title: Electrospun gelatin nanofibers: optimization of genipin cross-linking to preserve fiber morphology after exposure to water.
abstract: The development of suitable biomimetic three-dimensional scaffolds is a fundamental requirement of tissue engineering. This paper presents the first successful attempt to obtain electrospun gelatin nanofibers cross-linked with a low toxicity agent, genipin, and able to retain the original nanofiber morphology after water exposure. The optimized procedure involves an electrospinning solution containing 30 wt.% gelatin in 60/40 acetic acid/water (v/v) and a small amount of genipin, followed by further cross-linking of the as-electrospun mats in 5% genipin solution for 7 days, rinsing in phosphate-buffered saline and then air drying at 37°C. The results of scanning electron microscopy investigations indicated that the cross-linked nanofibers were defect free and very regular and they also maintained the original morphology after exposure to water. Genipin addition to the electrospinning solution dramatically reduced the extensibility of the as-electrospun mats, which displayed further remarkable improvements in elastic modulus and stress at break after successive cross-linking up to values of about 990 and 21 MPa, respectively. The results of the preliminary in vitro tests carried out using vascular wall mesenchymal stem cells indicated good cell viability and adhesion to the gelatin scaffolds.
authors.affiliation: Department of Chemistry G. Ciamician, University of Bologna, Bologna, Italy.
authors.forename: Silvia
authors.initials: S
authors.lastname: Panzavolta
authors.forename: Michela
authors.initials: M
authors.lastname: Gioffrè
authors.forename: Maria Letizia
authors.initials: ML
authors.lastname: Focarete
authors.forename: Chiara
authors.initials: C
authors.lastname: Gualandi
authors.forename: Laura
authors.initials: L
authors.lastname: Foroni
authors.forename: Adriana
authors.initials: A
authors.lastname: Bigi
mesh_terms: D000818:Animals; D049109:Cell Proliferation / Q000187:drug effects; D003432:Cross-Linking Reagents / Q000494:pharmacology*; D005780:Gelatin / Q000737:chemistry*; D006801:Humans; D057889:Iridoid Glycosides / Q000494:pharmacology*; D039823:Iridoids; D008422:Materials Testing; D055595:Mechanical Phenomena / Q000187:drug effects; D059630:Mesenchymal Stem Cells / Q000166:cytology / Q000187:drug effects / Q000648:ultrastructure; D057139:Nanofibers / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D034421:Sus scrofa; D023822:Tissue Engineering / Q000379:methods*; D014867:Water / Q000494:pharmacology*; D014961:X-Ray Diffraction
chemical_list: D003432:Cross-Linking Reagents; D057889:Iridoid Glycosides; D039823:Iridoids; D012996:Solutions; D014867:Water; D005780:Gelatin; C007834:genipin