Marine Bacterial Exopolymers-Mediated Green Synthesis of Noble Metal Nanoparticles with Antimicrobial Properties

A straightforward and green method for the synthesis of gold, silver, and silver chloride nanoparticles (Au NPs and Ag/AgCl NPs) was developed using three different microbial exopolymers (EP) as reducing and stabilizing agents. The exopolysaccharides and and the poly- -glutamic acid were produced by...

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Veröffentlicht in:Polymers 2019-07, Vol.11 (7), p.1157
Hauptverfasser: Scala, Angela, Piperno, Anna, Hada, Alexandru, Astilean, Simion, Vulpoi, Adriana, Ginestra, Giovanna, Marino, Andreana, Nostro, Antonia, Zammuto, Vincenzo, Gugliandolo, Concetta
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container_issue 7
container_start_page 1157
container_title Polymers
container_volume 11
creator Scala, Angela
Piperno, Anna
Hada, Alexandru
Astilean, Simion
Vulpoi, Adriana
Ginestra, Giovanna
Marino, Andreana
Nostro, Antonia
Zammuto, Vincenzo
Gugliandolo, Concetta
description A straightforward and green method for the synthesis of gold, silver, and silver chloride nanoparticles (Au NPs and Ag/AgCl NPs) was developed using three different microbial exopolymers (EP) as reducing and stabilizing agents. The exopolysaccharides and and the poly- -glutamic acid were produced by thermophilic bacteria isolated from shallow hydrothermal vents off the Eolian Islands (Italy) in the Mediterranean Sea. The production of metal NPs was monitored by UV-Vis measurements by the typical plasmon resonance absorption peak and their antimicrobial activity towards Gram-positive and Gram- negative bacteria ( and ), as well as fungi ( ) was investigated. The biological evaluation showed no activity for EP-Au NPs, except against , whereas EP-Ag NPs exhibited a broad-spectrum of activity. The chemical composition, morphology, and size of EP-Ag NPs were investigated by UV-Vis, zeta potential (ζ), dynamic light scattering (DLS) measurements and transmission electron microscopy (TEM). The best antimicrobial results were obtained for and (Minimum Inhibitory Concentration, MIC: 9.37-45 µg/mL; Minimum Bactericidal Concentration/Minimum Fungicidal Concentration, MBC/MFC: 11.25-75 µg/mL).
doi_str_mv 10.3390/polym11071157
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source Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; PubMed Central Open Access; MDPI - Multidisciplinary Digital Publishing Institute; PubMed Central
subjects Amino acids
Antiinfectives and antibacterials
Antimicrobial agents
Bacteria
Bioassays
Biological activity
Carbohydrates
Chemical activity
Chemical composition
Coliforms
E coli
Fungicides
Glucose
Glutamic acid
Gold
Lasers
Microorganisms
Morphology
Nanoparticles
Nanotechnology
Noble metals
Photon correlation spectroscopy
Proteins
Pseudomonas aeruginosa
Resonance absorption
Silver chloride
Stabilizers (agents)
Surfactants
Synthesis
Thermophilic bacteria
Transmission electron microscopy
Vents
Zeta potential
title Marine Bacterial Exopolymers-Mediated Green Synthesis of Noble Metal Nanoparticles with Antimicrobial Properties
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