Air-Spun Silk-Based Micro-/Nanofibers and Thin Films for Drug Delivery

Abstract

Micro-/nanofibers have shown high promise as drug delivery vehicles due to their high porosity and surface-area-to-volume ratio. The current study utilizes air-spraying, a novel fiber fabrication technique, to create silk micro-/nanofibers without the need for a high voltage power source. Air-spraying was used to create silk fibrous mats embedded with several model drugs with high efficiency. In order to compare the effect of biomaterial geometry on the release of the model drugs, silk films were also created and characterized. Fourier-transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and a drug release study were performed on both fiber and film samples to study how the model drugs interact with the protein structure. FTIR analysis showed that while drugs could interact with the protein structure of porous silk fibers, they could not interact with the flat geometry of silk films. As a result, fibers could protect select model drugs from thermal degradation and slow their release from the fiber network with more control than the silk films. A trend was also revealed where hydrophobic drugs were better protected and had a slower release than hydrophilic drugs. The results suggest that the physical and chemical properties of drugs and protein-based biomaterials are important for creating drug delivery vehicles with tailored release profiles and that fibers provide better tunability than films do.

Advances in Natural Polymeric Nanoparticles for the Drug Delivery

“…The β-sheet structure helped to form the hydrogel network and payload efficiency was enhanced using the carbon nano tubes [37]. Air spun nanofibers for drug delivery [38], temperature-responsive poly (N-isopropylacrylamide) (PNIPAM) hydrogel and SF scaffold microcarriers for controlled and sustained drug release [39], silk based embolic material a potential next-generation multifunctional embolic agent including nivolumab labeled with albumin was delivered to treat vascular disorders, including malignancies, as well as achieve embolization [40]. Its utilization has been explored nevertheless in all possible directions for drug delivery.…”