title: Mechanical and water barrier properties of glutenin films influenced by storage time.
abstract: The goal of this work was to study the effect of storage time on the functional properties of glutenin films plasticized with selected hydrophilic low molecular weight compounds: glycerol (GL), triethanolamine (TEA), and sorbitol (S). Glutenins were extracted from wheat gluten, and films were cast from film-forming solutions. The glutenin-based films were homogeneous, flexible, translucent, and easy to handle. Films were stored in an environmental chamber at 50 +/- 5% realtive humidity and 23 +/- 2 degrees C. Optical, mechanical, and water vapor permeability properties were monitored at regular intervals for 16 weeks. Films plasticized with GL and TEA had similar mechanical and water vapor barrier properties during the first few days of fabrication. Films plasticized with S were stronger, with better water vapor barrier properties. Mechanical and water vapor permeability properties of films plasticized with GL changed dramatically over time, whereas the properties of films plasticized with TEA and S remained stable during storage. Color properties of films plasticized with GL, TEA, and S did not change within the time period studied.
authors.affiliation: School of Packaging, Michigan State University, East Lansing, Michigan 48824, USA. phernan@iata.csic.es
authors.forename: Pilar
authors.initials: P
authors.lastname: Hernández-Muñoz
authors.forename: Amparo
authors.initials: A
authors.lastname: López-Rubio
authors.forename: Valeria
authors.initials: V
authors.lastname: Del-Valle
authors.forename: Eva
authors.initials: E
authors.lastname: Almenar
authors.forename: Rafael
authors.initials: R
authors.lastname: Gavara
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D018857:Food Packaging; D005983:Glutens / Q000031:analogs & derivatives*; D006813:Humidity; D019563:Mechanics; D010539:Permeability; D010968:Plasticizers; D013718:Tensile Strength; D013997:Time Factors; D014867:Water
chemical_list: D010968:Plasticizers; D014867:Water; D005983:Glutens; C037302:glutenin