabricated through the dynamic noncovalent interactions among CM-β-CD grafted QCS, Hes, proline and Fe³⁺, exhibited injectable and self-healing behaviors, along with adhesion, antioxidant, hemostatic and protein adsorption performance, satisfying the essential feature as chronic wound dressing. Of note, superior photothermal effect generated from the Hes-Fe³⁺ has been demonstrated, which endowed the CQHP hydrogels effectively and rapidly eliminate the E. coli, S. aureus and MRSA through photothermal therapy, thereby avoiding the use of antibiotics or photothermal conversion nanomaterials in hydrogels and substantially reducing the biological toxicity. Furtherly, sustained antibacterial performance in the absence of NIR can be achieved through the inherent antibacterial activities of Hes. Importantly, the developed CQHP hydrogels significantly promoted the closure of acute full-thickness scratch wounds, and exhibited remarkable better therapeutic effect on MRSA-infected wound than commercial 3M transparent film, by efficiency and sustained antibacterial activity, reducing inflammation, enhancing angiogenesis and collagen deposition, highlighting its promising application in the MRSA-infected wound healing with high efficiency, quality and security.