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Antifungal properties of chitosan salts in laboratory media
Author(s) -
Ren Jianming,
Liu Jingli,
Li Rongchun,
Dong Fang,
Guo Zhanyong
Publication year - 2011
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.33612
Subject(s) - fusarium oxysporum , antifungal , chitosan , botrytis cinerea , cucumis , cladosporium , protonation , chemistry , organic chemistry , nuclear chemistry , biology , food science , botany , microbiology and biotechnology , penicillium , ion
Some aliphatic carboxylic acids were used to produce chitosan (CS) salts by reaction with CS, and their antifungal activity against three kinds of phytopathogens was estimated by hypha measurement in vitro. The fungicidal assessment showed that all of the CS salts had excellent activity against the tested fungi. Their inhibitory indices were 41.15–64.15, 56.25–76.56, and 35.94–68.75% for Cladosporium cucumerinum (Ell.) et Arthur, Monilinia fructicola (Wint.) Honey, and Fusarium oxysporum sp. Cucumis sativus L., respectively, at 1000 μg/mL; these indices were higher than that of CS. It was confirmed that the amino groups' protonation was important for the antifungal activity of CS derivatives. The substituted groups with stronger electronegativity drew more electrons from the nitrogen atoms in the derivative molecules, which relatively strengthened the polycationic character of the CS derivatives. Therefore, the antifungal activity of the CS salts was improved. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010