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1.
Rev. bras. farmacogn ; 26(3): 342-346, May-June 2016. tab, graf
Article in English | LILACS | ID: lil-784280

ABSTRACT

Abstract In hybrid cultivated form, Dendranthema grandiflorum (Ramat.) Kitam., Asteraceae, flowers (Chrysanthemum morifolium Ramat.) were utilized in the production of extracts, which were analyzed for larvicidal activity against Aedes aegypti third instar larvae. Methanol and dichloromethane extracts showed LC50 values of 5.02 and 5.93 ppm, respectively. Using GC–MS, phytochemical analyses of the dichloromethane extract showed the presence of triterpenoids and fatty acids, while flavonoids and caffeoylquinic acids were shown to occur in the methanol extract by ESI Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (ESI-FT-ICR-MS). Triterpenoids and fatty acids are well known insecticidal compounds. From this study, it can be concluded that D. grandiflorum grown for floriculture, as an agribusiness, can have additional applications as raw material for the production of insecticidal products.

2.
Rev. bras. farmacogn ; 21(6): 991-999, Nov.-Dec. 2011. ilus, graf, tab
Article in English | LILACS | ID: lil-602283

ABSTRACT

The ethanol extract of the vegetal species Pentaclethra macroloba (Willd.) Kuntze, Fabaceae, was fractioned and the antibacterial activity was determined. The active ethyl acetate (ea) fraction showed activity against Gram-positive (Staphylococcus spp. and Enterococcus spp.) and Gram-negative (Pseudomonas aeruginosa, Acinetobacter spp. and Klebsiella pneumoniae) multiresistant bacteria. Gallic acid derivatives were identified as the main compounds in inactive subfractions from the ea fraction, while the active one afforded ellagic acid as the major constituent when submitted to acid hydrolysis reaction, which suggests the presence of hydrolysable tannins. The minimum bactericidal concentration analysis showed a bactericide mechanism of action for the tannin subfraction found. The antibacterial mechanism of action of the active tannin subfraction against S. aureus reference strains (ATCC 29213 e 33591) was proposed adopting an in vitro assay of protein synthesis inhibition. For this, bacterial cells were labeled with [35S] methionine in the presence of the subfraction. The protein synthesis inhibition was observed at 256 µg/mL of this subfraction. At this concentration it did not present cytotoxicity in eukaryotic cells by the neutral red technique, suggesting selective toxicity. The present study is the first in vitro investigation of the antibacterial properties of tannin fractions obtained from a polar extract of P. macroloba.

3.
Rev. bras. farmacogn ; 21(1): 86-91, jan.-fev. 2011. tab
Article in English | LILACS | ID: lil-580357

ABSTRACT

In order to validate the Bumelia sartorum Mart., Sapotaceae, traditional use for infection diseases, this study evaluates the antibacterial activity of the stem bark fractions against methicillin-sensitive (MSSA) and methicillin-resistant (MRSA) Staphylococcus aureus strains by using the agar dilution method and reported as MIC (minimal inhibitory concentration). In addition, the DPPH scavenging activity of these fractions was measured and the chemical composition and acute toxicity of the active fraction were also determined. The ethyl acetate (EtOAc) extract was chemically analyzed by LC/MS, direct ionization APCI/MS, ¹H NMR and 13C-NMR. All fractions, except butanol extract, presented high antioxidant activity, especially the methanol and the EtOAc extracts, which showed EC50 values (5.67 and 5.30 µg/mL, respectively) considerably lower than the Gingko-standard EGb 761® (38.58 µg/mL). The antibacterial activity against S. aureus strains was observed in EtOAc (MIC 256-512 µg/mL), which showed a very low toxicity. The chemical study of this fraction revealed the abundant presence of polyphenolic compounds. The antibacterial and antioxidant activities reported in this paper for EtOAc extract from B. sartorum and the low toxicity of this fraction opens the possibility that it could be helpful for the developing of new antibacterial agents for treating S. aureus infections.

