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Dive into the research topics where Viviane Silva Pires is active.

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Featured researches published by Viviane Silva Pires.


Journal of the Brazilian Chemical Society | 2002

Saponins and Sapogenins from Brachiaria decumbens Stapf

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

Experimentally induced cholangiohepatopathy by dosing sheep with fractionated extracts from Brachiaria decumbens

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

Triterpenes and Saponins from Ilex psammophila

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

Triterpenoids from Brazilian Ilex Species and Their in Vitro Antitrypanosomal Activity

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

Saponins from Ilex dumosa, an Erva-mate (Ilex paraguariensis) adulterating plant

Viviane Silva Pires; Dominique Guillaume; Grace Gosmann; Eloir Paulo Schenkel


Revista Brasileira De Farmacognosia-brazilian Journal of Pharmacognosy | 2001

Tilirosídeo em Croton gnaphalii BAlLL

Claiton Lencina; Viviane Silva Pires; Grace Gosmann; Alexandre Toshirrico Cardoso Taketa; Eloir Paulo Schenkel


Archive | 2007

Short communication Type III collagen mimetic peptides designed with anti- or pro-aggregant activities on human platelets

Viviane Silva Pires; Sophie Da Nascimento; Pascal Maurice; Arnaud Bonnefoy; Alexandra Dassonville; Carole Amant; Chantal Legrand; Jacques Rochette; Pascal Sonnet


Archive | 2003

Análise fitoquímica de Ilex chamaedryfolia e isolamento de saponinas

Ivomar Zancanaro; Claiton Lencina; Viviane Silva Pires; Pascal Sonnet; Dominique Guillaume; Eloir Paulo Schenkel


Archive | 2002

Derivado do ácido quiláico isolado de folhas de Quillaja brasiliensis

Alexandre Mello Machado; Carla Kauffmann; Viviane Silva Pires; Dominique Guillaume; Grace Gosmann


Archive | 1998

Análise fitoquímica em Ilex psamophila

Viviane Silva Pires; Margareth Linde Athayde; Grace Gosmann; Eloir Paulo Schenkel

Collaboration


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Dominique Guillaume

Centre national de la recherche scientifique

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Grace Gosmann

Centre national de la recherche scientifique

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Grace Gosmann

Centre national de la recherche scientifique

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Alexandre Toshirrico Cardoso Taketa

Universidade Federal do Rio Grande do Sul

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Claiton Lencina

Universidade Federal do Rio Grande do Sul

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Margareth Linde Athayde

Universidade Federal de Santa Maria

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Alexandre Toshirrico Cardoso Taketa

Universidade Federal do Rio Grande do Sul

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Pascal Sonnet

University of Picardie Jules Verne

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Carla Kauffmann

Universidade Federal do Rio Grande do Sul

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Claudio Estevao Farias da Cruz

Universidade Federal do Rio Grande do Sul

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