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Foods 2016, 5(1), 3; doi:10.3390/foods5010003

Physical and Antimicrobial Properties of Starch-PVA Blend Films as Affected by the Incorporation of Natural Antimicrobial Agents

Institute of Food Engineering for the Development, Polytechnic University of Valencia, Camino de Vera s/n, 48022 Valencia, Spain
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Author to whom correspondence should be addressed.
Academic Editor: Sheryl Barringer
Received: 9 August 2015 / Revised: 27 November 2015 / Accepted: 21 December 2015 / Published: 26 December 2015
(This article belongs to the Special Issue Food Coatings)
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Abstract

In this work, active films based on starch and PVA (S:PVA ratio of 2:1) were developed by incorporating neem (NO) and oregano essential oils (OEO). First, a screening of the antifungal effectiveness of different natural extracts (echinacea, horsetail extract, liquid smoke and neem seed oil) against two fungus (P. expansum and A. niger) was carried out. The effect of NO and OEO incorporation on the films’ physical and antimicrobial properties was analyzed. Only composite films containing OEO exhibited antibacterial and antifungal activity. Antibacterial activity occurred at low OEO concentration (6.7%), while antifungal effect required higher doses of OEO in the films. Incorporation of oils did not notably affect the water sorption capacity and water vapor barrier properties of S-PVA films, but reduced their transparency and gloss, especially at the highest concentrations. The mechanical response of the S-PVA films was also negatively affected by oil incorporation but this was only relevant at the highest oil ratio (22%). S-PVA films with 6.7% of OEO exhibited the best physical properties, without significant differences with respect to the S-PVA matrix, while exhibiting antibacterial activity. Thus, the use of OEO as a natural antimicrobial incorporated into starch-PVA films represents a good and novel alternative in food packaging applications. View Full-Text
Keywords: oregano essential oil; neem oil; water vapour permeability; mechanical properties; E. coli; L. innocua; A. niger; P. expansum oregano essential oil; neem oil; water vapour permeability; mechanical properties; E. coli; L. innocua; A. niger; P. expansum
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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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MDPI and ACS Style

Cano, A.; Cháfer, M.; Chiralt, A.; González-Martínez, C. Physical and Antimicrobial Properties of Starch-PVA Blend Films as Affected by the Incorporation of Natural Antimicrobial Agents. Foods 2016, 5, 3.

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