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Structures and UPLC chromatogram of EEG. (A) Structures of compounds 1–8. (B) UPLC chromatogram of EEG. The detection wavelength was as follows: 0–7 min, 238 nm; 7–20 min, 440 nm. UPLC, ultra performance liquid chromatography; EEG, ethanol extract of gardenia fruits; 1, gardenoside; 2, 6β-hydroxy geniposide; 3, geniposidic acid; 4, geniposide; 5, crocin-1; 6, crocin-2; 7, crocin-3; 8, crocin-4.
