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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

âEstudo QuÃmico e AvaliaÃÃo Quimiopreventiva de Humirianthera ampla Miers, Simarouba versicolor e cinco espÃcies do gÃnero Lippia.â / Chemical study and chemopreventive evaluation of Humirianthera ampla Miers, Simarouba versicolor and five species of the Lippia genera.â

Ricardo de AraÃjo Marques 18 May 2011 (has links)
Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico / Humirianthera ampla Miers (Icacinaceae), Simarouba verscicolor A. St.-Hil. (Simaroubaceae), Lippia Alba (Mill) N.E. Br. (quimiotipos carvoneifera, citralifera e mirceneifera), Lippia gracillis Schauer e Lippia sidoides Cham., foram avaliadas como provÃveis fontes de compostos bioativos possuidores de atividade anticÃncer (antioxidante e/ou citotÃxica) atravÃs de ensaios in vitro, e os seus constituintes quÃmicos foram identificados e quantificados atravÃs mÃtodos espectroscÃpicos e espectromÃtricos. Em H. ampla foram identificados e quantificados cinco constituintes em suas folhas (esqualeno, α-tocoferol, campesterol, estigmasterol e β-sitosterol) e dez em suas raÃzes (Ãcido vanÃlico, Ãcido 3,4-di-hidroxibenzÃico, Ãcido sirÃngico, Ãcido gÃlico, campesterol, estigmasterol, annonalida, simiarenol, β-sitosterol e lupeol). A annonalida isolada das raÃzes de H. ampla apresentou potente atividade citotÃxica contra vÃrias linhagens de cÃlulas tumorais in vitro. Em S. versicolor foram identificados e quantificados seis constituintes em suas cascas (campesterol, estigmasterol, taraxerona, β-sitosterol, lupenona e sitostenona). A avaliaÃÃo do potencial antioxidante de H. ampla e S. versicolor apresentou resultados desapontadores quando comparados com outras espÃcies. Os Ãleos essenciais das espÃcies de Lippia foram avaliados por CG/EM e os constituintes majoritÃrios foram timol (Lippia sidoides, 65,5 %), carvona (Lippia alba carvoneifera, 48,6%) geraniol (Lippia alba citraleifera, 38,4 %; Lippia alba mircenefera, 31,9 %), nerol (Lippia alba citraleifera, 28,3 %; Lippia alba mirceneifera, 23,2 %), carvacrol (Lippia gracilis, 31,5 %) e limoneno (Lippia alba carvoneifera, 25,7 %). Os Ãleos essenciais e os extratos etanÃlicos das espÃcies de Lippia tiveram suas capacidades antioxidantes avaliadas, e somente o Ãleo essencial e o extrato etanÃlico de Lippia alba carvoneifera apresentaram resultados promissores. / Humirianthera ampla Miers (Icacinaceae), Simarouba verscicolor A. St.-Hil. (Simaroubaceae), Lippia Alba (Mill) N.E. Br. (chemotypes carvoneifera, citralifera and myrceneifera), Lippia gracillis Schauer and Lippia sidoides Cham., were evaluated as potential sources of bioactive compounds possessing anticancer activity (antioxidant or cytotoxic) by in vitro assays, and the chemical compounds were identified and quantified by epectroscopic and spectrometric methods. In H. ampla were identified and quantified five compounds in the leaves (squalene, α-tocoferol, campesterol, stigmasterol e β-sitosterol) and ten in the roots (vanillic acid, 3,4-dihydroxybenzoic acid, syringic acid, galic acid, campesterol, stigmasterol, annonalide, simiarenol, β-sitosterol and lupeol). Annonalide isolated from roots of H. ampla showed very high cytotoxicity against several cancer cell lines in vitro. In S. versicolor were identified and quantified six compounds in the bark (campesterol, stigmasterol, taraxerone, β-sitosterol, lupenone e sitostenone). The evaluation of the antioxidant capacity of H. ampla e S. versicolors showed disappointing results when compared with other species. The essential oils of Lippia species were evaluated by CG/MS and the major compounds were timol timol (Lippia sidoides, 65,5 %), carvone (Lippia alba carvoneifera, 48,6%) geraniol (Lippia alba citraleifera, 38,4 %; Lippia alba myrcenefera, 31,9 %), nerol (Lippia alba citraleifera, 28,3 %; Lippia alba myrceneifera, 23,2 %), carvacrol (Lippia gracilis, 31,5 %) and limonene (Lippia alba carvoneifera, 25,7 %). Antioxidant capacity of the essential oils and ethanolics extracts of Lippia species were evaluated, and only the essential oil and the ethanolic extract of Lippia alba showed promising results.

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