Fig. 4From: Infrared-assisted extraction followed by high performance liquid chromatography to determine angoroside C, cinnamic acid, and harpagoside content in Scrophularia ningpoensisRepresentative HPLC chromatogram of the standard solution at middle concentration (a) and real sample extracted from S. ningpoensis (b). 1 = angoroside C; 2 = cinnamic acid; 3 = harpagosideBack to article page