• Publications
  • Influence
Isolation of steroidal sapogenins implicated in experimentally induced cholangiopathy of sheep grazing Brachiaria decumbens in Brazil.
The analysis of the B decumbens samples by acidic hydrolysis followed by TLC and infrared spectrum revealed diosgenin as the principal sapogenin present in the plant. Expand
Triterpenes and triterpenoidal glycosides from the fruits of Ilex paraguariensis (Maté)
A new triterpenoid glycoside, 3b-O-a-L-arabinopyranosyl rotundic acid, named here mateside (4), and the known triterpenes ursolic acid (1), acetylursolic acid (2), 23-hydroxyursolic acid (3), theExpand
Saponins and Sapogenins from Brachiaria decumbens Stapf
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,Expand
Triterpenoids from Brazilian Ilex species and their in vitro antitrypanosomal activity.
From the leaves of Ilex affinis and Ilex buxifolia, two adulterant species of "erva mate" (Ilex paraguariensis), three new triter penoid glycosides were isolated and the in vitro antitrypanosomal activity of some Ilex triterpenoids is reported. Expand
Matesaponin 5, a highly polar saponin from Ilex paraguariensis.
The structure of matesaponin 5, a novel saponin isolated from the leaves of the Ilex paraguariensis, was established as ursolicExpand
Triterpenoid saponins from Ilex paraguariensis.
The leaves of Ilex paraguariensis have yielded three new saponins named matesaponins 2, 3, and 4 [1-3], which have been characterized by chemical and nmr methods as ursolic acidExpand
Intrapilosins I-VII, pentasaccharides from the seeds of Ipomoea intrapilosa.
The presence of the (2R)- and (2S)-methylbutanoyl enantiomers bonded to the same oligosaccharide core in intrapilosins IV (4) and V (5) represents an example of diastereoisomerism due to a chiral esterifying moiety in the resin glycoside mixtures of a morning glory species. Expand
Triterpenoids from Brazilian Ilex Species and Their in Vitro Antitrypanosomal Activity
The observed results confirm the structural specificity of the I. paraguariensis triterpenoids and reinforce a previous proposal to detect mate adulteration by triter penoid analysis. Expand
Triterpenoid glycosides and a triterpene from Ilex brevicuspis.
Two saponins and a sapogenin were isolated from the leaves of Ilex brevicuspis by means of spectroscopic methods and established as brevic Suspisaponin 1, 2 and 3. Expand
Production of triterpenoids in liquid-cultivated hairy roots of Galphimia glauca.
The production of three triterpenoids from Galphimia glauca hairy root cultures, the sedative principle galphimine E (2), the recently described glaucacetalin A (3), and maslinic acid (6), wasExpand