Fig. 3From: Infrared-assisted extraction followed by high performance liquid chromatography to determine angoroside C, cinnamic acid, and harpagoside content in Scrophularia ningpoensisEffects of the experiment parameters on extraction yield of angoroside C, cinnamic acid and harpagoside from S. ningpoensis in IRAE (n = 3). a Effects of solvent. Ratio of solid/liquid: 1:25; illumination time: 10 min; the distance: 3 cm. b Effects of solid/liquid ratio. Extraction solvent: 37.5% ethanol solution; illumination time: 10 min; the distance: 3 cm. c Effects of illumination time. Extraction solvent: 37.5% ethanol solution; Ratio of solid/liquid: 1:25; the distance: 3 cm. d Effects of distance between the IR lamp and glass flask. Extraction solvent: 37.5% ethanol solution; Ratio of solid/liquid: 1:25; illumination time: 10 minBack to article page