Synthesis and Anti-Mycobacterium tuberculosis Evaluation of Aza-Stilbene Derivatives

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Chemical and antifungal investigations of six Lippia species (Verbenaceae) from Brazil

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

OLIGOSTILBENOIDS FROM GNETUM-VENOSUM

The amazonian climber Gnetum venosum contains, besides the stilbenes resveratrol and rapontigentin (3-methoxyresveratrol), oxidative stilbene oligomers such as the dimer gnetin C and the trimers gnetin E, gnetin J (3''-hydroxygnetin E) and gnetin K (3''-methoxygnetin E). Gnetins J and K are described for the first time. Oligomers of stilbenoids constitute a new class of condensed tannins.

Characterization of resveratrol content in ten wild species of section Arachis, genus Arachis

Peanut is one of the few plants that synthesizes resveratrol, a phenolic compound of the stilbene class, which has been associated with reduced risk of developing chronic diseases, such as cancer, cardiovascular diseases, skin diseases, pulmonary diseases, diabetes and neurological diseases. Resveratrol was detected in different parts of the peanut plant, including roots, leaves, seeds and their derivatives. The wild species of the Arachis section are also strong candidates to synthesize resveratrol because they are phylogenetically closely related to cultivated peanut. Our objective was to characterize the resveratrol content in ten wild species of Arachis with three different genomes (A, B and K). The plant material was composed of leaves of the ten species treated (test) and not treated (control) with ultraviolet (UV) radiation. The test and control samples were extracted and the identification and quantification of resveratrol was performed using high performance liquid chromatography (HPLC). All species studied synthesized resveratrol and the concentrations ranged from 299.5 μg/g in A. kempff-mercadoi to 819.9 μg/g in A. cardenasii. DPPH antioxidant activity varied between 18.7 % for A. duranensis and 48.2 % in A. simpsonii. The results showed that wild Arachis species are a potential source of alleles for improvement of cultivated peanut, with the aim of achieving higher resveratrol content in leaves. © 2013 Springer Science+Business Media Dordrecht.

Produção de uva passa de BRS Morena: pré-tratamento, caracterização físico-química e composição fenólica

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Composição fenólica das partes comestíveis das uvas BRS Carmem e BRS Magna

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)