4.
Rev. bras. farmacogn ; 20(2): 147-153, Apr.-May 2010. ilus, graf, tab
Article in English | LILACS | ID: lil-550007

ABSTRACT

The antioxidant activity of leaf extracts from Jacaranda puberula Cham., Bignoniaceae, was assayed by the DPPH (2,2-diphenyl-1-picryl-hydrazyl) free radical scavenging method. Three phytomedicines (F1, F2, and F3) used as blood depurative, were tested by the same method. The free radical scavenger potential was measured by the discoloration of the solution. The EC50 values from Gingko bilobaEGb 761® extract and rutin, used as antioxidant for medical purposes, were used as reference. The ethanol extract (EE), ethyl acetate (EA), butanol (EB), aqueous (EAq) and the sample A (obtained from extract EB), showed lower EC50 values than other extracts and phytomedicines. The antioxidant activity (AA) of the extracts was related with the presence of the polyphenol compounds such as verbascoside (1) and cis-caffeoyl aldehyde (2). These structures were determined by chemical and spectroscopic methods and comparison with literature data.


Os extratos obtidos a partir das folhas de Jacaranda puberulaCham., Bignoniaceae, foram avaliados quanto à atividade antioxidante utilizando-se o método do radical livre DPPH (2,2-difenil-1-picril-hidrazila). Também foram incluídos na avaliação três medicamentos fitoterápicos comerciais (F1, F2 e F3) indicados como depurativos do sangue. Através da descoloração das soluções testadas, foi possível medir o potencial sequestrador do radical DPPH. Como referência, utilizou-se os dados da literatura de CE50 do extrato padronizado de Gingko bilobaEGb 761® e o flavonoide rutina, ambos empregados em medicamentos com atividade antioxidante. Entre os extratos testados, os que apresentaram valores baixos de CE50 foram os extratos etanólico bruto (EE), em acetato de etila (EA), em butanol (EB), aquoso (EAq) e da amostra A, obtida do extrato EB. Os fitoterápicos comerciais apresentaram altos valores de CE50. Com base nos resultados das análises feitas por de RMN de 13C e ¹H, CLAE-DAD e de acordo com os dados da literatura, a presença de substâncias fenólicas como o verbascosídeo (1) e o aldeído cis-caféico (2), contribuíram para a atividade antioxidante (AA) dos extratos ativos.

5.
Genet. mol. biol ; 33(3): 549-557, 2010. graf, tab
Article in English | LILACS | ID: lil-555828

ABSTRACT

Echinodorus macrophyllus, commonly known as chapéu-de-couro, is a medicinal plant used in folk medicine to treat inflammation and rheumatic diseases. In this work, we used short-term bacterial assays based on the induction of SOS functions to examine the genotoxicity and mutagenicity of an aqueous extract of E. macrophyllus leaves. Whole extract and an ethyl acetate fraction showed similar genotoxicity and caused an ~70-fold increase in lysogenic induction. The extract also gave a positive result in the SOS chromotest with an increase of 12-fold in beta-Galactosidase enzymatic units. There was a strong trend towards base substitutions and frameshifts at purine sites in the mutations induced by the extract in Escherichia coli (CC103 and CC104 strains) and Salmonella typhimurium test strains (22-fold increase in histidine revertants in TA98 strain). Since reactive oxygen species may be implicated in aging process and in degenerative diseases, we used antioxidant compounds as catalase, thiourea and dipyridyl in the lysogenic induction test. All this compounds were able to reduce the induction factor observed in the treatment with chapéu-de-couro, thus suggesting that the genotoxicity and mutagenicity were attributable to the production of reactive oxygen species that targeted DNA purines.


