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GC-FID and HPLC chromatograms of essential oils and phenolics in peppermint extracts obtained by pressurized water extraction. a At 40 °C for 10 min. b At 130 °C for 10 min. Peaks for a and b are 1: Menthone; 2: Menthol. c At 130 °C for 10 min. Peaks for c are 1: Luteolin derivative 1; 2: Eriocitrin; 3: Luteolin derivative 2; 4: Luteolin derivative 3; 5: Rosmarinic acid
