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Structural changes of gluten/glycerol plastics under dry and moist conditions and during tensile tests

Yu, Shun and Chen, Fei and Wu, Qiong and Roth, Stephan V. and Brüning, Karsten and Schneider, Konrad and Kuktaite, Ramune and Hedenqvist, Mikael S. (2016). Structural changes of gluten/glycerol plastics under dry and moist conditions and during tensile tests. ACS sustainable chemistry & engineering. 4:6, 3388-3397
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Official URL: http://dx.doi.org/10.1021/acssuschemeng.6b00465

Abstract

The structures of wheat gluten-based materials are greatly influenced by plasticizer content, moisture content, and external mechanical loading. In this study, the effects of moisture on the structure of wheat gluten (WG) plasticized by glycerol were investigated by using in situ small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering (WAXS), mechanical tensile testing, and thermal analyses. The materials were processed with additives of ammonium hydroxide/salicylic acid or urea and conditioned at 0, 50, and 100% relative humidity (RH). In general, water showed similar effects on the WG structure and mechanical properties regardless of the type of additive. It was observed that the known hexagonal close-packed (HCP) structure in WG was present mainly under moist conditions and swelled with an increase in water content. The absorbed water molecules hydrated the protein chains at 50% RH and further led to the formation of a separate water/glycerol phase at 100% RH. An interesting feature was observed by in situ SAXS during tensile deformation; both the HCP structure and other protein aggregates packed more densely in both the tensile and transverse directions. It is interpreted as follows: "randomly oriented" chains were drawn out and stretched in the tensile direction, which squeezes the self-assembled structures together, similar to "tightening a knot".

Authors/Creators:Yu, Shun and Chen, Fei and Wu, Qiong and Roth, Stephan V. and Brüning, Karsten and Schneider, Konrad and Kuktaite, Ramune and Hedenqvist, Mikael S.
Title:Structural changes of gluten/glycerol plastics under dry and moist conditions and during tensile tests
Series/Journal:ACS sustainable chemistry & engineering (2168-0485)
Year of publishing :2016
Volume:4
Number:6
Page range:3388-3397
Number of Pages:10
Publisher:American Chemical Society
ISSN:2168-0485
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Accepted version
Full Text Status:Public
Agris subject categories.:X Agricola extesions > X50 Chemistry
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
Keywords:Wheat gluten, Relative humidity, X-ray scattering, Hexagonal close packed structure, Hydration
URN:NBN:urn:nbn:se:slu:epsilon-e-4207
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-4207
Additional ID:
Type of IDID
Web of Science (WoS)000377425900053
ID Code:14296
Faculty:LTV - Fakulteten för landskapsarkitektur, trädgårds- och växtproduktionsvetenskap
Department:(LTJ, LTV) > Department of Plant Breeding (from 130101)
Deposited By: SLUpub Connector
Deposited On:31 May 2017 08:18
Metadata Last Modified:31 May 2017 08:18

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