Subject(s)
Animals , Alismataceae/genetics , Escherichia coli , Plant Extracts , Salmonella , Reactive Oxygen Species , Mutagenicity Tests , Plants, Medicinal
6.
Int. j. high dilution res ; 9(31)2010. graf, tab
Article in English | LILACS | ID: lil-551007

ABSTRACT

Motivação: Embora Hahnemann tenha descrito o método LM na 6ª. Edição do Organon da Arte de Curar, poucas pesquisas tem sido feitas sobre as propriedades físico-químicas destas preparações. Além disso, ainda não existem evidências que apontem para a correlação entre propriedades físico-químicas e os efeitos biológicos das altas diluições. Objetivos: determinar características físico-químicas das preparações LM tais como condutividade elétrica, pH e índice de refração, bem como o efeito biológico em modelos experimentais. Materiais e Métodos: foi analisada uma série de diluições desde 1 lm até 10 lm de Euphorbia tirucalli L., preparada a partir do látex e do suco da planta. Para considerar as características sazonais desta planta, usamos 2 populações diferentes, colhidas uma em Junho de 2007 e outra em Maio de 2008. Além disso, o efeito citotóxico da Euphorbia tirucalli L. 5 lm foi testado em células humanas cancerosas (MCF7) através de ensaio MTT. Conclusões: Algumas diferenças entre as duas populações foram observadas. No entanto, nenhuma correlação clara pode ser observada entre as propriedades físico-químicas e a atividade biológica.


Background: although Hahnemann described the fifty-milesimal (LM) method in the 6th edition of the Organon of the Medical Art, very little research has been carried out on the physical chemical properties of these homeopathic preparations. Furthermore, there is still no evidence allowing for the correlation between the alleged physical chemical properties and the biological effects of high dilutions. Aims: to evaluate physical chemical characteristics of LM preparations including electrical conductivity, pH and refraction index, and their effect on biological experimental models. Materials and methods: preparations tested for physical chemical analysis were dilutions 1 lm to 10 lm of Euphorbia tirucalli L. prepared from the latex and the juice of the plant. To rule the seasonal characteristics of this plant, 2 different populations were used, one collected in June 2007 and the other in May 2008. Furthermore, the cytotoxic effect of Euphorbia tirucalli 5 lm was tested on human breast cancer cells (MCF7) through MTT assay. Conclusions: Some differences among the two collections were observed. However, any clear correlation could be observed between physical chemical properties and biological activity.


Motivación: Aunque Hahnemann describió el métodocincuenta milesimal (LM) en la 6 ª edición del Organon del Arte Médica, muy poca investigación se ha realizado sobre las propiedades físico-químicas de estos preparados homeopáticos. Por otra parte, todavía no hay pruebas que permitan la correlación entre las presuntas propiedades físico-químicas y los efectos biológicos, de las altas diluciones. Objetivos: evaluar las características físico-químicas de los preparados LM, incluyendo conductividad eléctrica, pH y el índice de refracción, y su efecto en modelos biológicos experimentales. Materiales y métodos: las muestras para el análisis físico-químico fueron diluciones 1 a 10 lm de Euphorbia tirucalli L. preparadas a partir del látex y el jugo de la planta. Para descartar las características sazonales de esta planta, dos poblaciones diferentes fueron utilizadas, una recogida en junio de 2007 y otro en mayo de 2008. Además, el efecto citotóxico de Euphorbia tirucalli 5 lm fue probado en células humanas de cáncer de mama (MCF7) a través del ensayo MTT. Conclusiones: Algunas diferencias entre las dos colecciones se observaron. Sin embargo, ninguna correlación clara se observó entre las propiedades físicas- químicas y actividad biológica.


Subject(s)
Fifty Millesimal , Cytotoxicity, Immunologic , Hydrogen-Ion Concentration , Electric Conductivity , Dynamization , Euphorbia , Refractometry
7.
Rev. bras. farmacogn ; 19(3): 781-784, jul.-set. 2009. tab
Article in Portuguese | LILACS | ID: lil-537926

ABSTRACT

O presente trabalho avalia a atividade antiviral de extratos e frações de Musa acuminata Colla, Musaceae, coletada em duas regiões do Estado do Rio de Janeiro (Petrópolis e Santo Antônio de Pádua). As inflorescências de M. acuminata apresentaram excelente atividade para os dois vírus avaliados: herpesvírus simples humano tipo 1 e herpesvírus simples humano tipo 2, ambos resistentes ao Aciclovir. Os resultados indicam que os extratos de M. acuminata testados podem constituir alvo potencial para uso em terapias antivirais.


