Abstract
Extracellular Biosynthesis of Silver Nanoparticles Using Fungi and Their Antibacterial Activity
Highlights
Silver nanoparticles have attracted considerable attention due to their diverse properties and applications such as controlled drug delivery, biosensors, diagnostic and treatment of cancer, or antimicrobial agents [1,2,3]
An extensive physicochemical characterization was carried out including ultraviolet-visible spectroscopy (UV-Vis), transmission electron microscopy (TEM), dynamic light scattering (DLS), zeta-potential(zpotential) and gel electrophoretic mobility
From twelve fungal strains evaluated, eight (P. atropurpurascens, B. cinerea, P.expansum, P. ostreatus, P. chrysosporium, R. stolonifer, G. spectabilis, and G. frondosa) were found to reduce the silver salt to nanoparticles. This was observed through a color change in the reaction mixtures and the appearance of absorption bands between 400 and 450 nm, which were indicative of pronounced silver plasmon resonances (Fig. 1)
Summary
Silver nanoparticles have attracted considerable attention due to their diverse properties and applications such as controlled drug delivery, biosensors, diagnostic and treatment of cancer, or antimicrobial agents [1,2,3]. The biological method of synthesis of nanoparticles has proved to be better than some chemical or physical methods due to slower kinetics, which offers a better control over crystal growth and elimination of hazardous chemicals, making it an ecofriendly method [5] These methods of biosynthesis include the intracellular or extracellular production of nanoparticles of different elements by a variety of microorganisms and plant extracts [6, 7]. There had been previous reports of biosynthesis with some of the other species evaluated, the strains, the conditions of the culture and reaction performed in this work were different from the other reports To this aim, the production of silver nanoparticles using the extracellular cell-free filtrates of these fungi was investigated. This information was not usually reported despite its importance for the downstream processing of the nanoparticles and for their further biofunctionalization if their intended final use concerns applications where their multifunctionalization is a must
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