Assuntos
Abrasão Química/métodos , Óleo de Cróton/administração & dosagem , Ceratolíticos/administração & dosagem , Fenóis/administração & dosagem , Envelhecimento da Pele/efeitos dos fármacos , Óleo de Cróton/química , Método Duplo-Cego , Estabilidade de Medicamentos , Face , Feminino , Humanos , Ceratolíticos/química , Fenóis/química , Fotografação , Pele/diagnóstico por imagem , Pele/efeitos dos fármacos , Tensoativos/administração & dosagem , Tensoativos/química , Resultado do TratamentoRESUMO
CONTEXT: Croton sp. are plants with a well-reported antimicrobial activity. Croton limae A.P. Gomes, M.F. Sales P.E. Berry (Euphorbiaceae), known as 'marmeleiro-prateado', is commonly used to manage abdominal pain in Brazil. OBJECTIVE: This work evaluates the phytochemical composition, antimicrobial and modulatory activities of the essential oil of C. limae leaves (EOCL). MATERIALS AND METHODS: The minimum inhibitory concentration (MIC) and the modulation of the antibiotic activity were determined using a microdilution method. The concentration of EOCL ranged between 512 and 8 µg/mL. Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumonia, Candida tropicalis, C. krusei and C. albicans strains were used in the MIC and modulation assays. The antibiotics, amikacin, gentamicin and neomycin, and the antifungals, amphotericin B, benzoylmetronidazole and nystatin, were used in concentrations ranging between 2500 and 2.5 µg/mL. The phytochemical analysis of the EOCL was performed through gas chromatography coupled to a mass spectrometer (GC/MS). RESULTS: Only Staphylococcus aureus was inhibited by a clinically relevant concentration of EOCL (MIC 512 µg/mL). Synergism between the EOCL and amikacin against S. aureus (9.76 µg/mL) and E. coli (39.062 µg/mL); neomycin against E. coli (2.44 µg/mL); and benzoylmetronidazole against C. krusei (256 µg/mL) were observed. The GC/MS analysis identified cedrol, eucalyptol and α-pinene as the main compounds of EOCL. CONCLUSION: EOCL inhibited the growth of S. aureus and potentiated the antibiotic and antifungal effects of drugs against all bacterial and Candida strains, respectively.
Assuntos
Antibacterianos/química , Antifúngicos/química , Óleo de Cróton/química , Croton , Antibacterianos/isolamento & purificação , Antibacterianos/farmacologia , Anti-Infecciosos/química , Anti-Infecciosos/isolamento & purificação , Anti-Infecciosos/farmacologia , Antifúngicos/isolamento & purificação , Antifúngicos/farmacologia , Candida albicans/efeitos dos fármacos , Candida albicans/fisiologia , Óleo de Cróton/isolamento & purificação , Óleo de Cróton/farmacologia , Fármacos Dermatológicos/química , Fármacos Dermatológicos/isolamento & purificação , Fármacos Dermatológicos/farmacologia , Escherichia coli/efeitos dos fármacos , Escherichia coli/fisiologia , Humanos , Testes de Sensibilidade Microbiana , Folhas de Planta , Staphylococcus aureus/efeitos dos fármacos , Staphylococcus aureus/fisiologiaRESUMO
ABSTRACT: Marmeleiros are popularly known for the medicinal properties ascribed to their essential oils. This research aimed to analyze the essential oil of leaves from three Croton species (Croton argyrophylloides, Croton jacobinensis, and Croton sincorensis), to verify whether the daily time and harvest season in the year may interfere with their essential oils performance and composition. From each species, 1,500g of green leaves were harvested in Viçosa do Ceará - CE, at 6am and 12pm, during both dry and rainy seasons. Essential oil extraction was conducted by the method of water vapor drag and chemical profile was analyzed by gas chromatography-mass spectrometry (GC/MS). The highest yield was obtained at 12pm in the dry season for C. argyrophylloides and C. jacobinensis, and at 6am in the rainy season for C. sincorensis. Bicyclogermacrene demonstrated higher relative abundance in C. argyrophylloides (28.09 to 30.59%), C. jacobinensis (25.2 to 30.14%), and C. sincorensis (23.86 and 21.71%), and the only exception was at 6am in C. sincorensis, where (E)-caryophyllene was the most abundant compound (25.34%). The yield and composition of the studied species were influenced by rainfall, temperature, and sunlight, presenting statistical significant differences between the different periods studied. The species produce constituents with specific biological properties; and therefore, they can be used as a natural source.(AU)
