HPLC fingerprint of 10 batches of Lintong Jingpitian PPPs samples (A) and the reference fingerprint of Lintong Jingpitian PPPs. HPLC conditions—column: Agilent
Zorbax SB-C18 column (5 lm, 4.6 250 mm); mobile phase: (A) deionized-glacial acetic acid (99:1, v/v, pH 3.0), (B) methanol; gradient program: 5–44% B (0–70 min), 44–
44% (70–80 min); flow rate: 1.0 mL/min; detection wavelength: 280 nm; temperature: 30 C; injection volume: 20 lL.