Water‐soluble astaxanthin and silver enriched poly(vinyl alcohol)/silk fibroin crosslinking electrospun nanofiber for wound dressing

Abstract

The aim of this work is to fabricate a novel electrospun poly(vinyl alcohol) (PVA)/silk fibroin (SF) nanofibrous membrane containing astaxanthin (ASTA) and silver (Ag) nanoparticles as potential wound dressing. Since ASTA is typically liposoluble, the bioavailability could be greatly enhanced by improving its hydrophilicity. The antioxidant performance of eletrospun membrane is verified by ABTS radical scavenging assays. The beadless fibers could be fabricated at 16 kV when PVA (12, wt%) is blended with SF (6, wt%). In addition, the membrane is carefully chemically crosslinked by comparing the efforts (i.e., mechanical strength and water resistance) of glutaraldehyde dipping and vapor treatment. The morphology of the electrospun membrane is observed by scanning electron microscopy and optical microscope. The formation of Ag nanoparticles, which provides the membranes antibacterial properties, is also confirmed by energy dispersive spectroscopy and inhibition zone test. Meanwhile, the PVA/SF/ASTA/Ag compound membrane is characterized by Fourier transform infrared spectroscopy, x‐ray diffraction, thermo gravimetric analysis, differential thermal analysis, and water contact angle. The releasing of ASTA is also measured, and kinetic data are adjusted by Higuchi models. Finally, the biocompatibility is confirmed by in vitro cell staining experiments and in vivo rat models.