RESUMO: Marmeleiros são conhecidos popularmente pelas suas ações medicinais presentes em seus óleos essenciais. A pesquisa objetivou analisar o óleo essencial de folhas de três espécies de Croton (Croton argyrophylloides, Croton jacobinensis, and Croton sincorensis), a fim de verificar se os horários e períodos do ano causam diferenças no rendimento e na composição. Foram coletadas 1500g de folhas verdes de cada espécie em Viçosa do Ceará - CE, às 6 e 12 horas, no período das estações seca e das chuvas. A extração ocorreu pelo método de arraste a vapor de água e a composição foi analisada por cromatografia gasosa acoplada a espectrometria de massa (CG/EM). O maior rendimento de C. argyrophylloides e C. jacobinensis foi no período seco às 12h, e de C. sincorensis foi no período chuvoso às 6h. O biciclogermacreno apresentou maior concentração em C. argyrophylloides (28,09 a 30,59%), C. jacobinensis (25,2 a 30,14%) e C. sincorensis (23,86 e 21,71%), com exceção do C. sincorensis às 6h sendo o majoritário o (E)-cariofileno (25,34 %). O rendimento e a composição das espécies estudadas foram influenciadas pela pluviosidade, temperatura e incidência solar, apresentando diferença estatística entre os horários estudados. As espécies produzem constituintes com propriedades biológicas específicas, podendo ser utilizadas como fonte natural dos mesmos.(AU)
Assuntos
Croton , Óleo de Cróton/química , Óleos Voláteis/análise , EuphorbiaceaeRESUMO
ABSTRACT: Marmeleiros are popularly known for the medicinal properties ascribed to their essential oils. This research aimed to analyze the essential oil of leaves from three Croton species (Croton argyrophylloides, Croton jacobinensis, and Croton sincorensis), to verify whether the daily time and harvest season in the year may interfere with their essential oils performance and composition. From each species, 1,500g of green leaves were harvested in Viçosa do Ceará - CE, at 6am and 12pm, during both dry and rainy seasons. Essential oil extraction was conducted by the method of water vapor drag and chemical profile was analyzed by gas chromatography-mass spectrometry (GC/MS). The highest yield was obtained at 12pm in the dry season for C. argyrophylloides and C. jacobinensis, and at 6am in the rainy season for C. sincorensis. Bicyclogermacrene demonstrated higher relative abundance in C. argyrophylloides (28.09 to 30.59%), C. jacobinensis (25.2 to 30.14%), and C. sincorensis (23.86 and 21.71%), and the only exception was at 6am in C. sincorensis, where (E)-caryophyllene was the most abundant compound (25.34%). The yield and composition of the studied species were influenced by rainfall, temperature, and sunlight, presenting statistical significant differences between the different periods studied. The species produce constituents with specific biological properties; and therefore, they can be used as a natural source.
RESUMO: Marmeleiros são conhecidos popularmente pelas suas ações medicinais presentes em seus óleos essenciais. A pesquisa objetivou analisar o óleo essencial de folhas de três espécies de Croton (Croton argyrophylloides, Croton jacobinensis, and Croton sincorensis), a fim de verificar se os horários e períodos do ano causam diferenças no rendimento e na composição. Foram coletadas 1500g de folhas verdes de cada espécie em Viçosa do Ceará - CE, às 6 e 12 horas, no período das estações seca e das chuvas. A extração ocorreu pelo método de arraste a vapor de água e a composição foi analisada por cromatografia gasosa acoplada a espectrometria de massa (CG/EM). O maior rendimento de C. argyrophylloides e C. jacobinensis foi no período seco às 12h, e de C. sincorensis foi no período chuvoso às 6h. O biciclogermacreno apresentou maior concentração em C. argyrophylloides (28,09 a 30,59%), C. jacobinensis (25,2 a 30,14%) e C. sincorensis (23,86 e 21,71%), com exceção do C. sincorensis às 6h sendo o majoritário o (E)-cariofileno (25,34 %). O rendimento e a composição das espécies estudadas foram influenciadas pela pluviosidade, temperatura e incidência solar, apresentando diferença estatística entre os horários estudados. As espécies produzem constituintes com propriedades biológicas específicas, podendo ser utilizadas como fonte natural dos mesmos.
