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Protein/Protein Nanocomposite Based on Whey Protein Nanofibrils in a Whey Protein Matrix
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Polymeric Materials.
RISE Bioecon Innventia AB, Drottning Kristinas Vag 61, SE-11486 Stockholm, Sweden..
SIG Combibloc, Vasagatan 7, SE-11120 Stockholm, Sweden..
SLU Swedish Agr Univ, Dept Mol Sci, Box 7015, S-75007 Uppsala, Sweden..
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2018 (English)In: ACS Sustainable Chemistry and Engineering, ISSN 2168-0485, Vol. 6, no 4, p. 5462-5469Article in journal (Refereed) Published
Abstract [en]

This article describes nanocomposite films with separately grown protein nanofibrils (PNFs) in a nonfibrillar protein matrix from the same protein starting material (whey). Tensile tests on the glycerol-plasticized films indicate an increased elastic modulus and a decreased extensibility with increasing content of PNFs, although the films are still ductile at the maximum PNF content (15 wt %). Infrared spectroscopy confirms that the strongly hydrogen-bonded beta-sheets in the PNFs are retained in the composites. The films appear with a PNF-induced undulated upper surface. It is shown that micrometer-scale spatial variations in the glycerol distribution are not the cause of these undulations. Instead, the undulations seem to be a feature of the PNF material itself. It was also shown that, apart from plasticizing the protein film, the presence of glycerol seemed to favor to some extent exfoliation of stacked beta-sheets in the proteins, as revealed by X-ray diffraction.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018. Vol. 6, no 4, p. 5462-5469
Keywords [en]
Protein fibrils, Whey, Nanocomposite, Protein structure, Mechanical properties
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-226781DOI: 10.1021/acssuschemeng.8b00330ISI: 000429285800111Scopus ID: 2-s2.0-85044728815OAI: oai:DiVA.org:kth-226781DiVA, id: diva2:1204343
Funder
Swedish Research Council Formas, 213-2014-1389
Note

QC 20180507

Available from: 2018-05-07 Created: 2018-05-07 Last updated: 2018-05-07Bibliographically approved

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