Resumo

VALENCIA, Mónica et al. Extraction of fractions with anti-oxidant activity in Guadua angustifolia Kunth leaves. Rev Cubana Plant Med [online]. 2011, vol.16, n.4, pp. 364-373. ISSN 1028-4796.

Introduction: scientific reports show that bamboo leaves, mainly from Phyllostachys nigra, contains compounds with antioxidant activity suitable for food. Since Guadua angustifolia Kunt is the most important native bamboo genus in Colombia and tropical America, this study analyzed whether this species had compounds with antioxidant activity. Objective: to assess the influence of the technique, the solvent and the method of extraction in obtaining fractions with antioxidant activity from Guadua angustifolia Kunth (Poaceae) leaves. Methods: a completely randomized experimental design of blocks, was presented where the main blocking factor was the extraction technique (reflux, soxhlet, ultrasound), and as treatment was the solvent (50 % ethanol, ethyl acetate, diethyl ether). Additionally, a multiple comparison study was carried out to evaluate two extraction methods (direct and successive fractionning by polarity). The extractions were performed on dry, ground and grease-free leaves. The antioxidant activity was measured as the trapping capacity of radical derived from DPPH (2-2-diphenyl-1-picrylhydrazyl). Results: all the extracts show antioxidant activity. The application of different extraction techniques or methods did not show significant differences in the antioxidant activity figures, but did show statistical significance with respect to the used solvent. The antioxidant activity was lower in extracts from diethyl ether. Conclusions: the resulting extracts show antioxidant activity, in agreement with previously reported results for other bamboos.

Palavras-chave : Guadua angustifolia Kunth; bamboo; antioxidant activity.

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