title: A novel globular protein electrospun fiber mat with the addition of polysilsesquioxane.
abstract: The aim of this work has been to elaborate well defined gliadin nanofibers with incorporation of inorganic molecules, such as polyhedral oligomeric silsesquioxane (POSS). Nanofibers were obtained by electrospinning processing, controlling the relevant parameters such as tip-to-collector distance, voltage and feed rate. The fiber mats were characterized by SEM, confocal images, DSC, viscosity, FTIR and conductivimetry analysis. FTIR spectra showed characteristic absorption bands related to the presence of POSS-NH(2) within the matrices. SEM micrographs showed that gliadin fibers decreased their dimensions as the amount of POSS-NH(2) increased in the spinning solution. The electrical conductivity of gliadin solutions diminished as the concentration of POSS-NH(2) was increased. Besides, confocal micrographs revealed that POSS-NH(2) might be dispersed as nanocrystals into gliadin and gluten fibers. The dimension of gluten nanofibers was also affected by the POSS-NH(2) concentration, but conversely, this dependence was not proportional to the POSS-NH(2) amount. Somehow, the interaction between gliadin and POSS-NH(2) in aqueous TFE affected the solution viscosity and, as a consequence, higher jet instabilities and thinner fiber dimensions were obtained.
authors.affiliation: Institute of Chemistry, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil. soaresr@iq.ufrgs.br
authors.forename: Rosane M D
authors.initials: RM
authors.lastname: Soares
authors.forename: Vanessa L
authors.initials: VL
authors.lastname: Patzer
authors.forename: Roland
authors.initials: R
authors.lastname: Dersch
authors.forename: Joachim
authors.initials: J
authors.lastname: Wendorff
authors.forename: Nádya Pesce
authors.initials: NP
authors.lastname: da Silveira
authors.forename: Patricia
authors.initials: P
authors.lastname: Pranke
mesh_terms: D004553:Electric Conductivity; D005903:Gliadin / Q000737:chemistry* / Q000648:ultrastructure; D005983:Glutens / Q000737:chemistry* / Q000648:ultrastructure; D008856:Microscopy, Fluorescence; D008958:Models, Molecular; D057139:Nanofibers / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods*; D017646:Organosilicon Compounds / Q000737:chemistry*; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D044366:Transition Temperature; D014783:Viscosity
chemical_list: D017646:Organosilicon Compounds; D012996:Solutions; D005983:Glutens; D005903:Gliadin