Journal
MATERIALS SCIENCE AND ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
Volume 98, Issue -, Pages 1159-1168Publisher
ELSEVIER
DOI: 10.1016/j.msec.2019.01.074
Keywords
Poly(lactic acid); Silver nanoparticles; Alginate; Silver release
Categories
Funding
- Ministry of Education, Science and Technological Development of the Republic of Serbia [III 45019]
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Novel multifunctional composite poly(lactic acid) (PLA) films with alginate microbeads containing silver nanoparticles (AgNPs) were developed for potential antimicrobial food packaging applications. AgNPs, 10-20 nm in size, were synthesized in a Na-alginate solution by a hydrothermal method yielding a sterile, pH neutral colloid solution of low viscosity that was electrostatically extruded to produce Ag/alginate microbeads (190 mu m in size) with retained AgNPs. Dried microbeads were uniformly dispersed in PLA films with retained AgNPs as confirmed by UV-Vis spectroscopy and scanning electron microscopy. The films were characterized regarding thermal and mechanical properties as well as silver release in different food simulants. Results show that PLA matrix served as a diffusion barrier so that the released silver concentration in water after 10 days was within the prescribed limit of 0.05 mg kg(-1) while the films induced inhibitory effects against Staphylococcus aureus in the agar diffusion test.
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