Antimicrobial nanostructured starch based films for packaging
| Autor: | Miguel A. Cerqueira, M. Oliveira, António A. Vicente, Ana Vera Machado, Rui Miguel Martins Rodrigues, Ana S. Abreu, Arsénio de Sá |
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| Přispěvatelé: | Universidade do Minho |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
inorganic chemicals
Staphylococcus aureus Silver Materials science Polymers and Plastics Starch Scanning electron microscope Color Metal Nanoparticles Microbial Sensitivity Tests Nanostructured films Antimicrobial activity Permeability Silver nanoparticle Contact angle chemistry.chemical_compound Food packaging Anti-Infective Agents X-Ray Diffraction Elastic Modulus Candida albicans Escherichia coli Materials Chemistry Organoclay Composite material Nanocomposite Science & Technology Organic Chemistry technology industry and agriculture Water Dynamic mechanical analysis Nanostructures Oxygen Steam Montmorillonite chemistry Chemical engineering Food Clay Aluminum Silicates Silver nanoparticles |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | Montmorillonite modied with a quaternary ammonium salt C30B/starch nanocomposite (C30B/ST-NC), silver nanoparticles/starch nanocomposite (Ag-NPs/ST-NC) and both silver nanoparticles/C30B/starch nanocomposites (Ag-NPs/C30B/ST-NC) films were produced. The nanoclay (C30B) was dispersed in a starch solution using an ultrasonic probe. Different concentrations of Ag-NPs (0.3, 0.5, 0.8 and 1.0 mM) were synthesized directly in starch and in clay/starch solutions via chemical reduction method. Dispersion of C30B silicate layers and Ag-NPs in ST films characterized by X-ray and scanning electron microscopy showed that the presence of Ag-NPs enhanced clay dispersion. Color and opacity measurements, barrier properties (water vapor and oxygen permeabilities), dynamic mechanical analysis and contact angle were evaluated and related with the incorporation of C30B and Ag-NPs. Films presented antimicrobial activity against Staphylococcus aureus, Escherichia Coli and Candida Albicans without significant differences between Ag-NPs concentrations. The migration of components from the nanostructured starch films, assessed by food contact tests, was minor and under the legal limits. These results indicated that the starch films incorporated with C30B and Ag-NPs have potential to be used as packaging nanostructured material. The authors acknowledge the n-STeP Project, NORTE-07-0124-FEDER-000039, supported by the Programa Operacional Regional do Norte (ON.2), PEst-C/CTM/LA0025/2013 (Strategic Project-LA 25-2013-2014), PEst-OE/EQB/LA0023/2013 and the Project "BioInd - Biotechnology and Bioengineering for improved Industrial and Agro-Food processes", REF. NORTE-07-0124-FEDER-000028 Co-funded by the Programa Operacional Regional do Norte (ON.2 - 0 Novo Norte), QREN, FEDER. The author Miguel A. Cerqueira is recipient of a fellowship (SFRH/BPD/72753/2010, respectively), supported by Fundacao para a Ciencia e Tecnologia, POPH-QREN and FSE (FCT, Portugal). |
| Databáze: | OpenAIRE |
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