Assuntos
Croton , Euphorbiaceae , Óleo de Cróton/química , Óleos Voláteis/análiseRESUMO
Introducción: el género Croton que pertenece a la familia Euphorbiaceae, se caracteriza porque sus especies poseen una gran cantidad de usos a nivel etnobotánico. Esta información ha sido validada por los relatos ancestrales y los reportes bibliográficos que se han encontrado en los últimos cuarenta años. Se ubican muy cerca de la región del trópico y se encuentran distribuidas en Centroamérica, Suramérica, Asía y norte de África, de allí que se pueden observar los innumerables usos que tiene y que han llevado a profundizar en el estudio de las especies del género en estudio. Objetivos: realizar una búsqueda organizada, que permita reconocer el valor etnobotánico de especies del género Croton a nivel mundial, con el fín de determinar su valor e importancia medicinal. Métodos: fueron revisadas varias bases de datos, libros especializados y demás reportes bibliográficos relacionados con el uso tradicional de especies del género Croton y composición química. Resultados: la información de esta revisión, puede servir como base preliminar y como justificación en investigaciones relacionadas con la búsqueda de compuestos químicos del tipo flavonoide y diterpeno. Conclusiones: se evidenció de acuerdo al análisis de los datos obtenidos y la información obtenida en la presente revisión, que las especies del género Croton se caracterizan porque poseen un sinnúmero de usos en la medicina tradicional y popular(AU)
Introduction: The genus Croton Euphorbiaceae belonging to the family, is characterized by its species have a lot of uses ethnobotanical level, this information has been validated by the ancestral stories and bibliographic reports have been found in the last forty years, these species are located very close to the tropics and are distributed mainly in Central America, South America, Asia and north Africa, from there you can observe the many uses it has and which have led to further study of the genus study. Objectives: Perform an organized search, which allows recognizing the value ethnobotanical species of Croton worldwide, in order to determine its value and medicinal importance. Methods: Were revised several databases, specialized books and other bibliographic reports related to the traditional uses of species of Croton and chemical composition. Results: The information presented in this review may serve as a preliminary basis and as justification in research related to the search for chemical compounds specifically flavonoids and diterpenes. Conclusions: The results obtained in this review showed the evidence according to the analysis of the data and total information presented, that the genus Croton are characterized by has a wide use in traditional and folk medicine(AU)
Assuntos
Óleo de Cróton/uso terapêutico , Óleo de Cróton/química , ColômbiaRESUMO
Croton zehntneri (Euphorbiaceae) is a native aromatic plant from Northeast region of Brazil. The monoterpenoid estragole (ESL) has been isolated by classical chromatographic methods from the essential oil (EO) of C. zehnteneri leaves and characterized by GC-FID and GC-MS, its antimicrobial and cytotoxic potentials being assessed. The analysis of the EO enabled the identification of 100% of the integrated constituents, of which yield was about 1.8%. The main components identified were: eucalyptol, estragole (84.7%) and spathulenol. The dosage of 50 µg/disk of ESL presented fairly significant zones of inhibition against Gram-positive bacteria and fungi. The ESL presented toxicity against Artemia salina with LC50 and LC90 of 4,54 and 8,47 µg mL-1. However, in tumor inhibition assays (human cells), there were no rewarding inhibition in any of the human cancer cell lines (MCF-7, HEP-2 and NCI-H292).
