Fig. 4From: “Quantity-effect” research strategy for comparison of antioxidant activity and quality of Rehmanniae Radix and Rehmannia Radix Praeparata by on-line HPLC-UV-ABTS assayThe potencies of the chromatographic peaks in the Dihuang and Shu Dihuang samples. a Dihuang, b Shu DihuangBack to article page