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Transport and tensile properties of compression-molded wheat gluten films
KTH, Superseded Departments, Polymer Technology.
KTH, Superseded Departments, Polymer Technology.
2004 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 5, no 5, 2020-2028 p.Article in journal (Refereed) Published
Abstract [en]

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 degreesC. 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), Cobb(60) 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 Cobb(60) 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.

Place, publisher, year, edition, pages
2004. Vol. 5, no 5, 2020-2028 p.
Keyword [en]
glass-transition temperature, edible wheat, rheological properties, barrier properties, size distribution, protein, glycerol, water, plasticizers, kinetics
National Category
Biochemistry and Molecular Biology
URN: urn:nbn:se:kth:diva-23755DOI: 10.1021/bm040044qISI: 000224077000055ScopusID: 2-s2.0-5044236556OAI: diva2:342454
QC 20100525 QC 20110923Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2011-09-23Bibliographically approved

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Mattozzi, AlessandroHedenqvist, Mikael S.
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