title: Study on cast membranes and electrospun nanofibers made from keratin/fibroin blends.
abstract: Keratin regenerated from wool and fibroin regenerated from silk were mixed in different proportions using formic acid as the common solvent. Both solutions were cast to obtain films and electrospun to produce nanofibers. Scanning electron microscopy investigation showed that, for all electrospun blends (except for 100% keratin where bead defects are present), the fiber diameter of the mats ranged from 900 (pure fibroin) to 160 nm (pure keratin). FTIR and DSC analysis showed that the secondary structure of the proteins was influenced by the blend ratios and the process used (casting or electrospinning). Prevalence of beta-sheet supramolecular structures was observed in the films, while proteins assembled in alpha-helix/random coil structures were observed in nanofibers. Higher solution viscosity, thinner filaments, and differences in the thermal and structural properties were observed for the 50/50 blend because of the enhanced interactions between the proteins.
authors.affiliation: National Research Council, Institute for Macromolecular Studies, 13900 Biella (BI), Italy. m.zoccola@bi.ismac.cnr.it
authors.forename: Marina
authors.initials: M
authors.lastname: Zoccola
authors.forename: Annalisa
authors.initials: A
authors.lastname: Aluigi
authors.forename: Claudia
authors.initials: C
authors.lastname: Vineis
authors.forename: Claudio
authors.initials: C
authors.lastname: Tonin
authors.forename: Franco
authors.initials: F
authors.lastname: Ferrero
authors.forename: Marco G
authors.initials: MG
authors.lastname: Piacentino
mesh_terms: D002138:Calibration; D002152:Calorimetry, Differential Scanning; D005349:Fibroins / Q000737:chemistry*; D005561:Formates / Q000737:chemistry; D006801:Humans; D007633:Keratins / Q000737:chemistry*; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods; D017433:Protein Structure, Secondary; D011506:Proteins / Q000737:chemistry; D047011:Silk / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D005561:Formates; D011506:Proteins; D047011:Silk; D012997:Solvents; C030544:formic acid; D007633:Keratins; D005349:Fibroins