Storage time-dependent alteration of molecular interaction–property relationships of whey protein isolate-based films and coatings
作者： Markus Schmid , Katrein Reichert , Felicia Hammann , Andreas Stäbler
DOI: 10.1007/S10853-015-8994-0
关键词:
摘要: 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 whey isolate-based film change within the first weeks after production. This indicates certain intrinsic changes take place during storage time. The overall aim this study explore time-dependent structure–property relationship WPI-based coatings. In order answer question, oxygen permeability measurements, addition solubility with different defined buffer systems combined Bradford assay were performed determine intermolecular interactions film. measurements clearly showed decreased by up 85 % 2–3 weeks tests confirmed decrease accompanied thus caused covalent non-covalent bonds between polypeptide chains storage. Based on results can be assumed cross-linking disulphide as well hydrogen predominant interaction formed days leading fast while importance relation increases time further—but slower—decrease permeability.
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