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Research article - Peer-reviewed, 2015

Nanostructural Morphology of Plasticized Wheat Gluten and Modified Potato Starch Composites: Relationship to Mechanical and Barrier Properties

Muneer, Faraz; Andersson, Mariette; Koch, Kristine; Menzel, Carolin; Hedenqvist, Mikael S.; Gällstedt, Mikael; Plivelic, Tomas S.; Kuktaite, Ramune

Abstract

In the present study, we were able to produce composites of wheat gluten (WG) protein and a novel genetically modified potato starch (MPS) with attractive mechanical and gas barrier properties using extrusion. Characterization of the MPS revealed an altered chain length distribution of the amylopectin fraction and slightly increased amylose content compared to wild type potato starch. WG and MPS of different ratios plasticized with either glycerol or glycerol and water were extruded at 110 and 130 degrees C. The nanomorphology of the composites showed the MPS having semicrystalline structure of a characteristic lamellar arrangement with an approximately 100 A period observed by small-angle X-ray scattering and a B-type crystal Structure observed by wide-angle X-ray scattering analysis. WG has a structure resembling the hexagonal macromolecular arrangement as reported previously in WG films. A larger amount of beta-sheets was observed in the samples 70/30 and 30/70 WG-MPS processed at 130 degrees C with 45% glycerol. Highly polymerized WG protein was found in the samples processed at 130 degrees C versus 110 degrees C. Also, greater amounts of WG protein in the blend resulted in greater extensibility (110 degrees C) and a decrease in both E-modulus and maximum stress at 110 and 130 degrees C, respectively. Under ambient conditions the WG-MPS composite (70/30) with 45% glycerol showed excellent gas barrier properties to be further explored in multilayer film packaging applications.

Keywords

wheat gluten, potato starch, bio-based composites

Published in

Biomacromolecules
2015, volume: 16, number: 3, pages: 695-705

Authors' information

Swedish University of Agricultural Sciences, Department of Plant Breeding
Swedish University of Agricultural Sciences, Department of Plant Breeding
Swedish University of Agricultural Sciences, Department of Food Science
Menzel, Carolin
Swedish University of Agricultural Sciences, Department of Food Science
Hedenqvist, Mikael S.
Royal Institute of Technology (KTH)
Gällstedt, Mikael
Innventia
Plivelic, Tomas S.
Lund University
Swedish University of Agricultural Sciences, Department of Plant Breeding

Associated SLU-program

Future Agriculture (until Jan 2017)

UKÄ Subject classification

Biochemistry and Molecular Biology
Plant Biotechnology
Materials Chemistry

Publication Identifiers

DOI: https://doi.org/10.1021/bm5017496

URI (permanent link to this page)

https://res.slu.se/id/publ/66755