Spectroscopic study of the experimental parameters controlling the structural properties of chitosan–Ag nanoparticles composite

Moharram, M. A.; Khalil, Samar; Sherif, Hadeer H.A.; Khalil, Wafaa A.

doi:10.1016/j.saa.2014.01.099

Cited by 8 publications

(10 citation statements)

References 15 publications

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“…Estes aglomerados, eventualmente, conduzem à formação das nanopartículas coloidais de prata [57,59] . Devido esta aglomeração, um agente de estabilização é utilizado no processo de síntese para evitar a agregação das nanopartículas e para controlar o tamanho do produto final [60] . Estes estabilizadores desempenham um papel importante para controlar a formação de nanopartículas, bem como a sua estabilidade.…”

Section: Agy-tiunclassified

Desenvolvimento e caracterização de filmes compósitos de quitosana e zeólitas com prata

et al. 2015

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ResumoZeólitas foram submetidas à troca iônica ou impregnação com prata e posteriormente adicionadas em filmes de quitosana para a confecção de curativos para queimaduras. As zeólitas foram avaliadas por Ressonância magnética nuclear (RMN), Fluorescência de raios X por reflexão total (TXRF), Microscopia eletrônica de varredura (MEV). Os filmes poliméricos foram analisados com relação às suas propriedades mecânicas, permeabilidade ao vapor d'água (PVA) e liberação de prata. Observou-se que o procedimento de troca iônica não alterou a morfologia das zeólitas de partida. Grumos de zeólita foram observados nas micrografias dos filmes e estes influenciaram nas propriedades mecânicas devido à desorganizaçao local no empacotamento das cadeiras poliméricas da quitosana. A metodologia de troca iônica ou impregnação influenciou diretamente na quantidade de prata presente superficialmente na zeólita e consequentemente alterou o perfil de liberação de prata em uma solução simulada de exudato de ferida. Os modelos cinéticos sugeriram que a liberação da prata não foi essencialmente regulada pela lei de difusão de Fick. Palavras-chave: impregnação, troca-iônica, curativos para queimados, zeólita Y. AbstractZeolites were subjected to ion exchange or impregnation with silver and added to chitosan films for producing burns dressings. Zeolites were characterized by nuclear magnetic resonance (NMR), total reflection X-ray fluorescence (TXRF), scanning electron microscopy (SEM). The polymer films were analyzed with respect to their mechanical properties, water vapor permeability (WVP), and release of silver. It was observed that the ion exchange did not modify the morphology of the starting zeolite. Clusters of zeolite were observed in the micrographs of the films and they influenced the mechanical properties due to local disruption in the packing of the polymer chains of chitosan. The methodology of ion exchange or impregnation directly influenced the amount of silver present in the zeolite surface and consequently changed the silver release profile in an of simulated exudate fluid. The kinetic models suggested that the release of the silver was not primarily governed by Fick's law of diffusion.

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Section: Agy-tiunclassified

Desenvolvimento e caracterização de filmes compósitos de quitosana e zeólitas com prata

et al. 2015

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“…Also, the production of a very narrow particle size distribution with uniformity can be expected. Polymers with certain affinity toward metals such as chitin, chitosan [32] polyvinyl alcohol, polyacrylamide, acrylonitrile, and PVP, are the most used substance for metal nanoparticles stabilization [12]. Considerable attention is drawn to PVP owing to its special chemical and physical properties recommending it as a coating or as additive to different materials [6].…”

Section: Introductionmentioning

confidence: 99%

Assessment of in situ-Prepared Polyvinylpyrrolidone-Silver Nanocomposite for Antimicrobial Applications

et al. 2017

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Polyvinylpyrrolidone (PVP) is employed in several potential applications, relying of its special chemical and physical properties in addition to its low toxicity and biocompatibility. The aim of this work is to prepare polyvinylpyrrolidone-silver (PVP-Ag) nanocomposite with high inhibiting effect on the microbial growth and low cytotoxicity. In situ prepared small stable spherical silver nanoparticles, with narrow range particle size distribution, were obtained by easy, economical and rapid chemical reduction method. Silver ions were reduced to silver nanoparticles using low amount of sodium borohydride (NaBH4) as a strong reducing agent. PVP-Ag nanocomposite was prepared using PVP as a stabilizing and capping agent. Formation of the spherical silver nanoparticles with mean particle size 5 nm was confirmed by ultraviolet-visible spectroscopy, high resolution transmission electron microscopy, and dynamic light scattering. The inhibiting growth effect of the nanocomposite toward Gram-positive bacteria (Staphylococcus aureus), Gram-negative bacteria (Pseudomonas aeruginosa), and yeast fungus (Candida albicans) were studied. The cytotoxicity of the nanocomposite against BJ1 normal skin fibroblast cell line was tested. Results of this work presented perfect antimicrobial activity of the PVP-Ag nanocomposite towards bacteria and fungi with low cytotoxicity, which may lead to promising applications in skin wound healing.

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“…In the literature, Prakongkha et al [20] proposed the use of bare chitosan in vineyards; Matei et al reported that chitosan can inhibit esca (a vine disease that ravaged vineyards from Cognac to Bordeaux, France) mycelia growth by 90% [21]; and Aziz et al [22] successfully demonstrated that octameric chitosan oligomers doped with copper sulfate can induce defense reactions of the vine and resistance to gray mold and mildew. Other authors have assessed the antimicrobial properties for chitosan/nanosilver [23][24][25][26]. Nonetheless, to the best of the authors' knowledge, no studies have been conducted on ternary composites.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Chitosan Oligomers/Propolis/Silver Nanoparticles Composite Systems and Study of Their Activity againstDiplodia seriata

Matei

Martín-Ramos

Sánchez-Báscones

et al. 2015

International Journal of Polymer Science

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The synthesis and characterization of composites of oligomeric chitosan with propolis extract which allow the incorporation of a third component (silver nanoparticles) are reported, together with their application in aqueous or hydroalcoholic solutions with a view to the formation of adhesive substances or nanofilms for the protection of vineyards against harmful xylophagous fungi. The antimicrobial properties of the association of the two biological products or those resulting from the incorporation of silver nanoparticles (NPs) are studied and discussed. The efficacy of the chitosan oligomers/propolis/silver NPs ternary system is assessedin vitroforDiplodiafungi. A preliminary study on the convenience of replacing propolis with gentisic acid is also presented.

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Spectroscopic study of the experimental parameters controlling the structural properties of chitosan–Ag nanoparticles composite

Cited by 8 publications

References 15 publications

Desenvolvimento e caracterização de filmes compósitos de quitosana e zeólitas com prata

Desenvolvimento e caracterização de filmes compósitos de quitosana e zeólitas com prata

Assessment of in situ-Prepared Polyvinylpyrrolidone-Silver Nanocomposite for Antimicrobial Applications

Synthesis of Chitosan Oligomers/Propolis/Silver Nanoparticles Composite Systems and Study of Their Activity againstDiplodia seriata

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