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Teixeira, A.F.) Secondary Metabolites from Virola molissima (Poepp. ex A. DC.) Warb. Fruits: Neolignans and Antifungal Activity (156p). DSc Thesis Graduate Program in Chemistry. Instituto de Química, Universidade de São Paulo, São Paulo. The use of plants in the treatment of diseases has been object of many studies, and since remote ages, the issue is linked to the cultural development of civilizations. Previous studies on Myristicaceous species described the occurrence of lignoids as its main secondary metabolites, which are known by varieties of chemical structures and biological activities. These lignoids are accumulated in all parts of the plant, mainly in the fruits, where the major constituent are neolignans. Present work was carried out on Virola molissima dispersed in Adolpho Ducke Reserve, located around Manaus, Amazon State, Brazil. Its fruits were collected during November, a month of dry season in this region. This species has not been phytochemically studied. Tetrahydrofuran, aryltetralone and dibenzylbutane neolignans were isolated from the extracts of pericarps, arils, seed coats and seeds of V. molissima fruits, by chromatographic fractionations. The structures of the isolated neolignans were elucidated through a comparison between Nuclear Magnetic Resonance of Hidrogen and Carbon data, and those described in the literature. The antifungal activity of the aryltetralone neolignan, pure or in mixture, was assayed against basidiomycetes Pycnoporus sanguineus, Trametes villosa and Lenzites trabeas. These fungi are xylophagus and they cause the decay of the wood.

Metabólitos secundários de frutos da Virola molissima (Poepp. ex A. DC.) Warb.: neolignanas e atividade antifúngica