Journal
CARBOHYDRATE POLYMERS
Volume 129, Issue -, Pages 127-134Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2015.04.021
Keywords
Starch; Antimicrobial activity; Silver nanoparticles; Organoclay; Nanostructured films; Food packaging
Categories
Funding
- n-STeP Project - Programa Operacional Regional do Norte (ON.2) [NORTE-07-0124-FEDER-000039, PEst-C/CTM/LA0025/2013, LA 25-2013-2014, PEst-OE/EQB/LA0023/2013]
- Project BioInd - Biotechnology and Bioengineering for improved Industrial and Agro-Food processes [NORTE-07-0124-FEDER-000028]
- Programa Operacional Regional do Norte (ON.2 - 0 Novo Norte), QREN, FEDER
- Fundacao para a Ciencia e Tecnologia [SFRH/BPD/72753/2010]
- POPH-QREN
- FSE (FCT, Portugal)
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Montmorillonite modified 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. (C) 2015 Elsevier Ltd. All rights reserved.
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