Drying temperature and relative humidity effects on wheat gluten film properties

Kayserilioglu B., Bakir U., Yilmaz L., Akkas N.

JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, vol.51, no.4, pp.964-968, 2003 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 51 Issue: 4
  • Publication Date: 2003
  • Doi Number: 10.1021/jf0205817
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.964-968
  • Keywords: wheat gluten film, drying conditions, water vapor transmission rate, solubility, mechanical properties, WATER-VAPOR PERMEABILITY, EDIBLE FILMS, MECHANICAL-PROPERTIES, BARRIER PROPERTIES, PROTEIN FILMS, PH, PLASTICIZERS, GLYCERIN, COATINGS
  • Middle East Technical University Affiliated: Yes


The mechanical and physical properties of glycerol-plasticized wheat gluten films dried at different temperatures (20, 50, and 80 degreesC) and relative humidities (35 and 70% RH) were investigated. Dispersion of wheat gluten was prepared at pH 11 in aqueous solution. Films were obtained by casting the wheat gluten suspension, followed by solvent evaporation in a temperature and relative humidity controlled chamber. Decreasing relative humidity altered most of the mechanical properties. At 35% RH, tensile strength increased when drying temperature increased. However, at 70% RH, tensile strength decreased when temperature increased. Thickness of the films decreased by increasing temperature. Hypothetical coating strength increased with increasing drying temperature at 35% FIR However, at 70% RH, a maximum value was observed at 50 degreesC. Films produced at 80 degreesC exhibited low solubility in aqueous solution. Addition of 1.5% (w/v) sodium dodecyl sulfate increased solubility of all of the films except the film dried at 50 degreesC and 70% RH. Overall, drying temperature and relative humidity affected mechanical and physical properties of the wheat gluten films. However, the effect of drying temperature was more pronounced than the effect of relative humidity.