Multifunctional ternary composite films based on PLA and Ag/alginate microbeads: Physical characterization and silver release kinetics.
Mater Sci Eng C Mater Biol Appl
; 98: 1159-1168, 2019 May.
Article
em En
| MEDLINE
| ID: mdl-30812999
ABSTRACT
Novel multifunctional composite poly(lactic acid) (PLA) films with alginate microbeads containing silver nanoparticles (AgNPs) were developed for potential antimicrobial food packaging applications. AgNPs, 10-20â¯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⯵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 10â¯days was within the prescribed limit of 0.05â¯mgâ¯kg-1 while the films induced inhibitory effects against Staphylococcus aureus in the agar diffusion test.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Poliésteres
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Prata
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Alginatos
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Nanocompostos
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Nanopartículas Metálicas
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article