This study evaluates the antiviral activity of extracts and fractions of Musa acuminata Colla collected in two regions of Rio de Janeiro State (Petrópolis and Santo Antônio de Pádua). The inflorescences of M. acuminata showed excellent activity for the two virus evaluated: simple human herpesvirus type 1 and simple human herpesvirus type 2, both resistant to Acyclovir. The results indicate that the tested extracts of M. acuminata can be potential target for use in antiviral therapy.

8.
Braz. j. pharm. sci ; 45(3): 507-514, July-Sept. 2009. graf, tab
Article in English | LILACS | ID: lil-533179

ABSTRACT

Nowadays, the high blood pressure is one of the main causes of death and cardiovascular diseases. Vasodilator drugs are frequently used to treat arterial hypertension. Experiments were undertaken to determine whether hydroalcoholic extracts obtained from leaves of field-grown Alpinia purpurata and A. zerumbet cultured in vitro under different plant growth regulators induce a vasodilator effect on Wistar rat mesenteric vascular bed pre-contracted with norepinephrine. Plant extracts were able to induce a long-lasting endothelium-dependent vasodilation. Efficiency on activity of A. purpurata reached 87 percent at concentration of 60 μg. The extract of A. zerumbet maintained in medium containing IAA, induced the relaxation (17.4 percent) at 90 μg, as compared to the control (MS0) that showed a better vasodilator effect (60 percent). These results are in agreement with the quantification of phenolic compounds in the extracts, which were 50 percent lower for those plants cultured in IAA. A. purpurata was assayed for the first time in relation to its vasodilator activity. This paper showed a strong probability of correlation between the pharmacological activities of A. purpurata with their content in phenolic compounds.


Atualmente, a hipertensão arterial é uma das maiores causas de morte e de doenças cardiovasculares. Os vasodilatadores são freqüentemente utilizados no tratamento da hipertensão. Extratos hidroalcoólicos de Alpinia purpurata de campo e de A. zerumbet cultivada in vitro sob diferentes reguladores de crescimento vegetal foram ensaiados no leito mesentérico de ratos Wistar. Os extratos de A. purpurata e A. zerumbet produziram efeito vasodilatador com padrão de resposta dose-dependente de duração prolongada. Extratos da espécie A. purpurata tiveram efeito vasodilatador de 87 por cento na dose de 60 μg. O extrato obtido de folhas de A. zerumbet oriundas das culturas mantidas em meio contendo AIA (ácido indol acético) inibiu o relaxamento (17,4 por cento) na dose de 90 μg em relação ao controle (MS0), com o qual foi verificado melhor efeito vasodilatador (60 por cento). Estes resultados estão de acordo com a concentração de fenóis totais que foi 50 por cento menor para os extratos de plantas cultivadas in vitro em AIA. A espécie A. purpurata foi pela primeira vez ensaiada quanto à atividade vasodilatadora. Os resultados obtidos indicaram a presença de substâncias fenólicas provavelmente correlacionadas à ação terapêutica de A. purpurata.


