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Coatings 2017, 7(10), 177; https://doi.org/10.3390/coatings7100177

Antimicrobial Films Based on Chitosan and Methylcellulose Containing Natamycin for Active Packaging Applications

1
Department of Analytical Chemistry, Nutrition, and Food Science, Faculty of Pharmacy, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain
2
Department of Veterinary Medicine and Animal Production, University of Naples, 80137 Naples, Italy
*
Author to whom correspondence should be addressed.
Academic Editors: Sami Rtimi and Stefanos Giannakis
Received: 12 September 2017 / Revised: 6 October 2017 / Accepted: 14 October 2017 / Published: 24 October 2017
(This article belongs to the Special Issue Advances in Antimicrobial Coatings)
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Abstract

Biodegradable polymers are gaining interest as antimicrobial carriers in active packaging. In the present study, two active films based on chitosan (1.5% w/v) and methylcellulose (3% w/v) enriched with natamycin were prepared by casting. The antimicrobial’s release behavior was evaluated by immersion of the films in 95% ethanol (v/v) at different temperatures. The natamycin content in the food simulant was determined by reversed-high performance liquid chromatography with diode-array detection (HPLC-DAD). The apparent diffusion (DP) and partition (KP/S) coefficients were calculated using a mathematical model based on Fick’s Second Law. Results showed that the release of natamycin from chitosan based film (DP = 3.61 × 10−13 cm2/s) was slower, when compared with methylcellulose film (DP = 3.20 × 10−8 cm2/s) at the same temperature (p < 0.05). To evaluate the antimicrobial efficiency of active films, cheese samples were completely covered with the films, stored at 20 °C for 7 days, and then analyzed for moulds and yeasts. Microbiological analyses showed a significant reduction in yeasts and moulds (7.91 log CFU/g) in samples treated with chitosan active films (p < 0.05). The good compatibility of natamycin with chitosan, the low Dp, and antimicrobial properties suggested that the film could be favorably used in antimicrobial packagings. View Full-Text
Keywords: active packaging; chitosan; methylcellulose; natamycin active packaging; chitosan; methylcellulose; natamycin
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Santonicola, S.; García Ibarra, V.; Sendón, R.; Mercogliano, R.; Rodríguez-Bernaldo de Quirós, A. Antimicrobial Films Based on Chitosan and Methylcellulose Containing Natamycin for Active Packaging Applications. Coatings 2017, 7, 177.

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