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HPLC-PDA chromatograms of (A,B) 60% ethanol and (B,C) propylene glycol extracts from (A,C) untreated (control) and (B,D) PEF-treated (Eopt =3 kV/cm; WT, opt = 20 kJ/kg) vanilla pods. Peak identification: unidentified compound (6); vanillin (7).
