PHARMACOKINETICS, BIOAVAILABILITY, AND METABOLISM OF 2,3,5,4-TETRAHYDROXYSTILBENE-2-O-β-D-GLUCOSIDE IN RATS BY ULTRA-PERFORMANCE LIQUID CHROMATOGRAPHYQUADRUPOLE TIME-OF-FLIGHT MASS SPECTROMETRY AND HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY-ULTRAVIOLET DETECTION

2,3,5,4-tetrahydroxystilbene-2-O--D-glucoside (THSG), a natural product purified from the Chinese medical herb Polygoni multiflori Radix, has been demonstrated to possess many pharmacological activities, including antioxidant, anti-inflammatory, hepatoprotective, and antitumor properties. Ultra-performance liquid chromatographytime-of-flight mass spectrometry (UPLC-Q-TOF/MS) and high-performance liquid chromatography-ultraviolet detection (HPLC-UV) methods were developed for the pharmacokinetics, bioavailability, absorption, and metabolism studies of THSG in rats following a single intravenous or oral administration. The metabolites (M1 and M2) were identified in plasma by UPLC-Q-TOF/MS. The concentrations of the THSG in rat plasma, and bile, urine, or feces samples were determined by HPLC-UV. The results show THSG was rapidly absorbed within 30min in plasma. Absolute bioavailability of THSG was 40%. Total recovery of unchanged THSG within 24hr were low (0.041% in bile, 0.06% in feces), whereas the amount of unchanged THSG excreted in the urine within 24hr was lower than LLOQ.