The effect of Ag and clay nanoparticles on the antimicrobial activity of gamma-irradiated alginate/pectin beads
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ORIGINAL RESEARCH
The effect of Ag and clay nanoparticles on the antimicrobial activity of gamma‑irradiated alginate/pectin beads Faten Ismail Abou El Fadl1,2 · Sayeda Mohamed Ibrahim1,2 Received: 8 March 2020 / Accepted: 10 June 2020 © Islamic Azad University 2020
Abstract In spite of the intensive work done on the preparation, characterization and applications of silver nanoparticles, the problems limit its use, still under study. One of these solutions is embedding Ag NPs in natural polymers to decrease aggregation, control its toxicity and size, and to increase its stability as well. In this respect, ionically cross-linked alginate/pectin (ALG/ PEC) beads containing silver and clay nanoparticles, with different compositions were prepared. Silver nanoparticles have been obtained with hydrogel networks as nonreactors via in situ reduction of pre-adsorbed silver ions onto (ALG/PEC) beads matrix, using gamma irradiation. The effects of the composition of the two polymers, concentration of C aCl2 as a crosslinking agent on the formation of cross-linked beads were studied. Characterization of (ALG/PEC) beads, (ALG/PEC)/Ag and (ALG/PEC)/Clay-Ag nanocomposite beads were performed using scanning electron microscopy, transmission electron microscopy and X-ray diffraction (XRD). The XRD pattern obtained confirmed the presence of diffraction peaks related to Ag NPs and nanoclay. The antimicrobial activity, toward different micro-organisms of the prepared nanocomposite beads was examined. The Beads containing both Ag NPs and Nanoclay exhibited the highest antimicrobial activity for the different organisms chosen for the antimicrobial test. Graphic abstract
Keywords Alginate · Pectin · Nanocomposite · Antimicrobial activity · Beads · TEM · XRD
Introduction * Faten Ismail Abou El Fadl [email protected] Extended author information available on the last page of the article
Based on research results of studying the effects of silver nanoparticles stabilized by various matrices such as polymers, further research work may still attract many authors for
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Journal of Nanostructure in Chemistry
its possible promising contributions. Numerous procedures have been reported for the synthesis of silver nanoparticles. The most frequently used methods are chemical reduction by strong reducing agents such as NaBH4, and gamma radiation. In most cases, silver nanoparticles designed at various solvents or polymeric matrix are stabilized by surfactants and polymeric dispersants to control the size and shape of formed Ag nanoparticles [1]. In recent years, nanocomposites have received substantial attention because of their outstanding properties and broad applications [2]. Among of all, antimicrobial metallic polymer nanocomposites have excellent antimicrobial properties and potential applications in health care and biomedical field [3, 4]. Many researchers have been working on the preparation of the antimicrobial metallic polymer nanocomposites including polyester/claysilver nanocomposites [5], polym
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