Viviane Silva Pires
Universidade Federal do Rio Grande do Sul
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Publication
Featured researches published by Viviane Silva Pires.
Journal of the Brazilian Chemical Society | 2002
Viviane Silva Pires; Alexandre Toshirrico Cardoso Taketa; Grace Gosmann; Eloir Paulo Schenkel
Four steroidal saponins and three sapogenins were identified from aerial parts of Brachiaria decumbens. Their structures were established by chemical and spectroscopic means (1H and 13C NMR, HMBC, HMQC) as 3b-methoxy-lanost-9(11)-ene (1), diosgenin (2a), yamogenin (2b), 3-O-b-D-glucopyranosyl-24(S)-ethyl-22E -dihydrocholesterol (3a), 3-O-b-D-glucopyranosyl-24(R)-ethyl-22E -dihydrocholesterol (3b), dioscin (4a) and 3-O-{a-L-rhamnopyranosyl-(1®4)-[a-L-rhamnopyranosyl-(1 ®2)]-b-D-glucopyranosyl}-25(S)-spirost-5-en-3 b-ol (4b). All these compounds were isolated for the first time from B. decumbens and compound 4b is described for the first time as far as we know.
Journal of Veterinary Diagnostic Investigation | 2001
Claudio Estevao Farias da Cruz; David Driemeier; Viviane Silva Pires; Eloir Paulo Schenkel
Cholangiohepatopathy was induced in 5 lambs by oral administration of extracts from signal grass (Brachiaria decumbens) in Brazil. Grossly there were pale foci multifocally distributed throughout the hepatic parenchyma in 4 lambs. The microscopic changes, which were similar to those produced by other steroidal sapogenins–containing plants such as Tribulus terrestris and Panicum spp., included multifocal chol-angitis, bile duct proliferation, and the presence of crystals in the biliary system.
Natural Product Letters | 2002
Viviane Silva Pires; Grace Gosmann; Dominique Guillaume; Eloir Paulo Schenkel
Two new saponins were isolated from the leaves of Ilex psammophila . Their structure was established by chemical and spectroscopic methods as 28- O - g - d -glucopyranosylester of 20( S )-ilexgenin A ( 4 ) and 28- O - g - d -glucopyranosylester of 20( S )-3 g ,19 f ,24-trihydroxyurs-12-ene-23, 28-dioic acid ( 5 ).
Journal of Natural Products | 2004
Alexandre Toshirrico Cardoso Taketa; Simone Cristina Baggio Gnoatto; Grace Gosmann; Viviane Silva Pires; Eloir Paulo Schenkel; Dominique Guillaume
Journal of Agricultural and Food Chemistry | 1997
Viviane Silva Pires; Dominique Guillaume; Grace Gosmann; Eloir Paulo Schenkel
Revista Brasileira De Farmacognosia-brazilian Journal of Pharmacognosy | 2001
Claiton Lencina; Viviane Silva Pires; Grace Gosmann; Alexandre Toshirrico Cardoso Taketa; Eloir Paulo Schenkel
Archive | 2007
Viviane Silva Pires; Sophie Da Nascimento; Pascal Maurice; Arnaud Bonnefoy; Alexandra Dassonville; Carole Amant; Chantal Legrand; Jacques Rochette; Pascal Sonnet
Archive | 2003
Ivomar Zancanaro; Claiton Lencina; Viviane Silva Pires; Pascal Sonnet; Dominique Guillaume; Eloir Paulo Schenkel
Archive | 2002
Alexandre Mello Machado; Carla Kauffmann; Viviane Silva Pires; Dominique Guillaume; Grace Gosmann
Archive | 1998
Viviane Silva Pires; Margareth Linde Athayde; Grace Gosmann; Eloir Paulo Schenkel
Collaboration
Dive into the Viviane Silva Pires's collaboration.
Alexandre Toshirrico Cardoso Taketa
Universidade Federal do Rio Grande do Sul
View shared research outputsAlexandre Toshirrico Cardoso Taketa
Universidade Federal do Rio Grande do Sul
View shared research outputsClaudio Estevao Farias da Cruz
Universidade Federal do Rio Grande do Sul
View shared research outputs