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Title: Preparation of radiolysis-degraded oligochitosan, oligochitosan-Zn²⁺ complex and their induced effect against Anthracnose on soybean plants
Authors: Dang, Van Phu
Bui, Duy Du
Le, Nghiem Anh Tuan
Le, Thanh Hung
Nguyen, Quoc Hien
Keywords: Oligochitosan
Gamma-ray irradiation
Issue Date: 2019
Series/Report no.: Vietnam Journal of Chemistry;No 57(03) .- Page.363-367
Abstract: Anthracnose is the severely devastating disease in soybean cultivation. Employing chemical fungicides have been limited in modern agriculture. Currently, the oligochitosan (OC) and OC-Zn²⁺ complex have been evaluated as efficient fungicides. However, finding a proper method to produce them is still being actively encouraged. This work presents a preparation of 4 % OC solution (Mw ~ 5000 g/mol, the chemical structure unchanged in comparison with the chitosan) by gamma-ray irradiation combined with a small amount of H₂O₂. The OC-Zn²⁺ complex were prepared from OC and Zn²⁺ ion with a molar ratio of 1/0.5 by stirring at ambient condition. The importance characterization of OC-Zn²⁺ complex were determined by the GPC, UV-Vis, XRD, FT-IR techniques and that was evaluated the effectiveness of anthracnose resistance Soybean plants grown in a greenhouse. Atter the third spraying, a spore suspension of C. truncatum was introduced. The obtained results indicated that the OC-Zn²⁺ complex exhibited a significantly stronger disease resistance than that of OC. The disease incidence was of 52.2 % and 33.3 % (compared to 92 % of the control); disease severity was of 35.7 % and 13.8 % (79.9 % in the control) for OC and OC-Zn²⁺, respectively. Thus, the OC-Zn²⁺ complex has the potential for large-scale production and agricultural applieation.
ISSN: 2525-2321
Appears in Collections:Vietnam Journal of Chemistry

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