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Journal of Materials Science
Erschienen in: Journal of Materials Science 12/2015

01.06.2015 | Original Paper

Storage time-dependent alteration of molecular interaction–property relationships of whey protein isolate-based films and coatings

verfasst von: Markus Schmid, Katrein Reichert, Felicia Hammann, Andreas Stäbler

Erschienen in: Journal of Materials Science | Ausgabe 12/2015

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Abstract

Whey protein is a particularly well-studied and promising raw material to enhance functionality of packaging materials. However, in recent studies it was observed that several properties of whey protein isolate-based film change within the first weeks after film production. This indicates that certain intrinsic material changes take place during storage time. The overall aim of this study was to explore a time-dependent structure–property relationship of WPI-based coatings. In order to answer this question, time-dependent oxygen permeability measurements, and in addition solubility studies with different defined buffer systems combined with a Bradford assay were performed to determine intermolecular interactions in the film. The measurements clearly showed that oxygen permeability decreased by up to 85 % within 2–3 weeks after film production. The solubility tests confirmed that this decrease in oxygen permeability was accompanied and thus caused by different changes in covalent and non-covalent bonds between the polypeptide chains during storage. Based on the results of the solubility measurements it can be assumed that the cross-linking by disulphide bonds as well as hydrogen bonds is the predominant interaction formed during the first days of storage leading to a fast decrease in oxygen permeability while the importance of hydrogen bonds in relation to disulphide bonds increases during storage time leading to a further—but slower—decrease in oxygen permeability.
Vorheriger Artikel High-efficiency grafting of halloysite nanotubes by using π-conjugated polyfluorenes via “click” chemistry
Nächster Artikel Polyacrylamide gel synthesis, structure and optical properties of LaP3O9:Eu3+ phosphors

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Metadaten
Titel
Storage time-dependent alteration of molecular interaction–property relationships of whey protein isolate-based films and coatings
verfasst von
Markus Schmid
Katrein Reichert
Felicia Hammann
Andreas Stäbler
Publikationsdatum
01.06.2015
Verlag
Springer US
Erschienen in
Journal of Materials Science / Ausgabe 12/2015
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-015-8994-0

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