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HPLC chromatograms of caffeoylquinic acid derivatives detected from (A) first fully expanded leaf and (B) flower of sweet potato plant tissues. Peak 1: neochlorogenic acid, peak 2: caffeic acid, peak 3: chlorogenic acid, peak 4: 4-O-caffeoylquinic acid, peak 5: 4,5-di-O-caffeoylquinic acid, peak 6: 3,5-di-O-caffeoylquinic acid, peak 7: 3,4-di-O-caffeoylquinic acid, and peak 8: 3,4,5-tri-O-caffeoylquinic acid. HPLC = high performance liquid chromatography.
