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Antimicrobial films based on polyvinyl alcohol and hydroxypropyl-cyclodextrin for the prolonged release of sodium benzoate for potential food packaging application
2nd International Conference on Food & Beverage Packaging
June 13-14, 2016 Rome, Italy
Stephanie Degoutin, Cecile Birck, Valerie Gaucher and Maryse Bacquet
University of Lille, France
Scientific Tracks Abstracts: J Food Process Technol
Abstract:
Our work concerns new poly(vinyl alcohol) (PVOH) cast films crosslinked with citric acid (CTR) and hydroxypropyl-β- cyclodextrin (HPβCD) and loaded with sodium benzoate (NaBz) as preservative agent, with different compositions of CTR, NaBz and HPβCD. The influence of HPβCD and processing parameters such as the crosslinking time on the physico-chemical and antimicrobial properties of the films were discussed. Permeability tests demonstrate that the presence of CTR and HPβCD does not modify PVOH barrier properties. Raman spectroscopy cartography shows that the NaBz distribution in the films is homogeneous, especially with HPβCD. The NaBz release in water is prolonged with HPβCD on one hand for high crosslinking times and, on the second hand, in the assays carried out at low temperature (4°C). The released quantity is increased from 40% to 70% when NaBz is included into HPβCD cavity. Antimicrobial assays were performed against S. aureus, E. coli, Candida albicans and Aspergillus niger. Without HPβCD, all films present a contact antimicrobial activity thanks to grafted CTR and the best diffusion activity was obtained for 6 wt% NaBz for the four microorganisms. With HPβCD, the antimicrobial activity by diffusion was increased with crosslinking times. These results demonstrate the high potential of PVOH/CTR/HPβCD cast films as antimicrobial food packagings.
Biography :
Stephanie Degoutin has completed her PhD in 2007 from University of Lille and Post-doctoral studies from Institute of Polymer Science and Technology of Madrid. She is working as an Assistant Professor in the group Polymer Systems Engineering of Unité des Matériaux et Transformations at the University of Lille, France. She has published 20 papers in peer-reviewed journals mainly focused on drug release.