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Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging

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Active systems based on silver-montmorillonite nanoparticles embedded into bio-based polymer matrices for packaging

A L Incoronato¹, G G Buonocore, A Conte

¹Department of Food Science, University of Foggia, Via Napoli, 25-71100 Foggia, Italy.

Journal of Food Protection

|January 12, 2011

Summary

Silver-montmorillonite (Ag-MMT) nanoparticles show antimicrobial activity in agar for food packaging. Effectiveness depends on the water content of the polymer matrix, with zein and poly(ε-caprolactone) showing no effect.

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Area of Science:

Materials Science
Nanotechnology
Food Science

Background:

Silver-montmorillonite (Ag-MMT) nanoparticles are synthesized by ion exchange and thermal reduction.
Antimicrobial properties of nanomaterials are explored for active food packaging.

Purpose of the Study:

To evaluate the antimicrobial effectiveness of Ag-MMT nanoparticles embedded in different polymer matrices for food packaging.
To identify factors influencing the antimicrobial activity of Ag-MMT nanocomposites.

Main Methods:

Ag-MMT nanoparticles were prepared and characterized.
Nanoparticles were incorporated into agar, zein, and poly(ε-caprolactone) matrices.
In vitro antimicrobial assays were performed using a Pseudomonas spp. cocktail.

Main Results:

Ag-MMT nanoparticles in agar exhibited antimicrobial activity against spoilage microorganisms.
No antimicrobial effects were observed when Ag-MMT was embedded in zein or poly(ε-caprolactone).
Water content of the polymer matrix was identified as a critical factor for antimicrobial efficacy.

Conclusions:

Ag-MMT shows potential as an antimicrobial agent in agar-based food packaging.
The matrix composition, particularly water content, significantly impacts the performance of Ag-MMT nanocomposites.
Further research is needed to optimize Ag-MMT systems for broader food packaging applications.