ANTIOXIDANT POTENTIAL IN LIPOPHILIC AND HYDROPHILIC EXTRACTS FROM MEDICINAL HERBS (&lt;i&gt;SALVIA OFFICINALIS&lt;/i&gt; AND &lt;i&gt;ECHINACEA ANGUSTIFOLIA&lt;/i&gt;). A COMPARISON BETWEEN ASSAYS BASED ON ELECTRON PARAMAGNETIC RESONANCE AND SPECTROPHOTOMETRY
American journal of agricultural and biological sciences