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Chromatograms by HPLC-DAD at 280 nm of aqueous olive leaf extracts stored at 80 °C: (a) Day 0; (b) Day 6; (c) Day 14, where 1: oleuropein; 2: verbascoside; 3: hydroxyoleuropein; 4: hydroxytyrosol; 5: hydroxytyrosol hexoside; 6: glycosylated oleuropein derivative (545.1586 m/z [M − H]−experimental).
