An environmentally friendly wound dressing based on a self-healing, extensible and compressible antibacterial hydrogel

The design of wound dressing hydrogels is of utmost importance in healthcare with desired remedial effects, self-healing ability, cell affinity, and appropriate mechanical properties, particularly for healing skin wounds; excellent wound tissue adhesiveness is imperative. Here, an ultra-tough and self-healable double-network (DN) hydrogel is designed based on salep/poly(vinyl alcohol) that is endowed with superior tissue adhesiveness and cell affinity as demonstrated for critical and burn wound healing in rats. The self-healing capability of the hydrogel is attained via hydrogen bonds and Schiff-base cross-linking between oxidized salep (OSa) and ethylene diamine-modified salep (SaHEA) chains (OSEA network). The interaction of hydroxyl groups of the poly(vinyl alcohol) (PVA) network effectively facilitates to create a stable mechanical structure and endow self-healing ability. The ensuing novel hydrogel is endowed with excellent self-healing ability, high mechanical strength (Young's modulus of up to 14 kPa; high fracture energy of up to 90 kJ m(-3); compressive stress of 400 kPa), good tissue adhesiveness (up to 48 N m(-1) adhesive strength), and superior therapeutic properties (cell viability of A375 cells >80%; remarkable healing of >60% in 14 and >98% in 21 days). The macroscopic evaluation revealed healing >80% in 14 days and 100% in 21 days that is achieved by combining both networks in a single system along with Arnebia extract and Ag nanoparticles (Ag NPs) in green media. In vitro and in vivo tests affirmed that the PVA/OSEA DN hydrogel could be an excellent candidate for skin tissue regeneration in medical applications.

Automated summary

The ultra-tough and self-healable double-network hydrogel designed based on salep/poly(vinyl alcohol) demonstrates superior tissue adhesiveness, high mechanical strength, good tissue adhesiveness, and excellent therapeutic properties for wound healing. The self-healing capability is achieved through interactions between oxidized salep and ethylene diamine-modified salep chains, as well as through the hydroxyl groups of the poly(vinyl alcohol) network. In vitro and in vivo tests confirm that this hydrogel could be a promising candidate for skin tissue regeneration in medical applications.