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Int. J. Mol. Sci. 2017, 18(12), 2658;

Tuning the Functional Properties of Bitter Vetch (Vicia ervilia) Protein Films Grafted with Spermidine

Department of Chemical Sciences, University of Naples “Federico II”, 80126 Naples, Italy
CeSMA, University of Naples “Federico II”, 80126 Naples, Italy
Department of Nutrition and Food Technology, An-Najah National University, P.O. Box 7 Nablus, Palestine
Author to whom correspondence should be addressed.
Received: 6 November 2017 / Revised: 1 December 2017 / Accepted: 7 December 2017 / Published: 8 December 2017
(This article belongs to the Special Issue Advanced Biomaterials for Food Edible Coatings)
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Bitter vetch protein films containing positively charged spermidine, alone or with low amounts of glycerol, showed high tensile strength that progressively decreased by increasing the plasticizer concentration. Accordingly, lower film elongation at break and higher Young’s module values were detected in the presence of the polyamine without or with small amounts of glycerol. These data suggest that spermidine not only acts as a plasticizer itself by ionically interacting with proteins, but that it also facilitates glycerol-dependent reduction of the intermolecular forces along the protein chains, consequently improving the film flexibility and extensibility. Thus, spermidine may be considered not only as a primary, but also as a secondary plasticizer because of its ability to enhance glycerol plasticizing performance. Such double behavior of the polyamine was confirmed by the film permeability tests, since spermidine increased the barrier properties to gases and water vapor, while glycerol emphasized this effect at low concentrations but led to its marked reversal at high concentrations. Film microscopic images also substantiated these findings, showing more compact, cohesive, and homogeneous matrices in all spermidine-containing films. View Full-Text
Keywords: edible film; food coating; plasticizer; spermidine; glycerol; Vicia ervilia edible film; food coating; plasticizer; spermidine; glycerol; Vicia ervilia

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Porta, R.; Di Pierro, P.; Roviello, V.; Sabbah, M. Tuning the Functional Properties of Bitter Vetch (Vicia ervilia) Protein Films Grafted with Spermidine. Int. J. Mol. Sci. 2017, 18, 2658.

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