Transport and Tensile Properties of Compression-Molded Wheat Gluten Films

Abstract

Mechanical and transport properties were assessed on wheat gluten films with a glycerol content of 25-40%, prepared by compression molding for 5-15 min at temperatures between 90 and 130 degrees C. Effects of storing the films up to 24 days, in 0 and 50% relative humidity (RH), were assessed by tensile measurements. The films were analyzed with respect to methanol zero-concentration diffusivity, oxygen permeability (OP), water vapor permeability (WVP), Cobb60 and sodium dodecyl sulfate (SDS) solubility coupled with sonication. The SDS solubility and methanol diffusivity were lower at the higher molding temperature. Higher glycerol content resulted in higher OP (90-95% RH), WVP, and Cobb60 values, due to the plasticizing and hygroscopic effects. Higher glycerol contents gave a lower fracture stress, lower Young's modulus, lower fracture strain, and less strain hardening. The mold time had less effect on the mechanical properties than mold temperature and glycerol content. The fracture stress and Young's modulus increased and the fracture strain decreased with decreasing moisture content.

Biobased Materials Production from Biodiesel Residuals of Rapeseed

“…PVC plastics have until now proven very difficult to replace with more sustainable alternatives. The unique PVC-like properties of plasticized plant proteins originate from the extremely large protein polymers that plant proteins can form [4].…”

“…Most essential for determination of the quality of biomaterials are the composition of the proteins in the plant used and the possibilities of these proteins to polymerize [4][5][6]. Therefore, suitability of proteins, from different types of crops, has to be evaluated according to their usefulness for production of biomaterials for different end-uses.…”

The composition and extractability of thermo - molded wheat gluten bio-plastics

“…There was a reduction in the extractability of α-gliadin, γ-gliadin and ω-gliadin, HMW-GS and D-LMW-GS with increased molding condition thus explaining the occurrence of polymerization reaction due to the SHdisulfide interchange reactions (Sun et al 2008;Kieffer et al. Wieser, 2007;Lagrain et al, 2005;Singh and MacRitchie, 2004;Gallstedt et al, 2004;Domenek et al, 2004;Pommet et al, 2003;) while there was an increase in the extractability of B/C-LMW-GS with increased molding conditions thus explaining the oxidation and protein degradation (Veraverbeke and Delcour, 2002).…”

“…The need for environmentally friendly, renewable and biodegradable plastics is increasing due to pollution and long term health impacts of synthetic polymers (Zhang et al, 2010;Sun et al, 2008); possess suitable gas barrier properties and nutritional value (Lagrain et al, 2010;Cao et al, 2007); poor moisture barrier properties due to its hygroscopic nature; binds with water through hydrogen bridges modified by thermal and chemical treatments (Sun et al, 2008;Carvalho et al, 2008;Brauer et al, 2007;Dicharry et al, 2006;Gallstedt et al, 2004;Domenek et al, 2004;Woerdeman et al, 2004). The effect of processing on gluten network formation is determined by the SDS extractability which measures the degree of polymerization: the lower the extractability the higher the degree of polymerization (Sun et al 2008;Gallstedt et al, 2004;Domenek et al, 2004;Pommet et al, 2003;Micard et al, 2001;Cuq et al, 2000).…”

“…The effect of processing on gluten network formation is determined by the SDS extractability which measures the degree of polymerization: the lower the extractability the higher the degree of polymerization (Sun et al 2008;Gallstedt et al, 2004;Domenek et al, 2004;Pommet et al, 2003;Micard et al, 2001;Cuq et al, 2000). Besides process conditions, the presence of additives influences extractability (Lagrain et al, 2010;Sun et al, 2007;Dicharry et al, 2006;Gallstedt et al, 2004;Woerdeman et al, 2004).…”