Drying temperature and relative humidity effects on wheat gluten film properties

Date

2003-02-12

Author

Kayserilioglu, BS
Bakir, U
Yılmaz, Levent
Akkas, N

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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.

Subject Keywords

General Chemistry, General Agricultural and Biological Sciences

URI

https://hdl.handle.net/11511/37558

Collections

Department of Chemical Engineering, Article