Fracionamento bioguiado de baccharis trimera visando a atividade anti-inflamatória

AUTOR(ES)

Cristiane Bernardes de Oliveira

DATA DE PUBLICAÇÃO

2009

RESUMO

Baccharis trimera (Less.) DC. (Asteraceae), popularly known as ¿carqueja¿, is native to America and it is widely used in traditional medicine for gastrointestinal treatments, for liver diseases, as digestive and to anti-inflammatory purposes. It presented accumulation of flavones, flavonols and diterpenes. Several studies have been performed to study its anti-inflammatory and antimicrobial activities. Considering this, we initiated the fractionation of B. trimera extract in order to identify the fraction or compounds responsible for its anti-inflammatory activity. From the aerial parts of B. trimera it were obtained the fractions: dichloromethane, ethyl acetate, n-butanol, aqueous and also saponins and flavonoids fractions. All fractions were characterized by TLC. These six fractions were evaluated for the anti-inflammatory activity using the carrageenan-induced pleurisy, as a model of acute inflammation via i.p. The following parameters were determined in the pleural fluid: the exudate volume, total leukocyte count, cytological differences, protein concentration and determination of NO. All tested fractions decreased significantly the analyzed parameters when compared to the carrageenan group (ANOVA, P <0.05), showing potential antiinflammatory activity. The determination of total phenols and antioxidant activity were evaluated by the Folin-Ciocalteu spectrophotometric assay and by the radical 2.2- diphenyl-1-picryl-hidrazil (DPPH¿) method, respectively. The flavonoid and ethyl acetate fractions (1 mg / ml) showed high antioxidant potential that were similar (ANOVA, P <0.05) from that of the reference substances: vitamin C, quercetin and luteolin in the same concentrations, thus suggesting that the antioxidant activity of these fractions is due to the presence of flavonoids. The phytochemical studies and the identification of potential antioxidant and anti-inflammatory activities of B. trimera, will contribute to the chemical differentiation of Baccharis species and also it should support the development of a drug with anti-inflammatory and antioxidant activity.

ASSUNTO(S)

atividade antioxidante anti-inflammatory pleurisy baccharis trimera carqueja atividade antiinflamatória antioxidant baccharis trimera asteraceae

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