EPR investigation of antioxidant characteristics of some irradiated natural extracts

The aim of the present work is to study the antioxidant characteristics of some irradiated natural extracts, like white Seaberry (Hippophae Rhamnoides) and Spirulina (Spirulina Platensis) using EPR (Electron Paramagnetic Resonance) spectroscopy technique. The methods used in this research concern the utilization of stable free radicals from nitrone classes, like nitroxide radical Ternpol (2,26,6-tetramethy1-4-hydroxypipetidine-oxyl) and spin trap PBN (N-t-Butyl- aphenylnitrone). The purpose is to see which are the changes induced in antioxidant activity by irradiation process, depending on irradiation absorbed doses. For low adsorbed doses was observed an increasing of antioxidant activity for all studied samples.