Diterpenoids
Mostrando 13-24 de 34 artigos, teses e dissertações.
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13. Chemical indexes calculated for 8,11,13-trien-abietane diterpenoids isolated from Swartzia species
A análise das estruturas moleculares dos compostos isolados de nove plantas do gênero Swartzia mostrou que, na produção de metabólitos especiais, algumas plantas abandonaram a rota do ácido shikimic/acetato e adotaram a rota do ácido mevalônico. Esta mudança é fator indicativo de que essas espécies são evolutivamente mais recentes. Já a diversid
Eclética Química. Publicado em: 2010-09
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14. Two new ent-kaurane diterpenoids from Albizia mollis (Wall.) Boiv
Dois novos diterpenos com esqueleto caurano, 3a,16b-17-tri-hidróxi-ent-caurano 3-O-β-D-glucopiranosídeo e ácido 2β,3α-di-hidróxi-ent-caur-15-eno-17-óico 3-O-β-D-glucopiranosídeo, foram isolados das cascas de Albizia mollis (Wall.) Boiv. As estruturas destes dois cauranos foram elucidadas por métodos espectroscópicos uni e bidimensionais e por esp
Journal of the Brazilian Chemical Society. Publicado em: 2010
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15. Abietatrienes diterpenoids from Sagittaria montevidensis SSP Montevidensis
The antimicrobial properties of the hexane, hexane/EtOAc and methanol fractions of the fresh petioles of Sagittaria montevidensis ssp montevidensis (Alismataceae) were evaluated against fungi and Gram-negative and Gram-positive bacteria. A new abietatriene-type diterpenoid, 3β,7α-dihydroxi-abieta-8,11,13-triene and the known 3β-hydroxy-abieta-8,11,13-trie
Química Nova. Publicado em: 2010
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16. Composição molecular e origem paleobotânica de âmbares da bacia do Araripe, Formação Santana
The terpenoid composition of seven amber samples from Araripe Basin (Santana Formation, Crato Member) has been analyzed by gas chromatography-mass spectrometry to determine their botanical origin. The diterpenoids, which have been identified in the fossil resin extracts are derived primarily from the abietane class, e.g., dehydroabietane, 4-epidehydroabietol
Química Nova. Publicado em: 2009
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17. Analysis of secondary metabolites produced by endophytic fungi associated to Cupressus lusitanica / Análise de metabólitos secundários produzidos por fungos endofíticos associados à Cupressus lusitanica
Some phytopatogenic fungi found in Cupressus species produces phytotoxins very aggressive to the host plant. Surprisingly, these toxins are diterpenoids structures, as well as some endogenus metabolites in Cupressus species. This fungi ability appears to be a specialized strategy in the association fungi-plant. These observations motivated the development of
Publicado em: 2009
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18. Diterpenos casbanos e acetofenonas de Croton nepetaefolius (Euphorbiaceae)
Croton nepetaefolius is an aromatic plant native to the northeast of Brazil where it is extensively used in folk medicine as a sedative, orexigen and antispasmodic agent. The present work deals with the chromatographic analysis of the ethanolic extract of Croton nepetaefolius stalk. It allowed the isolation and characterization of two diterpenoids named 1,4-
Química Nova. Publicado em: 2008
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19. Diterpenos tipo abietano isolados de Plectranthus barbatus Andrews
Plectranthus barbatus is largely used in the Northeast region of Brazil by the local population for treatment of digestive problems as substitute of boldo (Pneumus boldus). Phytochemical analysis of the leaf extracts of Plectranthus barbatus (Labiatae) cultivated in this region yielded two abietane diterpenoids, cyclobubatusin (1) and barbatusin (2) and a ne
Química Nova. Publicado em: 2007
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20. Determination of antitumor potential of diterpenes isolated from leaves of Casearia sylvestris Swarts / DeterminaÃÃo do potencial antitumoral de diterpenos isolados das folhas de Casearia sylvestris Swarts
Sabendo da importÃncia de cÃlulas de mamÃferos em cultura para avaliar a citotoxicidade de novas substÃncias com aÃÃo terapÃutica, o presente trabalho determinou, inicialmente, a atividade citotÃxica por MTT e hemolÃtica de 7 diterpenos clerodanos (Ãcido hardiwickiico, casearinas L, O, U e sua forma degradada, e casearinas X e Y) isolados a partir
Publicado em: 2007
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21. New diterpenoids from leaves of Guarea macrophylla (Meliaceae)
A fase em hexano do extrato etanólico das folhas de Guarea macrophylla (Meliaceae) foi submetida a fracionamento cromatográfico. Esses procedimentos permitiram o isolamento de um novo diterpenóide: 7alfa-hidroperóxido-isopimara-8(14),15-dieno-2alfa ,3beta-diol, um novo nor-diterpenóide: 19-nor-isopimara-7,15,4(18)-trien-3-ona além de sete diterpenóide
Journal of the Brazilian Chemical Society. Publicado em: 2005-06
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22. Estudo farmacognÃstico e determinaÃÃo da atividade biolÃgica de Vitex gardneriana Schauer (Verbenaceae)
Vitex gardneriana Schauer - Verbenaceae is a shrub encountered in the Brazilian northeastâs ecosystem âcaatingaâ. It is popularly called âjaramataiaâ, âjeremataiaâ, âgirimatoâ, âtamancaâ or âtamanqueiraâ. In the folk medicine, the leaves of V. gardneriana are used as sedative and anti-inflammatory. This work describes pharmacobotanical, phytoche
Publicado em: 2004
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23. Diterpenoids from Azorella compacta (Umbelliferae) active on Trypanosoma cruzi
The anti-Trypanosoma cruzi activity of natural products isolated from Azorella compacta was evaluated, with particular emphasis on their effect against intracellular amastigotes. Five diterpenoids from A. compacta derived from mulinane and azorellane were isolated and identified. Only two products, named azorellanol (Y-2) and mulin-11,3-dien-20-oic acid (Y-5
Memórias do Instituto Oswaldo Cruz. Publicado em: 2003-04
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24. Preparation and activity of diterpenoids against trypomastigotes of Trypanosoma cruzi
A systematic investigation on the trypanocidal effect of several natural products isolated from Brazilian plant species has been carried out. In this paper we report on the results obtained from the screening of 26 diterpenes from natural sources or of synthetic/microbial transformations origin (mainly derivatives of kaurenoic acid) against trypomastigote fo
Revista Brasileira de Farmacognosia. Publicado em: 2002