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Preparation, Characterization and Antifungal Properties of Chitosan-Silver Nanoparticles Synergize Fungicide Against Pyricularia oryzae

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Rice (Oryza sativa L.) is one of the major staple food crops of nearly two-third of the world’s population. However, rice blast caused by fungus Pyricularia oryzae is generally considered the most serious disease of cultivated rice worldwide due to its extensive distribution and destructiveness under favourable climatic conditions. In this report, the combination between chitosan (CS) and silver (Ag), [email protected], was introduced for antifungal activity against Pyricularia oryzae extracted from blast-infected leaves. In detail, [email protected] nanoparticles (NPs) were first synthesized and further mixed with Trihexad 700 WP (Tri), [email protected], against the fungus by agar diffusion method. The prepared [email protected] NPs were characterized by Fourier transform infrared (FTIR), dynamic light scattering (DLS), transmission electron microscopy (TEM), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). In aqueous condition, [email protected] NPs were successfully prepared and existed as spherical NPs with particle size of 17.26 ± 0.89 nm, which is an ideal size for their uptake into plant cells, indicating that the size of their parentally [email protected] NPs is small enough to combine Tri, and their diameter is large enough to effectively penetrate the cellular membrane and kill fungi. More importantly, the antifungal property of [email protected] NPs was significantly increased with inhibition zone around 25 nm compared with only around 12 nm of [email protected] at the same concentration of Ag (2 ppm) and CS (4000 ppm). These results demonstrated that the synergistic effect of Tri and [email protected] NPs can be a potential candidate with high antifungal activity for the use of antibiotics in agriculture.
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Keywords: Antifungal Activity; Blast Disease; Chitosan; Pyricularia oryzae; Silver Nanoparticle

Document Type: Research Article

Affiliations: 1: Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam 2: Tissue Engineering and Regenerative Medicine, Department of Biomedical Engineering, International University, Vietnam National University-HCMC (VNU-HCMC), Ho Chi Minh City 700000, Vietnam 3: Graduate University of Science and Technology, Vietnam Academy of Science and Technology Hanoi 100000, Vietnam

Publication date: August 1, 2018

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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