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Innovative Gliadin/Glutenin and Modified Potato Starch Green Composites: Chemistry, Structure, and Functionality Induced by Processing
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2016 (English)In: ACS Sustainable Chemistry and Engineering, ISSN 21680485, Vol. 4, no 12, p. 6332-6343Article in journal (Refereed) Published
Abstract [en]

In this study, we combined two wheat proteins, gliadin (Gli)/glutenin (GT), and modified potato starch (MPS) into composites using extrusion. In the Gli/GT-MPS composites, we studied the structural dynamics of proteins and starch, protein-starch interactions, protein properties, and composite morphology in relation to mechanical and barrier properties. Materials with different ratios of Gli/GT and MPS were extruded using either glycerol or glycerol-water at 110 and 130 °C. For the first time, a hierarchical hexagonal structure of Gli proteins was observed in Gli-MPS composite at both extrusion temperatures. The higher temperature (130 °C) induced a higher degree of protein cross-links, an increase in the polymer size, and formation of β-sheets compared to 110 °C. The combination of plasticizers (glycerol and water) favored a micro-structural morphology with improved gelatinization of starch, processability, as well as strength, stiffness, and extensibility of GT-MPS composites. The highest amount of the oxidized proteins was observed in the samples with the highest protein content and at high extrusion temperature. The Gli- and GT-MPS (30/70) samples showed promising oxygen barrier properties under ambient testing conditions. These findings provide in-depth information for tailoring the structural-functional relationship of the Gli/GT-potato starch composites for their promising use in designing various green materials.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2016. Vol. 4, no 12, p. 6332-6343
National Category
Composite Science and Engineering
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URN: urn:nbn:se:ri:diva-27884DOI: 10.1021/acssuschemeng.6b00892Scopus ID: 2-s2.0-85002877618OAI: oai:DiVA.org:ri-27884DiVA, id: diva2:1066237
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Available from: 2017-01-17 Created: 2017-01-17 Last updated: 2017-01-17Bibliographically approved

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