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Title: Formation and physiochemical properties of silver nanoparticles with various exopolysaccharides of a medicinal fungus in aqueous solution
Authors: Jian, W
Zhang, L
Siu, KC
Song, A
Wu, JY
Issue Date: 2017
Source: Molecules, Jan. 2017, v. 22, no. 1, 50
Abstract: Natural polysaccharides are the most widely used biopolymers for green synthesis of eco-friendly silver nanoparticles (AgNPs). In a previous study, a high molecular weight (MW) fraction of exopolysaccharides (EPS) produced by a medicinal fungus Cs-HK1 has been shown useful for green and facile synthesis of AgNPs in water. This study was to further evaluate the effects of molecular properties of EPS on the formation, stability and properties of AgNPs with different EPS fractions at various pH conditions. Three EPS fractions (P0.5, P2.0 and P5.0: MW high to low and protein content low to high) were reacted with silver nitrate at various pH 3.0-8.0 in water. The most favorable pH range was 5.5-8.0 for the formation and stable dispersion of AgNPs. At a given pH, the maximum amount of AgNPs was produced with P5.0, and the minimum with P0.5. The shape, size and physiochemical properties of AgNPs were strongly affected by the molecular characteristics of EPS (MW and conformation). The results may be helpful for understanding the factors and mechanisms for formation of stable AgNPs with natural polysaccharides and the interactions between AgNPs and the polysaccharide hydrocolloids in water.
Keywords: Dispersion stability
Fungal exopolysaccharide
Molecular characteristics
Molecular interactions
PH
Silver nanoparticle
Publisher: Molecular Diversity Preservation International (MDPI)
Journal: Molecules 
ISSN: 1420-3049
DOI: 10.3390/molecules22010050
Rights: © 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
The following publication Jian, W.; Zhang, L.; Siu, K.-C.; Song, A.; Wu, J.-Y. Formation and Physiochemical Properties of Silver Nanoparticles with Various Exopolysaccharides of a Medicinal Fungus in Aqueous Solution. Molecules 2017, 22, 50, 1-15 is available at https://dx.doi.org/10.3390/molecules22010050
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