Novel Silicon Dioxide Based Nanocomposites As An Antimicrobial in Poly (Lactic Acid) Nanocomposites Films

Objective(s): due to nanocomposites antimicrobial properties, one of the most extensive usages of nano-products is in packing industry. thus, the production of packages with nanotechnology can effectively prevent against a variety of micro- organisms. in this study, the silicon dioxide nanoparticles the poly (lactic acid) pla films on antimicrobial and permeability was investigated. methods: in order to measure the effect of antibacterial nano-covers, the direct contact of 1%, 3% and 5% silicon dioxide nanoparticles was used. furthermore, the sample was contaminated with standard strains of gram-negative (escherich- ia coli –code of 1399 (atcc 25992)) and bacteria gram-positive (staphylococcus aureus–code of 1431 (atcc 25923)) provided. diameters of inhibition zones were measured after 24 h incubation of plates at 37 °c, by using digital caliper. also, the water vapor permeability was investigated according to astm e96 and oxygen standards according to astm d 3985 standard from film surface. results: comparison the mean diameter of the inhibition zone of escherichia coli, pla containing 3% silicon dioxide with pla film containing 5% silica showed no significant difference between the two groups (p> 0.05) as well as, the average diameter of staphylococcus aureus (p> 0.05). the results showed that the perme- ability compared to water vapor and oxygen vapor in pure pla films with pla con- taining 1%, 3% and 5% silicon dioxide showed a significant difference (p <0.05). conclusion: pla /nanocomposite sio2 films have been identified as the most effi- cient cover in reducing the microbial load and have been useful as active antimi- crobial nanopackaging.