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Growth rate inhibition of phytopathogenic fungi by characterized chitosans
Oliveira Junior, Enio N; Gueddari, Nour E. El; Moerschbacher, Bruno. M; Franco, Telma T.
  • Oliveira Junior, Enio N; Universidade Estadual de Campinas. Faculdade de Engenharia Química. Departamento de Processos Químicos. BR
  • Gueddari, Nour E. El; University of Münster. Institute of Plant Biochemistry and Biotechnology. Münster. DE
  • Moerschbacher, Bruno. M; University of Münster. Institute of Plant Biochemistry and Biotechnology. Münster. DE
  • Franco, Telma T; Universidade Estadual de Campinas. Faculdade de Engenharia Química. Departamento de Processos Químicos. BR
Braz. j. microbiol ; 43(2): 800-809, Apr.-June 2012. ilus, graf, tab
Article in English | LILACS | ID: lil-644499
ABSTRACT
The inhibitory effects of fifteen chitosans with different degrees of polymerization (DP) and different degrees of acetylation (F A) on the growth rates (GR) of four phytopathogenic fungi (Alternaria alternata, Botrytis cinerea, Penicillium expansum, and Rhizopus stolonifer) were examined using a 96-well microtiter plate and a microplate reader. The minimum inhibitory concentrations (MICs) of the chitosans ranged from 100 µg × mL-1 to 1,000 µg × mL-1 depending on the fungus tested and the DP and F A of the chitosan. The antifungal activity of the chitosans increased with decreasing F A. Chitosans with low F A and high DP showed the highest inhibitory activity against all four fungi. P. expansum and B. cinerea were relatively less susceptible while A. alternata and R. stolonifer were relatively more sensitive to the chitosan polymers. Scanning electron microscopy of fungi grown on culture media amended with chitosan revealed morphological changes.
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Full text: Available Index: LILACS (Americas) Main subject: Polymers / In Vitro Techniques / Culture Media / Chitosan / Mitosporic Fungi / Antifungal Agents Limits: Animals Language: English Journal: Braz. j. microbiol Journal subject: Microbiology Year: 2012 Type: Article Affiliation country: Brazil / Germany Institution/Affiliation country: Universidade Estadual de Campinas/BR / University of Münster/DE

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Full text: Available Index: LILACS (Americas) Main subject: Polymers / In Vitro Techniques / Culture Media / Chitosan / Mitosporic Fungi / Antifungal Agents Limits: Animals Language: English Journal: Braz. j. microbiol Journal subject: Microbiology Year: 2012 Type: Article Affiliation country: Brazil / Germany Institution/Affiliation country: Universidade Estadual de Campinas/BR / University of Münster/DE