Zwitterionic hydrogels promote skin wound healing

Skin traumas are among the most common health problems in the world, and are routinely treated with wound dressings such as bandages and gauze. Traditional dressings are typically made of dry cotton, which tends to adhere to the wound, causing scab formation and bacterial infections. Ideally, a dressing should accelerate wound healing while avoiding any side effects or complications. Recent studies have found that wet dressings, especially hydrogels, can provide a moist environment for wounds that mimics the in vivo environment, thus facilitating debridement of necrotic tissue, enhancing tissue regeneration, and avoiding scab formation. Zwitterionic hydrogels exhibit strong hydration, are biomimetic in nature, and show excellent anti-fouling properties; their resulting high water content, excellent biocompatibility, and negligible interactions with proteins and cells make them ideal wet wound dressings. In this work, we demonstrated that zwitterionic hydrogels, especially poly-carboxybetaine (PCB) hydrogels, can efficiently promote skin wound healing. Skin wounds treated with zwitterionic hydrogels healed significantly better than those treated with PHEMA hydrogels and the commercial product DuoDerm. Moreover, these zwitterionic hydrogels can be easily coated on cotton gauze or bandage pads for easy handling and application. The findings in this work hold great promise for the development of next-generation wound dressings to improve healthcare.