Subject(s)
Animals , Male , Rats , Alpinia , Plant Extracts/therapeutic use , Vasodilator Agents/pharmacokinetics , Endothelium , Plant Structures/growth & development , Flavonoids , Pharmacognosy/methods , Physiological Phenomena , Plants, Medicinal
9.
Int. j. high dilution res ; 7(24): 132-139, 2008. ilus, graf
Article in English | LILACS | ID: lil-529834

ABSTRACT

The latex of Euphorbia tirucalli L. (Aveloz) is popularly used to treat cancers from diverse sources such as: breast, prostate, lung and kidney. Furthermore, high dilutions of this latex (latex-HDs) have been successfully used in the treatment of tumors, although the mechanisms involved in this antitumoral activity are not yet known [...] Latex-HDs were obtained through the interaction of two procedures: 1:100 dilution in mass and agitation, using 2 solvents, water and 70% ethanol in homeopathic preparations 5, 15 and 30cH, following the Brazilian Homeopathic Pharmacopeia. Cell lines were incubated with 1 % and 10 % of latex-HDs for 24 hours. Controls treated with similar preparations without latex were incubated under the same conditions. Cell viability was analyzed by MTT assay and morphological features were assessed by May-Grunwald-Giemsa method. Cell ultrastructure was analyzed by transmission electron microscopy. Metabolic alterations were detected by spectrophotometric assay for the enzyme 6-phosphofructo-1-kinase (PFK-1) activity. 1% of ethanolic latex-HDs induced no alterations in MelanA cells viability, however Aveloz 15cH induced an increase in MCF7 cells viability. After aqueous treatment, MelanA cells viability decreased in almost all systems, whereas in MCF7 cells, an increase was detected in dynamized water systems and Aveloz 15CH. However, only water 15cH increased cell viability in comparison to control and non-dynamized water. No alterations in MCF7 morphology and ultrastructure were visualized through light microscopy or electronic microscopy, respectively. Interesting results were detected when we studied the glycolytic metabolism of both cells, giving support to evidences showing that HDs interfere in the metabolism of cell lines. Further studies are needed to better understand the mechanisms involved in this in vitro biological response to HDs.


O látex de Ephorbia tirucalli L. (aveloz) é usado popularmente no tratamento de diversos tipos de câncer incluindo mama, próstata, pulmão e rim. Além do mais, altas diluições desse látex (latex-HDs) têm sido utilizadas com sucesso no tratamento de tumores, embora o mecanismo dessa ação ainda seja desconhecido [...] As látex-HDs foram obtidas através de 2 procedimentos: diluição 1:100 em massa e agitação, com 2 solventes, água e etanol 70%, nas diluições homeopáticas 5, 15cH e 30cH de acordo com a Farmacopéia Homeopática Brasileira. As linhas celulares foram incubadas com látex-HDs 1% e 10% por 24 horas. Foram preparados controles similares sem o látex e incubados sob as mesmas condições. A viabilidade celular foi analisada através do método May-grunwald-Giemsa. A ultrastrutura celular foi analisada através de microscopia eletrônica de transmissão. As alterações metabólicas foram detectadas por ensaio de espectrofotometria para a atividade da enzima 6-fosfofructo-1-quinase (PFK-1). Látex-Hds em etanol 1% não induziram qualquer alteração na viabilidade das células MelanA, mas Aveloz 15cH induziu aumento da viabilidade das células MCF7. Após tratamento, a viabilidade das células MelanA diminuiu em quase todos os sistemas, enquanto que nas células MCF7 foi detectado aumento nos sistemas aquosos e Aveloz 15cH, mas só água 15cH aumentou a viabilidade celular por comparação ao controle e água não dinamizada. Não foram detectadas alterações na morfologia celular por microscopis de luz quando se estudou o metabolismo glicolítico em ambas as células, demonstrando que os padrões de resposta celular dependem do tipo de solvente, metabolismo celular e procedimento de diluição. Esta é a primeira vez que se mostra que as altas diluições interferem no metabolismo de linhas celulares. Outros estudos são necessários para se compreender melhor os mecanismos envolvidos nesta resposta in vitro a altas diluições de aveloz.


