Browsing by Autor "Luisa Balderrama"

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    4-Quinolinone alkaloids from Dictyoloma peruviana
    (Elsevier BV, 1995) Catherine Lavaud; Georges Massiot; Carmen Vásquez; Christian Moretti; Michel Sauvain; Luisa Balderrama
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    A search for natural bioactive compounds in Bolivia through a multidisciplinary approach
    (Elsevier BV, 2000) Verónica Francisca Loewe Muñoz; Michel Sauvain; Geneviève Bourdy; Jorgia Callapa; S. Bergeron; Irma Torres Rojas; José A. Bravo; Luisa Balderrama; B. Ortiz; A. Giménez
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    Anadanthoside: a flavanol-3-O-β-d-xylopyranoside from Anadenanthera macrocarpa
    (Elsevier BV, 1999) Sonia Piacente; Luisa Balderrama; Nunziatina De Tommasi; L. J. MORALES; L. Rivera Vargas; Cosimo Pìzza
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    Phytochemical and Pharmacological Studies of<i>Guettarda acreana</i>
    (Thieme Medical Publishers (Germany), 1998) Anna Capasso; Luisa Balderrama; Sirley Sivila; Nunziatina De Tommasi; L. Sorrentino; Cosimo Pìzza
    The present study examines the effects of the extracts [petroleum ether, CHCl3, CHCl3/MeOH (9:1) and MeOH], partially purified fractions and pure compounds from Guettarda acreana on the electrically induced contractions (E.C.I.) of the isolated guinea-pig ileum. The results of the experiments indicate that CHCl3/MeOH (9:1), MeOH extract, and the MeOH soluble part from CHCl3/MeOH extract tested at concentrations of 1.2, 2.5, and 5 micrograms/ml, dose-dependently reduced the guinea-pig ileum contractions. Furthermore, some partially purified fractions I-IV from the MeOH extract, each tested at the same concentrations of the extracts, and some pure compounds (6 x 10(-6), 3 x 10(-6), 1 x 10(-6) M) isolated from the above fractions significantly reduced, in a dose-dependent manner, the electrical contractions of the ileum. The active compounds were identified as the known indole alkaloids strictosidic acid, lyalosidic acid, 5 alpha-carboxystrictosidine, strictosidine, and sickingine, as well as the known quinic acid derivatives 5-caffeoylquinic acid, 4,5-dicaffeoylquinic acid, and shikimic acid by spectral data. Two known quinovic acid glycosides and a new triterpenic glycoside, quinovic acid 3 beta-O-alpha-rhamnopyranosyl-(1-->3)-(beta-glucopyranosyl-(1-->6)-beta- glucopyranoside, were also isolated and their structures established by NMR and M5 data.
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    Prenylisoflavanones from Geoffroea decorticans
    (Elsevier BV, 1998) José Vila; Luisa Balderrama; J. Bravo; Giovanna R. Almanza; Carles Codina; Jaume Bastida; Joseph D. Connolly
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    Triterpenes and anthraquinones from Picramnia sellowii Planchon in Hook (Simaroubaceae)
    (Elsevier BV, 2001) Luisa Balderrama; Alessandra Braca; Emilia García; Marcela Melgarejo; Cosimo Pìzza; Nunziatina De Tommasi