Investigating physical, mechanical and anti-bacterial properties of active LDPE films incorporating nano-clays modified with nano-silver particles

Document Type : Research Article

Authors

1 Department of Food Science, College of Agriculture, University of Tabriz, Tabriz

2 Faculty of Chemical & Petroleum Engineering, University of Tabriz, Tabriz

Abstract

Antibacterial efficiency of LDPE/Cloisite 30B-Ag nanocomposite films against Escherichia coli and Staphylococcus aureus bacteria were examined. Silver modified clay was treated using ion exchange reaction with silver nitrate solution. Low density polyethylene (LDPE) films incorporating Ag modified nanoclays were prepared by melt extrusion technique using a twin-screw extruder. Characterization of LDPE/Cloisite 30B-Ag nanocomposite films and Cloisite 30B-Ag nanoparticles was carried out using atomic absorption spectroscopy, scanning electron microscopy, X-ray diffraction, mechanical and microbial tests. Presence and incorporation of metallic Ag in the interlayer space of clays was confirmed by atomic absorption spectroscopy. The amount of metallic Ag particles in the clay was obtained to be 2.3 % (w/w) for Ag modified Cloisite 30B. Comparison of   the antimicrobial results of pure LDPE and LDPE/Cloisite 30B-Ag nanocomposite films showed more than 90% decrease in bacterial colony counts achieved by adding this type of nanoparticles.

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References

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Innovative Food Technologies
Volume 2, Issue 1
December 2014
Pages 27-37

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History

  • Receive Date: 17 August 2014
  • Revise Date: 12 October 2014
  • Accept Date: 23 November 2014

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