Molecules 2011, 16(5), 3885-3895; doi:10.3390/molecules16053885
Article

Fungitoxicity against Botrytis cinerea of a Flavonoid Isolated from Pseudognaphalium robustum

Milena Cotoras* email, Leonora Mendoza* email, Alexis Muñozemail, Karen Yáñezemail, Paulo Castroemail and María Aguirreemail
Facultad de Química y Biología, Universidad de Santiago de Chile, Avenida Bernardo O’Higgins 3363, Santiago, Chile
* Authors to whom correspondence should be addressed.
Received: 8 March 2011; in revised form: 30 April 2011 / Accepted: 5 May 2011 / Published: 9 May 2011
(This article belongs to the Section Natural Products)
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Abstract: The fungotoxicity against Botrytis cinerea of a flavonoid isolated from Pseudognaphalium robustum was analyzed. Two absorption column chromatographies and one semipreparative thin layer chromatography were used to purify the active flavonoid. It was determined, by 1H-NMR spectroscopy and co-elution with standards in HPLC, that this compound was 5,7-dihydroxy-3,8-dimethoxyflavone (gnaphaliin A). To determine the fungitoxicity of the purified compound, the effect on in vitro mycelial growth and conidial germination was studied. The compound concentration that reduced mycelial growth by 50% was 45.5 mg/mL. This compound also partially affected conidial germination of B. cinerea, reduced oxygen consumption by germinating conidia and affected the integrity of plasma membrane. Finally, using cyclic voltammetry, it was shown that the purified flavone had a pro-oxidant effect.
Keywords: antifungal activity; Botrytis cinerea; 5,7-dihydroxy-3,8-dimethoxyflavone; Pseudognaphalium robustum; pro-oxidants

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MDPI and ACS Style

Cotoras, M.; Mendoza, L.; Muñoz, A.; Yáñez, K.; Castro, P.; Aguirre, M. Fungitoxicity against Botrytis cinerea of a Flavonoid Isolated from Pseudognaphalium robustum. Molecules 2011, 16, 3885-3895.

AMA Style

Cotoras M, Mendoza L, Muñoz A, Yáñez K, Castro P, Aguirre M. Fungitoxicity against Botrytis cinerea of a Flavonoid Isolated from Pseudognaphalium robustum. Molecules. 2011; 16(5):3885-3895.

Chicago/Turabian Style

Cotoras, Milena; Mendoza, Leonora; Muñoz, Alexis; Yáñez, Karen; Castro, Paulo; Aguirre, María. 2011. "Fungitoxicity against Botrytis cinerea of a Flavonoid Isolated from Pseudognaphalium robustum." Molecules 16, no. 5: 3885-3895.

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