Subject(s)
Cells , Dilution , Euphorbia , Homeopathy , Metabolism
10.
Int. j. high dilution res ; 7(25): 174-178, 2008. graf
Article in English | LILACS | ID: lil-529849

ABSTRACT

The latex extracted from Euphorbia tirucalli, a plant popularly known as Aveloz, is used in complementary medicine to induce tumor regression. However, as this latex has toxic effects when administered orally in ponderal doses, the present study was designed to assess the effects of high dilutions in healthy mice over a period of 18 weeks. The Aveloz latex-high diluted solutions (latex-HD) were obtained through the interaction of two processes: 1:100 dilution in mass and succussion, using ethanol 70% as a solvent, in the homeopathic dilutions of 5, 15 and 30cH, following Farmacopéia Homeopática Brasileira. Control solutions without latex were compounded (ethanolic-HD) in the same dilutions and were administered simultaneously. The animals which received latex-HD 30cH showed a significant increase in food consumption (p < 0.05) without significant difference in weight gain. In regards to water consumption, no statistical difference was shown when different Aveloz latex-HD groups were compared, apart from the group that received 1 drop of pure latex in water, which presented a significant increase (p < 0.05) in this parameter.


O látex extraído de Euphorbia tirucalli, planta conhecida popularmente como Aveloz, é utilizado em medicina complementar para induzir regressão tumoral. No entanto, como este látex tem efeitos tóxicos quando administrado por via oral em doses ponderais, este estudo foi desenhado para avaliar os efeitos de altas diluições do mesmo em camundongos sadios por um período de 18 semanas. As altas diluições do látex do Aveloz (látex-HD) foram obtidas através da interação de dois processos: diluição 1:100 em massa e sucussão, utilizando etanol 70% como solvente, nas diluições homeopáticas 5, 15 e 30cH, de acordo com a Famracopéia Homeopática Brasileira. Soluções de controle sem o látex (etanol-HD) foram compostas nas mesmas diluições e ministradas simultaneamente. Os animais que receberam látex-HD 30cH mostraram aumento significativo no consumo de alimento (p < 0,05) sem diferença significativa em ganho de peso. A respeito do consumo de água, não foram observadas diferenças significativas entre os diferentes grupos látex-HD, enquanto que o grupo que recebeu 1 gota de látex puro em água apresentou aumento significativo neste parâmetro (p < 0,05).


Subject(s)
Animals , Mice , Homeopathy , Latex , Homeopathic Remedy , Toxicology
11.
Rev. Soc. Bras. Med. Trop ; 40(4): 405-407, jul.-ago. 2007.
Article in English | LILACS | ID: lil-460244

ABSTRACT

Fractionation of Piper nigrum ethanol extract, biomonitored by assays on pyrethroid-resistant Aedes aegypti larvae yielded isolation of the larvicidal amides piperolein-A and piperine. Comparing LC50 values, the ethanol extract (0. 98 ppm) was the most toxic, followed by piperolein-A (1. 46ppm) and piperine (1. 53ppm).


O fracionamento do extrato etanólico de Piper nigrum biomonitorado por ensaios em larvas de Aedes aegypti resistentes a piretróides resultou no isolamento das amidas larvicidas piperoleína-A e piperina. Comparando-se os valores de CL50, o extrato etanólico (0. 98ppm) foi o mais tóxico, seguido pela piperoleína-A (1. 46ppm) e piperina (1. 53ppm).


Subject(s)
Animals , Aedes , Insecticides , Pyrethrins , Piper nigrum/chemistry , Insecticide Resistance , Larva , Plant Extracts
12.
Rev. bras. farmacogn ; 17(1): 8-13, jan.-mar. 2007. ilus, tab, graf
Article in English | LILACS | ID: lil-451558

ABSTRACT

The hypoglycemic activity of aqueous extracts from Bauhinia forficata L. and Bauhinia monandra Kurz leaves (10 percent w/v) was evaluated in normoglycemic mice. Both extracts have shown hypoglycemic activity using this methodology. It was also possible to isolate two flavonoids from B. forficata L., 3,7-di-O-alpha-rhamnopyranosylquercetin and 3,7-di-O-alpha-rhamnopyranosylkaempferol (kaempferitrin), whose structures were elucidated by usual NMR techniques. Only the quercetin derivative was identified in B. monandra aqueous extract by HPLC.


