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Carbohydr Polym. 2014 Jan 30;101:1122-33. doi: 10.1016/j.carbpol.2013.10.055. Epub 2013 Oct 23.

Nano-biocomposite films with modified cellulose nanocrystals and synthesized silver nanoparticles.

Author information

1
Materials Engineering Center, UdR INSTM, University of Perugia, Strada Pentima Bassa 4, 05100 Terni, Italy. Electronic address: elena.fortunati@unipg.it.

Abstract

Ternary nano-biocomposite films based on poly(lactic acid) (PLA) with modified cellulose nanocrystals (s-CNC) and synthesized silver nanoparticles (Ag) have been prepared and characterized. The functionalization of the CNC surface with an acid phosphate ester of ethoxylated nonylphenol favoured its dispersion in the PLA matrix. The positive effects of the addition of cellulose and silver on the PLA barrier properties were confirmed by reductions in the water permeability (WVP) and oxygen transmission rate (OTR) of the films tested. The migration level of all nano-biocomposites in contact with food simulants were below the permitted limits in both non-polar and polar simulants. PLA nano-biocomposites showed a significant antibacterial activity influenced by the Ag content, while composting tests showed that the materials were visibly disintegrated after 15 days with the ternary systems showing the highest rate of disintegration under composting conditions.

KEYWORDS:

Antibacterial activity; Barrier properties; Cellulose nanocrystals; Migration properties; Nano-biocomposites; Silver nanoparticles

PMID:
24299883
DOI:
10.1016/j.carbpol.2013.10.055
[Indexed for MEDLINE]
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