ABSTRACT
Objective: To establish an HPLC method for the determination of four triterpene constituents (dehydrotumulosic acid, polyporenic acid C, 3-epi-dehydropachymic acid, and dehydropachymic acid) in Guizhi Fuling Capsules (GFC). Methods: Chromatography conditions were Diamonsic C18 column (250 mm × 4.6 mm, 5 μm), system mobile phase was composed of acetonitrile (A)-0.2% HCOOH aqueous solution (C) in a linear gradient elution mode (0-70 min: 50%-85% A; 70-80 min: 85%-100% A; 80-90 min: 100% A), detective wavelength was set at 242 nm, and column temperature was 40℃. Results: The calibration curve was linear within 0.408-2.04 μg/mL (r = 0.999 9), 0.192-0.96 μg/mL (r = 0.999 5), 0.078-0.39 μg/mL (r = 0.999 5), and 0.075 6-0.378 μg/mL (r = 0.999 5) for dehydrotumulosic acid, polyporenic acid C, 3-epi-dehydropachymic acid, and dehydropachymic acid, respectively. The average recoveries were 97.5% (RSD = 1.4%, n = 5), 98.5% (RSD = 1.6%, n = 5), 97.2% (RSD = 1.2%, n = 5), and 102.3% (RSD = 1.8%, n = 5). Six batches of GFC sample were determined, The average contents of dehydrotumulosic acid, polyporenic acid C, 3-epi-dehydropachymic acid, and dehydropachymic acid were 0.070, 0.015, 0.030, and 0.061 mg/capsule, separately. Conclusion: The method is simple, accurate, and can be used as a quality control method for GFC.