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Active Systems Based on Silver-Montmorillonite Nanoparticles Embedded into Bio-Based Polymer Matrices for Packaging Applications

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Abstract:

Silver-montmorillonite (Ag-MMT) antimicrobial nanoparticles were obtained by allowing silver ions from nitrate solutions to replace the Na+ of natural montmorillonite and to be reduced by thermal treatment. The Ag-MMT nanoparticles were embedded in agar, zein, and poly(ε-caprolactone) polymer matrices. These nanocomposites were tested in vitro with a three-strain cocktail of Pseudomonas spp. to assess antimicrobial effectiveness. The results indicate that Ag-MMT nanoparticles embedded into agar may have antimicrobial activity against selected spoilage microorganisms. No antimicrobial effects were recorded with active zein and poly(ε-caprolactone). The water content of the polymeric matrix was the key parameter associated with antimicrobial effectiveness of this active system intended for food packaging applications.

Document Type: Research Article

Affiliations: 1: Department of Food Science, University of Foggia, Via Napoli, 25-71100 Foggia, Italy 2: Institute of Composite and Biomedical Materials, National Research Council, P. le Enrico Fermi, 1, 80055 Portici, Naples, Italy 3: Department of Food Science, University of Foggia, Via Napoli, 25-71100 Foggia, Italy, Istituto per la Ricerca e le Applicazioni Biotecnologiche per la Sicurezza e la Valorizzazione dei Prodotti Tipici e di Qualità, BIOAGROMED, Via Napoli, 52-71100 Foggia, Italy 4: Department of Food Science, University of Foggia, Via Napoli, 25-71100 Foggia, Italy, Istituto per la Ricerca e le Applicazioni Biotecnologiche per la Sicurezza e la Valorizzazione dei Prodotti Tipici e di Qualità, BIOAGROMED, Via Napoli, 52-71100 Foggia, Italy;, Email: ma.delnobile@unifg.it

Publication date: December 1, 2010

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