title: Drying temperature effect on water vapor permeability and mechanical properties of whey protein-lipid emulsion films.
abstract: The water vapor permeability (WVP) and mechanical properties of whey protein isolate (WPI) and WPI-lipid emulsion films dried at different conditions were investigated. As drying temperature increased, WVPs decreased significantly. Significantly lower WVP was observed for emulsion films compared to WPI films. WPI-Beeswax (BW) and WPI-anhydrous milkfat fraction emulsion films dried at 80 degrees C and 40% RH gave the lowest WVP compared to 25 degrees C, 40% RH and 40 degrees C, 40% RH. A large drop in WVP of WPI-BW emulsion films was observed at 20% BW content. The decrease in WVP for emulsion films as drying temperature increased could be due to change in the lipid crystalline morphology and/or lipid distribution within the matrix. Mechanical properties of WPI and WPI-lipid emulsion films, on the other hand, were not modified by drying conditions.
authors.affiliation: Department of Food Science and Technology, University of California, Davis, Davis, California 95616, USA. Helena.Vuorinen@uku.fi
authors.forename: M B
authors.initials: MB
authors.lastname: Perez-Gago
authors.forename: J M
authors.initials: JM
authors.lastname: Krochta
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003681:Dehydration; D004655:Emulsions; D005511:Food Handling / Q000379:methods*; D008055:Lipids; D008894:Milk Proteins; D010539:Permeability; D013696:Temperature; D014867:Water; D000067816:Whey Proteins
chemical_list: D004655:Emulsions; D008055:Lipids; D008894:Milk Proteins; D000067816:Whey Proteins; D014867:Water