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Bol. latinoam. Caribe plantas med. aromát ; 20(3): 324-338, may. 2021. tab, ilus
Article in English | LILACS | ID: biblio-1343496


In this present study, we investigated the influence of various extraction methods including maceration, sonication, infusion, decoction, and microwave extraction, on the chemical and biological potential of phytochemicals extracted from three medicinal plants (Ageratum conyzoides, Plantago majorand Arctium lappa L). The results were subsequently analyzed by variance analysis. Our results suggested that sonication is the most effective extraction method among the five methods tested herein, for the extraction of phytochemicals that have a high antioxidant potential and high phenolic content. The three plants employed for this study had a high concentration of flavonoids and phenolics which was compatible with the chemosystematics of the species. All the samples possessed a Sun Protection Factor (SPF) of less than 6. Interestingly, a maximum reaction time of approximately 20 min was noted for the complexation of AlCl3 with the flavonoids present in the phytochemical extract during analyses of the kinetic parameters. We finally identified that the Ageratum conyzoides extract, prepared by sonication, possessed a significant pharmacological potential against hepatocarcinoma tumour cells, whose result can guide further studies for its therapeutic efficacy.

En el presente estudio, investigamos la influencia de varios métodos de extracción, incluyendo maceración, sonicación, infusión, decocción y extracción por microondas, sobre el potencial químico y biológico de los fitoquímicos extraídos de tres plantas medicinales (Ageratum conyzoides, Plantago majory Arctium lappa L). Los resultados se analizaron posteriormente mediante análisis de varianza. Nuestros resultados sugieren que la sonicación es el método de extracción más eficaz entre los cinco métodos aquí probados, para la extracción de fitoquímicos que tienen un alto potencial antioxidante y un alto contenido fenólico. Las tres plantas empleadas para este estudio tenían una alta concentración de flavonoides y fenólicos que era compatible con la quimiosistemática de las especies. Todas las muestras poseían un factor de protección solar (SPF) menor a 6. Curiosamente, se observó un tiempo máximo de reacción de aproximadamente 20 min para la complejación de AlCl3con los flavonoides presentes en el extracto fitoquímico durante los análisis de los parámetros cinéticos. Finalmente, identificamos que el extracto de Ageratum conyzoides, elaborado por sonicación, posee un importante potencial farmacológico frente a las células tumorales del hepatocarcinoma, cuyo resultado puede orientar nuevos estudios sobre su eficacia terapéutica.

Plants, Medicinal/chemistry , Phytochemicals/isolation & purification , Phenols/isolation & purification , Plantago/chemistry , Flavonoids/isolation & purification , Cell Survival , Analysis of Variance , Ageratum/chemistry , Arctium/chemistry
Rev. bras. farmacogn ; 19(2a): 358-365, Apr.-June 2009. graf, tab
Article in English | LILACS-Express | LILACS | ID: lil-524538


Bromelia antiacantha (known as wild banana) is traditionally used to treat coughs, as an emollient and antitussive, and to treat mouth and skin ulcers. To investigate the radical scavenger properties, DPPH and phosphomolybdenium were used, with low antioxidant activity being observed for both (below 5 mg/ml of extract presented no activity for both techniques). An HPLC fingerprint of phenolic compounds was developed and total phenolics through Folin-Ciocalteau method was an average of 500 µg/g of fresh fruits. Any cytotoxicity was observed on L929 fibroblasts cells for aqueous, methanol and lipid extracts between 500 and 0.01 µg/ ml. The wild banana extract (1000 µg/mL) shown a lower genotoxicity when compared to the negative and positive (MMS) controls. Abundant calcium oxalate crystals and sucrose were found and characterized through NMR and X-ray diffraction respectively. Its centesimal composition indicated abundant carbohydrates (45 percent) and lipids (18 percent). The carbohydrate analysis showed acidic monosaccharides, and the lipid analysis shown palmitic and linoleic acids in similar quantities (30 percent each) and oleic acid 20 percent, among others, through GC-FID. The viscosity of the water-soluble polysaccharide sub-fraction (5 g/L) was similar to that of water.

O chá dos frutos maduros de Bromelia antiacantha (banana-de-bugre; banana-do-mato) é usado tradicionalmente para tratar desordens respiratórias, como antitussígeno e também para tratar ulceras de pele e boca. Neste trabalho pesquisou-se o potencial de captação de radicais livres do extrato aquoso e extrato metanólico através da reação de redução do DPPH e do fosfomolibdenio, sendo encontrada baixa atividade nos dois modelos (abaixo de 5 mg/ml nenhuma atividade foi detectada em ambos extratos). Os compostos fenólicos totais foram determinados através de Folin-Ciocalteau, sendo encontrados 500 µg/g de fruto maduro fresco, e foi desenvolvido fingerprint dos compostos fenólicos através de CLAE-DAD. Nenhuma citotoxicidade foi observada em fibroblastos L929 para extratos aquoso, metanólico e lipídico entre 500 e 0,01 µg/ml, assim como baixa genotoxicidade (1000 µg/mL) quando comparados aos controles negativo e positivo (MMS). Abundantes cristais de oxalato de cálcio e de sacarose foram observados e caracterizados por RMN e difração de Raios-X respectivamente, e a composição centesimal do fruto indicou abundantes carboidratos (45 por cento) e lipídeos (18 por cento). A analise de carboidratos encontrou componentes monosacarídicos ácidos e foram encontrados acido palmítico e linoléico em quantidades similares (30 por cento cada) e 20 por cento de acido oléico, entre outros ácidos graxos através de CG-DIC. A viscosidade da sub-fração polissacarídica solúvel em água (5 g/L) foi semelhante a da água.