High performance liquid chromatographic (HPLC) fingerprints of organic and conventional sweet basil leaf samples. Peaks 1, 2, 3, 4, 5, 6, 7, 10 and 12 were luteolin 5-O-glucoside, caffeic acid derivative, caffeic acid, rutin, chicoric acid, kaempferol 3-O- maonylglucoside, luteolin acetyl-glucuronide, rosmarinic acid, and ursolic acid, respectively. The peaks before 3 min were recognized as solvent or ghost peaks.