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HPLC profiles of methanolic extracts from four selected medicinal herbs: (A) phenolic acids, coumarins and flavonoids from aerial parts of Artemisia annua; (B) lignans and phenolic acid from fruits of Arctium lappa; (C) anthraquinones, stilbene and phenolic acid from rhizomes of Polygonum cuspidatum (tannins removed); and (D) flavonoids, phenolic acid and tannins from flowers of Rosa chinensis. Elution monitored at 250 nm (C), 280 nm (B and D), and 370 nm (A).
