Biocontrol of aflatoxins B1, B2, G1, G2, and fumonisin B1 with 6,7-dimethoxycoumarin, a phytoalexin from Citrus sinensis.
J Food Prot
; 69(9): 2224-9, 2006 Sep.
Article
em En
| MEDLINE
| ID: mdl-16995528
ABSTRACT
Phytoalexins (stress-induced compounds) from Citrus sinensis cultivar Valencia were screened for antifungal and antimycotoxic activity against a test organism (Cladosporium cladosporoides) and mycotoxin-producing fungi Fusarium verticillioides and Aspergillus parasiticus. The active compound, a member of the coumarin family of compounds, has antifungal and antimycotoxic activities and was chemically identified. High-performance liquid chromatography results indicated that Valencia oranges contain a trace amount (0.36 microg/g) of scoparone in untreated fruit, but concentrations increased in UV-irradiated fruit (15.2 microg/g). Infection with Penicillium digitatum, a natural spoilage mold of citrus fruit, caused a 35.51-microg/g increase in the phytoalexin. UV absorption, infrared absorption, and 1H nuclear magnetic resonance spectroscopy revealed that this phytoalexin is identical to 6,7-dimethoxycoumarin. This is the first report indicating that the stress-induced compound, 6,7-dimethoxycoumarin, isolated from P. digitatum-infected Valencia fruit confers resistance against the mycotoxigenic fungi A. parasiticus and F. verticillioides and causes a reduction in production of fumonisin B1 and aflatoxins G1, G2, B1, and B2.
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Bases de dados:
MEDLINE
Assunto principal:
Extratos Vegetais
/
Controle Biológico de Vetores
/
Cumarínicos
/
Aflatoxinas
/
Citrus sinensis
/
Fumonisinas
/
Conservação de Alimentos
Limite:
Humans
Idioma:
En
Revista:
J Food Prot
Ano de publicação:
2006
Tipo de documento:
Article
País de afiliação:
África do Sul