Assuntos
Anisóis/farmacologia , Anti-Infecciosos/farmacologia , Antineoplásicos Fitogênicos/farmacologia , Óleo de Cróton/química , Cicloexanóis/farmacologia , Euphorbiaceae/química , Monoterpenos/farmacologia , Óleos Voláteis/química , Derivados de Alilbenzenos , Anisóis/isolamento & purificação , Anti-Infecciosos/isolamento & purificação , Linhagem Celular Tumoral/efeitos dos fármacos , Cicloexanóis/isolamento & purificação , Testes de Sensibilidade a Antimicrobianos por Disco-Difusão , Ensaios de Seleção de Medicamentos Antitumorais , Eucaliptol , Euphorbiaceae/classificação , Fungos/efeitos dos fármacos , Cromatografia Gasosa-Espectrometria de Massas , Bactérias Gram-Negativas/efeitos dos fármacos , Bactérias Gram-Positivas/efeitos dos fármacos , Humanos , Monoterpenos/isolamento & purificaçãoRESUMO
AIMS: The effects of the essential oil of Croton zehntneri (EOCz) and its major components anethole, estragole and methyl eugenol were evaluated in phenylephrine precontracted rat corpora cavernosa (RCC). MAIN METHODS: RCC strips were mounted in 5 ml organ baths for isometric recordings of tension, precontracted with 10 µM phenylephrine and exposed to test drugs. KEY FINDINGS: All major compounds relaxed RCC. The order of potency was estragole>anethole>methyl eugenol. The maximal relaxation to EOCz and methyl eugenol was 62.67% (IC50 of 1.67 µM) and 45.8% (IC50 of 1.7 µM), respectively. Estragole relaxed RCC with an IC50 of 0.6 µM (maximal relaxation-76.6%). The maximal relaxation to estragole was significantly reduced by L-NAME (43.46%-IC50 of 1.4 µM), ODQ (53.11%-IC50 of 0.83 µM) and indomethacin (24.41%-IC50 of 1.3 µM). On the other hand, anethole relaxed RCC by 66.73% (IC50 of 0.96 µM) and this relaxation was blunted by indomethacin (35.65%-IC50 of 1.6 µM). Both estragole and anethole increased the relaxation achieved upon electrical stimulation. Both compounds increased the levels of cAMP (estragole by 3-fold and anethole by 2-fold when compared to controls). Estragole also increased the levels of cGMP (0.5-fold). SIGNIFICANCE: The higher potency of these compounds to relax corpora cavernosa smooth muscle may form the pharmacological basis for the use of such substances as leading compounds in the search of alternative treatments of erectile dysfunction.
Assuntos
Anisóis/farmacologia , Óleo de Cróton/química , Croton/química , Contração Isométrica/efeitos dos fármacos , Músculo Liso/efeitos dos fármacos , Agentes Urológicos/farmacologia , Derivados de Alilbenzenos , Animais , Colforsina/farmacologia , Óleo de Cróton/farmacologia , AMP Cíclico/metabolismo , GMP Cíclico/metabolismo , Masculino , Relaxamento Muscular/efeitos dos fármacos , Músculo Liso/fisiologia , Óxido Nítrico/metabolismo , Pênis/efeitos dos fármacos , Pênis/fisiologia , Fenilefrina/farmacologia , Piperazinas/farmacologia , Extratos Vegetais/química , Purinas/farmacologia , Ratos , Ratos Wistar , Citrato de Sildenafila , Sulfonas/farmacologia , Técnicas de Cultura de TecidosRESUMO
Croton argyrophylloides Muell. Arg. is widely used in Brazilian folk medicine to treat diabetes and venereal diseases. This study examined the acute toxicity and cytotoxicity of the essential oil of C. argyrophylloides (EOCA). In addition, vascular effects of the EOCA have been examined. In mice, an oral acute toxicity test revealed that EOCA could be considered as a non toxic essential oil since it showed a very high LD50 (9.84 +/- 0.01 g/kg). In the brine shrimp (Artemia salina) cytotoxic assay, the LC50 value of EOCA was 275 [165-534] microg/mL. EOCA (1-1000 microg/mL) relaxed isolated endothelium-intact aortic rings precontracted with phenylephrine with an IC50 value of 126.7 [89.8-163.7] microg/mL. In rat mesenteric bed preparations precontracted with phenylephrine, EOCA (1-300 microg/mL) also induced a reversible, vasodilator effect with an IC50 value of 46.0 [33.3-58.7] micro/mL. It is concluded that EOCA is a very interesting agent from the point of view of the possibility of therapeutic application. This is because, whilst showing a very small acute toxicity, EOCA also showed maximal efficacy as a vascular antispasmodic agent with a pharmacological potency similar to that of other Croton species essential oils.
