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OC and OA concentrations (in mg/kg of fresh leaves) in extracts from undried (green) or fully dried (brown) Ligustrum vulgare leaves, collected on 30 May 2023, ground in aqueous solution at pH 6 (solid lines) or pH 8 (dashed lines). Leaf slurries had different holding time (0, 15, and 60 min) before solvent extraction. Each point represents the mean of three repetitions ± SEM.
