DEFAR - Artigos publicados em periódicos

URI permanente para esta coleçãohttp://www.hml.repositorio.ufop.br/handle/123456789/531

Navegar

Filtros

2007 - 200912010 - 20171

Configurações

Autor: search.filters.author.Alves, Tânia Maria de Almeida

Resultados da Pesquisa

Agora exibindo 1 - 2 de 2
  • Nenhuma Miniatura Disponível
    Item
    Flavonol triglycosides of leaves from Maytenus robusta with acetylcholinesterase inhibition.
    (2017) Sousa, Grasiely Faria de; Aguiar, Mariana Guerra de; Takahashi, Jacqueline Aparecida; Alves, Tânia Maria de Almeida; Kohlhoff, Markus; Vieira Filho, Sidney Augusto; Silva, Grácia Divina de Fátima; Duarte, Lucienir Pains
    Although Maytenus robusta aqueous infusions of leaves are used in Brazilian traditional medicine for stomach disease treatment, only a few chemical studies of this species are found in literature. The phytochemical investigation of methanol extract from M. robusta leaves yielded the known compound kaempferol (3) and two new flavonol glycosides: kaempferol-3-O-b-D-glucopyranosyl-(1 !3)-a-Lrhamnopyranosyl-( 1 ! 2)-b-D-glucopyranoside (1) and quercetin-3-O-b-D-glucopyranosyl-(1 !3)-a-Lrhamnopyranosyl-( 1 ! 2)-b-D-glucopyranoside (2). The chemical structures of 1 and 2 were elucidated by 1D/2D NMR, ESI–MS and ESI–MS2 spectral data. It is the first time flavonoids have been reported from M. robusta. Flavonols 1 and 2 showed 66% and 80% acetylcholinesterase (AChE) inhibition, compared to 93% of the standard eserine, by the Ellman’s method. These substances are one of the few active flavonols linked to a trisaccharide chain in the literature presenting this activity, and contribute to the screening for new types of natural AChE inhibitors.
  • Nenhuma Miniatura Disponível
    Item
    Estudo fitoquímico do decocto das folhas de maytenus truncata reissek e avaliação das atividades antinociceptiva, antiedematogênica e antiulcerogênica de extratos do decocto.
    (2007) Fonseca, Ana Paula Nascentes de Deus; Silva, Grácia Divina de Fátima; Carvalho, Juliana de Jesus; Meléndez Salazar, Gloria Del Carmen; Duarte, Lucienir Pains; Silva, Renata Pamplona; Jorge, Rodrigo Martinez; Tagliati, Carlos Alberto; Zani, Carlos Leomar; Alves, Tânia Maria de Almeida; Peres, Valdir; Vieira Filho, Sidney Augusto
    The present paper describes the phytochemical investigation and biological activities of the chloroform, ethyl acetate and methanol extracts of leaf decocts of M. truncata Reiss (Celastraceae). Our studies afforded two flavonoid glycosides, quercetin-3-Orhamnopyranosyl- O-glucopyranosyl-O-rhamnopyranosyl-O-galactopyranoside (1) and kampferol-3-O-rhamnopyranosyl-Oglucopyranosyl- O-rhamnopyranosyl-O-galactopyranoside (2) from the methanolic extract and dulcitol (3) from the ethyl acetate extract. Ethyl acetate and methanol extracts exhibited considerable antiulcerogenic and analgesic activities. The results of the phytochemical studies suggest that the healing activity of methanol extracts can be related to the presence of glycosyl flavonoids.