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Fungus-Mediated Green Synthesis of Silver Nanoparticles Using Aspergillus terreus

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Author(s): Guangquan Li | Dan He | Yongqing Qian | Buyuan Guan | Song Gao | Yan Cui | Koji Yokoyama | Li Wang

Journal: International Journal of Molecular Sciences
ISSN 1422-0067

Volume: 13;
Issue: 1;
Start page: 466;
Date: 2011;
Original page

Keywords: silver nanoparticles | Aspergillus terreus | biosynthesis | NADH

ABSTRACT
The biosynthesis of nanoparticles has received increasing attention due to the growing need to develop safe, cost-effective and environmentally friendly technologies for nano-materials synthesis. In this report, silver nanoparticles (AgNPs) were synthesized using a reduction of aqueous Ag+ ion with the culture supernatants of Aspergillus terreus. The reaction occurred at ambient temperature and in a few hours. The bioreduction of AgNPs was monitored by ultraviolet-visible spectroscopy, and the AgNPs obtained were characterized by transmission electron microscopy and X-ray diffraction. The synthesized AgNPs were polydispersed spherical particles ranging in size from 1 to 20 nm and stabilized in the solution. Reduced nicotinamide adenine dinucleotide (NADH) was found to be an important reducing agent for the biosynthesis, and the formation of AgNPs might be an enzyme-mediated extracellular reaction process. Furthermore, the antimicrobial potential of AgNPs was systematically evaluated. The synthesized AgNPs could efficiently inhibit various pathogenic organisms, including bacteria and fungi. The current research opens a new avenue for the green synthesis of nano-materials.

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Tangokurs Rapperswil-Jona

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