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Academia Brasileira de Ciências, Anais da Academia Brasileira de Ciências, 2(79), p. 215-222, 2007

DOI: 10.1590/s0001-37652007000200004

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Complete ¹H and 13C NMR assignments and anti fungal activity of two 8-hydroxy flavonoids in mixture

Journal article published in 2007 by Susana Johann ORCID, Johann,Susana, Smânia-Jr,Artur, Pizzolatti,Moacir G., Moacir G. Pizzolatti, Jan Schripsema, Schripsema,Jan, Braz-Filho,Raimundo, Alexsandro Branco ORCID, Branco,Alexsandro
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

A mixture of the two new flavonols 8-hydroxy-3, 4', 5, 6, 7-pentamethoxyflavone (1) and 8-hydroxy-3, 3', 4', 5, 6, 7-hexamethoxyflavone (2) was isolated from a commercial sample of Citrus aurantifolia. An array of one- (¹HNMR, {¹H}-13C NMR, and APT-13C NMR) and two-dimensional NMR techniques (COSY, NOESY, HMQC and HMBC) was used to achieve the structural elucidation and the complete ¹H and 13C chemical shift assignments of these natural compounds. In addition, the antifungal activity of these compounds against phytopathogenic and human pathogenic fungi was investigated.