Assessment of antibacterial properties of novel silver nanocomposite

Recently, developed nanocomposite films with highly efficient antimicrobial properties are considered. This study investigated the antibacterial effects of tetraethyl orthosilicate-3-Tri-methoxysilyI-1-propanethiol-silver nanoparticle (TEOS-TMSPT@AgNPs) composite and pure silver nanoparticles (AgNPs). Antibacterial activities of AgNPs and TEOS-TMSPT@AgNPs were examined against the test bacteria Escherichia coli, Salmonella typhimurium, Staphylococcus aureus and Bacillus cereus, using disk diffusion, minimum inhibitory (MIC) and bactericidal (MBC) concentration methods. Comparing the antibacterial activity of AgNPs and TEOSTMSPT@AgNPs according to the zone of inhibition in millimeter (mm) showed that TEOS-TMSPT@AgNPs in addition to keeping the antibacterial activity of AgNPs, increase this activity against different bacterial strains. Composite containing AgNPs showed the lower Ag+ release than pure AgNPs when the storage time exceeds 21 days. These results suggested that TEOS-TMSPT@AgNPs could be a very interesting slow releasing nanocomposite film with antibacterial activity. (C) 2015 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.