Journal Article


Michael A Morris
Joseph P Kerry
Enda Cummins
Malco C Cruz-Romero
Shafrina Azlin-Hasim



gram negative bacteria silver nanoparticles films gram positive bacteria low density tensile strength antimicrobial activity carboxylic acid

The potential use of a layer-by-layer strategy to develop LDPE antimicrobial films coated with silver nanoparticles for packaging applications. (2015)

Abstract Commercial low-density polyethylene (LDPE) films were UV/ozone treated and coated using a layer-by-layer (LbL) technique by alternating the deposition of polyethyleneimine (PEI) and poly(acrylic acid) (PAA) polymer solutions and antimicrobial silver (Ag). The effects of the initial pH of the PEI/PAA polymer solutions alternating layers (pH 10.5/4 or 9/6.5) on the antimicrobial activity of the developed LbL coatings combined with Ag against Gram-negative and Gram-positive bacteria were investigated. The results from fourier transform infrared spectroscopy and toluidine blue O assay showed that LDPE LbL coated using PEI/PAA polymer solutions with initial pH of 10.5/4 significantly increased the presence of carboxylic acid groups and after Ag attachment the coating had higher antimicrobial activity against both Gram-negative and Gram-positive bacteria compared to the LDPE LbL coated using PEI/PAA polymer solutions with initial pH of 9/6.5. The LDPE LbL coated films using non-modified pH PEI/PAA polymer solutions decreased the water contact-angle indicating an increased hydrophilicity of the film, also increased the tensile strength and roughness of LDPE LbL coated films compared to uncoated LbL samples. The LDPE LbL coated films attached with Ag(+) were UV/ozone treated for 20min to oxidise Ag(+) to Ag(0). The presence of Ag(0) (Ag nanoparticles (NPs)) on the LDPE LbL coated films was confirmed by XRD, UV-vis spectrophotometer and colour changes. The overall results demonstrated that the LbL technique has the potential to be used as a coating method containing antimicrobial Ag NPs and that the manufactured films could potentially be applied as antimicrobial packaging.
Collections Ireland -> University College Cork -> PubMed

Full list of authors on original publication

Michael A Morris, Joseph P Kerry, Enda Cummins, Malco C Cruz-Romero, Shafrina Azlin-Hasim

Experts in our system

Michael A. Morris
University College Cork
Total Publications: 121
J P Kerry
University College Cork
Total Publications: 130
Enda Cummins
University College Dublin
Total Publications: 24
Malco Cruz-Romero
University College Cork
Total Publications: 7
Shafrina Azlin-Hasim
University College Cork
Total Publications: 4