Antioxidant activityin southern brazil hypericum species

• A.P.M BERNARDI ^[3] ; C. LÓPEZ-ALARCÓN ^[1] ; A ASPÉE ; S.B RECH ^[3] ; G.L VON POSER ^[3] ; R BRIDI ^[3] ; C. S DUTRAFILHO ^[4] ; E LISSI ^[2]
  1. [1] Pontificia Universidad Católica de Chile

     Pontificia Universidad Católica de Chile

     Santiago, Chile

     
  2. [2] Universidad de Santiago de Chile

     Universidad de Santiago de Chile

     Santiago, Chile

     
  3. [3] UFRGS Programa de Pós Graduação em Ciências Farmacêuticas
  4. [4] UFRGS Instituto de Ciências Básicas da Saúde Departamento de Bioquímica

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• Localización: Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química), ISSN-e 0717-6309, ISSN 0366-1644, Vol. 53, Nº. 4, 2008, págs. 1658-1662
• Idioma: inglés
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  • 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.