title: Nano-biocomposite films with modified cellulose nanocrystals and synthesized silver nanoparticles.
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.
authors.affiliation: Materials Engineering Center, UdR INSTM, University of Perugia, Strada Pentima Bassa 4, 05100 Terni, Italy. Electronic address: elena.fortunati@unipg.it.
authors.forename: E
authors.initials: E
authors.lastname: Fortunati
authors.forename: S
authors.initials: S
authors.lastname: Rinaldi
authors.forename: M
authors.initials: M
authors.lastname: Peltzer
authors.forename: N
authors.initials: N
authors.lastname: Bloise
authors.forename: L
authors.initials: L
authors.lastname: Visai
authors.forename: I
authors.initials: I
authors.lastname: Armentano
authors.forename: A
authors.initials: A
authors.lastname: Jiménez
authors.forename: L
authors.initials: L
authors.lastname: Latterini
authors.forename: J M
authors.initials: JM
authors.lastname: Kenny
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000494:pharmacology; D002482:Cellulose / Q000737:chemistry*; D004926:Escherichia coli / Q000187:drug effects; D018857:Food Packaging; D007700:Kinetics; D019344:Lactic Acid / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry*; D011091:Polyesters; D011108:Polymers / Q000737:chemistry; D012834:Silver / Q000737:chemistry*; D013211:Staphylococcus aureus / Q000187:drug effects; D013501:Surface-Active Agents / Q000737:chemistry; D013696:Temperature
chemical_list: D000900:Anti-Bacterial Agents; D011091:Polyesters; D011108:Polymers; D013501:Surface-Active Agents; D019344:Lactic Acid; D012834:Silver; C033616:poly(lactide); D002482:Cellulose
keywords: Antibacterial activity; Barrier properties; Cellulose nanocrystals; Migration properties; Nano-biocomposites; Silver nanoparticles