Assuntos
Óleo de Cróton/farmacologia , Óleo de Cróton/toxicidade , Croton/química , Óleos Voláteis/farmacologia , Óleos Voláteis/toxicidade , Vasodilatadores/farmacologia , Animais , Aorta Torácica/efeitos dos fármacos , Artemia , Brasil , Óleo de Cróton/química , Feminino , Dose Letal Mediana , Masculino , Camundongos , Contração Muscular/efeitos dos fármacos , Óleos Voláteis/química , Extratos Vegetais/química , Extratos Vegetais/farmacologia , Extratos Vegetais/toxicidade , Ratos , Ratos Wistar , Circulação Esplâncnica/efeitos dos fármacos , Vasodilatadores/químicaRESUMO
The chemical composition of the leaf essential oil of Croton regelianus collected from wild plants growing in two different sites at Ceará State (Brazil) was analyzed by GC/MS and GC-FID. Twenty monoterpenoids, representing more than 96% of the chemical composition of the oils, were identified and quantified. The oils showed similar chemical composition but considerable variation in the levels of each constituent. Ascaridole (33.9-17.0%), p-cymene (22.3-21.6%), and camphor (13.0-3.1%) were the predominant constituents. The monoterpene ascaridole was isolated and characterized by spectroscopic data. The essential oils and the isolated compounds were tested against Aedes aegypti and Artemia sp. larvae, and the root knot nematode Meloidogyne incognita. The bioassay results show that the essential oil of C. regelianus and ascaridole were moderately active against the M. incognita, but strongly effective against both A. aegypti and Artemia sp. larvae.
Assuntos
Aedes/efeitos dos fármacos , Antinematódeos/química , Óleo de Cróton/química , Croton/química , Inseticidas/química , Folhas de Planta/química , Animais , Antinematódeos/isolamento & purificação , Antinematódeos/farmacologia , Cromatografia Gasosa , Óleo de Cróton/isolamento & purificação , Óleo de Cróton/farmacologia , Monoterpenos Cicloexânicos , Inseticidas/isolamento & purificação , Inseticidas/farmacologia , Larva/efeitos dos fármacos , Dose Letal Mediana , Monoterpenos/química , Monoterpenos/isolamento & purificação , Monoterpenos/farmacologia , Nematoides/efeitos dos fármacos , Peróxidos/química , Peróxidos/isolamento & purificação , Peróxidos/farmacologiaRESUMO
1. The effects of the essential oil of Croton nepetaefolius (EOCN) and its major constituent, 1,8-cineole, on the compound action potential (CAP) of nerve were investigated. 2. Experiments were performed in sciatic nerves dissected from Wistar rats, mounted in a moist chamber and stimulated at a frequency of 0.2 Hz, with electric pulses of 100 micros duration at 20-40 V. Evoked CAP were displayed on an oscilloscope and recorded on a computer. The CAP control parameters were as follows: peak-to-peak amplitude 8.1 +/- 0.6 mV (n = 15); conduction velocity 83.3 +/- 4.2 m/s (n = 15); chronaxie 58.0 +/- 6.8 msec (n = 6); and rheobase 2.8 +/- 0.1 V (n = 6). 3. Lower concentrations of EOCN (100 and 300 microg/mL) and 1,8-cineole (153 and 307 microg/mL; i.e. 1 and 2 mmol/L, respectively) had no significant effects on CAP control parameters throughout the entire recording period. However, at the end of 180 min exposure of the nerve to the drug, peak-to-peak amplitude was significantly (P < 0.05) reduced to 27.4 +/- 6.7 and 1.7 +/- 0.8% of control values by 500 and 1000 microg/mL EOCN, respectively (n = 6), and to 76.5 +/- 4.4, 70.0 +/- 3.9 and 14.8 +/- 4.1% of control values by 614, 920 and 1227 microg/mL (i.e. 4, 6 and 8 mmol/L) 1,8-cineole, respectively (n = 6). Regarding conduction velocity, at the end of the 180 min exposure period, this parameter was significantly reduced to 85.8 +/- 7.3 and 48.7 +/- 12.3% (n = 6) of control values by 500 and 1000 microg/mL EOCN, respectively, and to 86.4 +/- 4.5 and 76.1 +/- 5.2% (n = 6) by 920 and 1227 microg/mL 1,8-cineole, respectively. Chronaxie and rheobase were significantly increased by the higher concentrations of both EOCN and 1,8-cineole. 4. It is concluded that EOCN and its main constituent 1,8-cineole block nerve excitability in a concentration-dependent manner, an effect that was totally reversible with 1,8-cineole but not with EOCN. This suggests that other constituents of EOCN, in addition to 1,8-cineole, may contribute to the mediation of this effect of EOCN.