Savournin et al. reported concentrations of oleuropein in four French varieties (Cailletier, Lucques, Tanche, and Verdale-Picholine hybrid) with Lucques having the highest concentration (12.56-14.16%) . These values were higher than usually reported, and was ascribed to the microwave drying method rather than the extraction procedure. Other authors found between 9% and 14.3% oleuropein in leaves of olive trees depending on the harvest time and agronomic conditions . Notable differences and Tunisia . Similar studies found significant differences in oleuropein concentrations among olive varieties of Italian and Portuguese cultivars .