ANTIOXIDANT ACTIVITYIN SOUTHERN BRAZIL HYPERICUM SPECIES

The present study was conducted to assess the antioxidant activity of Hypericum species endemic to South Brazil, H. caprifoliatum, H. carinatum, H. myrianthum and H. polyanthemum. The free radical scavenging properties of plant extracts were evaluated employing different methodologies, including the...

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Bibliographic Details
Published in:Journal of the Chilean Chemical Society 2008-12, Vol.53 (4), p.1658-1662
Main Authors: BERNARDI, A.P.M, LÓPEZ-ALARCÓN, C., ASPÉE, A, RECH, S.B, VON POSER, G.L, BRIDI, R, DUTRAFILHO, C. S, LISSI, E
Format: Article
Language:English
Subjects:
CHEMISTRY, MULTIDISCIPLINARY
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Summary:The present study was conducted to assess the antioxidant activity of Hypericum species endemic to South Brazil, H. caprifoliatum, H. carinatum, H. myrianthum and H. polyanthemum. The free radical scavenging properties of plant extracts were evaluated employing different methodologies, including the bleaching of a stable free radical (2,2-diphenyl-l-picrylhydrazyl, DPPH) and the peroxyl reactivity indexes TRAP (Total Reactive Antioxidant Potential) and ORAC-pyrogallol red (Oxygen Radicáis Absorbance Capacity). A fair correlation was found between total phenol content determined by Folin-Ciocalteau and DPPH consumption, both in crude methanol and n-hexane extracts. In particular, H. myrianthum and H. caprifoliatum showed the highest TRAP and ORAC-pyrogallol red values, respectively. This would imply that H. myrianthum contains a larger amount of antioxidants of lower reactivity.
ISSN:0717-9707
0717-9707
DOI:10.4067/S0717-97072008000400004