INVESTIGADORES
ZAMPINI Iris Catiana
congresos y reuniones científicas
Título:
SCAVENGING ACTIVITY OF NITROGEN ATOM-CENTERED FREE RADICAL BY PLANTS FROM EXTREME PLACES
Autor/es:
MESÓN GANA, J.; ZAMPINI I.C.; ORDÓÑEZ, R.; SAYAGO, J.; NIEVA MORENO, M.I.; ISLA, M.I.
Lugar:
Tafí del Valle - Tucumán
Reunión:
Jornada; Jornadas de Biología; 2005
Resumen:
Previously, we demonstrated that the plant species which growth in Puna, Argentina (Baccharis incarum, Baccharis boliviensis, Chuquiraga atacamensis, Parastrephia lucida) show high scavenger capacity on oxygen free radicals (ROS). In present work, we evaluated the antioxidant activity of these plant ethanolic extracts on DPPH radical (1,1-difenil-2-picrylhydrazyl) and ABTS.+ cation (2,2`-azinobis (3-ethylbenzothiazoline-6 sulfonic acid). The results were expressed as the trolox equivalent antioxidant capacity (TEAC, µmol Trolox equivalents/100 g dry weight).  The phytochemistry pattern by TLC and phenolic compound and flavonoid contents were also analyzed.  The TEAC values ranged from 14706 for P. lucida to 4167 for C. atacamensis. A positive relationship between phenolic compounds and antioxidant activity was observed. IC50 values for DPPH scavenger show that P. lucida was the most active extract. Our results demonstrated that these plant species are potential sources of natural antioxidant compounds for multiple biotechnological uses.