Determination of emodin in plasma by HPLC-MS and its pharmacokinetic study in rats / 中草药

ABSTRACT

Objective: To establish a method for determination of emodin in rat plasma by HPLC/Q-Exactive HR/MS, and to study the pharmacokinetics of emodin in normal rats and cerebral ischemia rats. Methods: The plasma concentration of emodin was determined by HPLC/Q-Exactive HRMS method with internal standard method. Emodin was eluted on a XBridgeTM C18 (150 mm × 2.1 mm, 5 μm) column with temperature at 30 ℃. The mobile phase consisted of 3 mmol/L ammonium acetate and methanol, with a gradient program as follows: 0~2 min (30% methanol), 2-10 min (30%-60% methanol), 10-13 min (60%-30% methanol). The flow rate was 0.3 mL/min, and the injection volume was 5 μL. MS experiments were coupled with the HPLC via HESI source operated in negative ionization full-scan mode. The pharmacokinetic parameters were calculated by the software of DAS 3.0. Results: The main pharmacokinetic parameters of emodin in normal rats and cerebral ischemia rats were as follows: AUC0-∞ were (605.63 ± 163.66) and (1 107.78 ± 191.11) ng∙h/mL, Cmax were (81.96 ± 20.72) and (91.65 ± 16.82) ng/mL, VZ/F were (851.03 ± 97.30) and (1 051.87 ± 119.88) L/kg, t1/2 were (10.31 ± 1.61) and (23.13 ± 3.56) h, tmax were (0.75 ± 0.22) and (0.75 ± 0.16) h. Conclusion: The method is simple, accurate, fast, sensitive, and suitable for the pharmacokinetic study of emodin in rats.