Extratos aquosos das folhas de Bauhinia forficata L. e Bauhinia monandra Kurz (10 por cento p/v) foram testados em camundongos normoglicêmicos, objetivando averiguar a sua atividade hipoglicemiante. Ambos os extratos mostraram atividade hipoglicemiante na metodologia empregada. Ainda, foi possível isolar de B. forficata L. dois flavonóides, quercetina-3,7-O-dirhamnosido e kaempferol-3,7-O-dirhamnosido, sendo as estruturas estabelecidas por técnicas clássicas de RMN. Apenas o derivado da quercetina foi identificado no extrato aquoso de Bauhinia monandra por CLAE.


Subject(s)
Mice , Bauhinia , Chromatography , Flavonoids , Hypoglycemia , Plant Extracts
13.
Rev. bras. farmacogn ; 16(1): 73-76, jan.-mar. 2006. tab
Article in Portuguese | LILACS | ID: lil-570960

ABSTRACT

A espécie Calceolaria chelidonioides (Scrophulariaceae), até então inédita nas citações científicas, foi estudada sob o ponto de vista farmacológico buscando-se identificar possíveis atividades antimicrobiana e antioxidante em metodologia in vitro. As partes aéreas dessa espécie demonstraram atividade antioxidante em modelo usando o radical livre DPPH. As flores de C. chelidonioides mostraram grande potencial antibacteriano frente à bactéria Staphylococcus aureus resistente a meticilina MRSA, um dos principais responsáveis em casos de infecção hospitalar.


The species Calceolaria chelidonioides (Scrophulariaceae), not scientific described so for, was studied in pharmacological aspects aiming to identify some anti-microbial and antioxidant activity. The aerial parts showed antioxidant activity using in vitro DPPH model. The flowers from C. chelidonioides showed strong antibacterial potential against meticiline resistant Staphylococcus aureus (MRSA) strains the main responsible for hospital infection complications.

14.
Rev. bras. farmacogn ; 15(4): 321-325, out.-dez. 2005. ilus, tab
Article in Portuguese | LILACS | ID: lil-570937

ABSTRACT

Do extrato butanólico de Croton campestris St. Hill. (Euphorbiaceae) foram isolados quatro flavonóides, todos O-glicosídeos da quercetina. Estas substâncias foram identificadas como 3-O-b-D-apiofuranosil-(1®2)-galactopiranosil quercetina (1), 3-O-b-D-galactopiranosil quercetina (hiperina) (2), 3-O-a-L-arabinopiranosil quercetina (guaijaverina) (3) e 3-O-a-L-ramnopiranosil quercetina (quercitrina) (4).O presente trabalho relata a presença destas substâncias pela primeira vez para esta espécie de Croton, cuja elucidação estrutural deu-se por espectroscopia em UV, EM e RMN, incluindo as técnicas bidimensionais: ¹H-¹H (2D NOESY, 2D COSY), ¹H-13C (2D HETCOR) e 13C (APT), além de comparações com os dados da literatura.


Four flavonoids were isolated from the butanolic extract of the aerial parts of Croton campestris St. Hill. (Euphorbiaceae). These compounds were identified as 3-O-b-D-apiofuranosyl-(1®2)-galactopyranoside quercetin (1), 3-O-b-D-galactopyranoside quercetin (hyperin) (2), 3-O-a-L-arabinopyranoside quercetin (guaijaverin) (3) and 3-O-a-L-ramnopyranoside quercetin (quercitrin) (4). They have been isolated for the first time from Croton campestris. Their structures were elucidated by UV, MS and NMR experiments including ¹H-¹H (2D NOESY, 2D COSY), ¹H-13C (2D HETCOR), 13C (APT) and by comparison of the spectral data with those reported in the literature.

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