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Journal of Nanomaterials
Volume 2015, Article ID 241614, 7 pages
http://dx.doi.org/10.1155/2015/241614
Research Article

Silver Core-Shell Nanoclusters Exhibiting Strong Growth Inhibition of Plant-Pathogenic Fungi

1Department of Materials and Pharmaceutical Chemistry, Institute of Applied Materials Science, Vietnam Academy of Science and Technology, Ho Chi Minh City 700000, Vietnam
2University of Science and Technology of Hanoi, Hanoi 100000, Vietnam
3School of Agriculture and Forestry, Hue University, Hue 530000, Vietnam

Received 17 November 2014; Accepted 19 January 2015

Academic Editor: Antonios Kelarakis

Copyright © 2015 Viet Anh Ho et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We introduced a novel method to prepare silver core-shell nanoclusters (NCs) in which 3,4-dihydroxyphenyl acetic-conjugated oligochitosan (DHPAC) reduced silver salt and subsequently protected the produced nanosilver via mussel adhesion mechanism. Results indicated that the degree of conjugation was 14 dihydroxyphenyl acetamide moieties over 100 glucosamine units of oligochitosan. We used chitosan-catechol derivative to prepare the well-defined silver core-shell NCs and applied UV-visible spectroscopy, transmission electron microscopy (TEM), and X-ray diffraction (XRD) techniques to characterize the NCs. The core-shell NCs exhibited strong growth inhibition of plant-pathogenic fungi such as Phytophthora capsici, Phytophthora nicotianae, and Phytophthora colocasiae. These positive results may offer great potential to produce silver core-DHPAC shell NCs for several biomedical applications.