Journal
CARBOHYDRATE POLYMERS
Volume 87, Issue 4, Pages 2664-2670Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2011.11.048
Keywords
Chitosan; Thiosemicarbazide; Thiosemicarbazone; Antifungal activity
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Funding
- National High Technology Research and Development Program (863Program) of China [2011AA09070405]
- Innovational Foundation of Chinese Academy of Sciences [KZCX2-EW-Q214]
- State Oceanic Administration People's Republic Of China [200905021-2]
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Three novel thiosemicarbazone chitosan derivatives were obtained via condensation reaction of thiosemicarbazide chitosan with phenylaldehyde, o-hydroxyphenylaldehyde, and p-methoxyphenylaldehyde, respectively. Antifungal activity against the common crop-threatening pathogenic fungi Stemphylium solani weber (S. solani), Rhizoctonia solani Kahn (R. solani), Alternaria solani (A. solani), and Phomopsis asparagi (Sacc.) (P. asparagi) was tested in vitro at 0.05.0.1. and 0.5 mg/mL. The derivatives had broad-spectrum antifungal activity that was greatly enhanced in comparison with chitosan. In fact, the highest antifungal index reached 100%. At 0.05 mg/mL, the o-hydroxyphenylaldehyde thiosemicarbazone chitosan inhibited growth of R. solani at 52.6%, and was stronger than polyoxin whose antifungal index was found to be 31.5%. The chitosan derivatives described here lend themselves to future applicative studies in agriculture. (C) 2011 Elsevier Ltd. All rights reserved.
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