Each herb was analyzed by the HPLC system using an Agilent 1260 Infinity system (Agilent Technologies, USA) with detection at 254 nm. A 4.6×100 mm diameter, 3.5 μm particle size C18 column (Agilent Technologies, USA), a flow rate of 0.7-1 mL/min, and injection volume of 10 μL were used for this experiment. The mobile phase was a gradient elution of 2% acetic acid in deionized water and methanol with different system (Table 1). The appropriate HPLC system was validated following by the Practice of ICH Guidance.