Data/hora: 02/06/2024 13:39:06

Biblioteca(s): 	Embrapa Instrumentação.	
Data corrente: 	19/01/2024	
Data da última atualização: 	26/03/2024	
Autoria: 	BRITO, S. C.; PEREIRA, V. A. C.; PRADO, A. C. F.; TOBIAS, T. J.; PARIS, E. C.; FERREIRA, M. D.	
Afiliação: 	Sao Paulo State University “Julio de Mesquita Filho”; Federal University of Sao Carlos; Sao Paulo State University “Julio de Mesquita Filho”; University of Sao Paulo; ELAINE CRISTINA PARIS, CNPDIA; MARCOS DAVID FERREIRA, CNPDIA.	
Título: 	Antimicrobial potential of linear low-density polyethylene food packaging with Ag nanoparticles in different carriers (Silica and Hydroxyapatite).	
Ano de publicação: 	2024	
Fonte/Imprenta: 	Journal of Microbiological Methods, v. 217–218. 106873, 2024.	
ISSN: 	0167-7012	
DOI: 	https://doi.org/10.1016/j.mimet.2023.106873	
Idioma: 	Inglês	
Conteúdo: 	Silver nanoparticles incorporation into polymeric packaging aims to prevent microbiological contamination in food products, thus ensuring superior food safety and preservation. In this context, this study aimed to verify the antimicrobial efficacy of linear low-density polyethylene (LLDPE) films incorporated with silver nanoparticles (AgNPs) dispersed in silica (SiO2) and hydroxyapatite (HAP) carriers at different concentrations. AgNPs + carriers polymer films were characterized at 0.2, 0.4, and 0.6% concentrations using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission gun-scanning electron microscope (FEG-SEM), thermogravimetric analyzer (TGA), differential scanning calorimetry (DSC), and migration in acidic and nonacidic simulants. Antimicrobial action was investigated on Gram-positive Staphylococcus aureus, Gram-negative Escherichia coli, and the Penicillium expansum and Fusarium solani fungi with antimicrobial activity by direct contact test and bacterial imaging by scanning electron microscopy. AgNPs addition to the LLDPE matrix did not interfere with the films’ chemical and thermal properties and presented no significant migration to the external medium. For antimicrobial action, silver nanoparticles showed, in most concentrations, an inhibition percentage higher than 90% on all microorganisms studied, regardless of the carrier. However, a greater inhibitory action on S. aureus and between carriers was found, making hydroxyapatite more effective. The results indicated that nanostructured films with AgNPs + hydroxyapatite showed more promising antimicrobial action on microorganisms than AgNPs + silica, making hydroxyapatite with silver nanoparticle potentially useful in food packaging, improving safety and maintaining quality.	
Palavras-Chave: 	Active food packaging; Inorganic carrier; Polymer films; Silver nanoparticles.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Instrumentação (CNPDIA)	
Exemplares: 	CNPDIA - (18385-1) - UPC - AP - DD - PROCI.24/17 -  - 2024/17 - DIS