Abstract
Tamarixetin and kaempferide, the major bioactive constituents of Xiheliu extract, have been simultaneously/quantitatively determined in rat plasma and urine by a sensitive high performance liquid chromatography method after oral administration the total flavonoids from Xiheliu. In this study, the biological samples were prepared by solid-phase extraction, then simultaneously detected at 254 nm and successfully separated and quantified using a reversed-phase C18 column with methanol-formic acid aqueous gradient solution, at a flow rate of 1 mL/min. Good linearity (r > 0.989) of tamarixetin was observed in plasma and urine with the calibration ranges both at 1.6–80 μg/mL. For kaempferide, the correlation coefficient reached 0.994 in plasma at 1.4–70 μg/mL. The RSD of intra- and inter-day were 1.9–6.5% for tamarixetin and 1.3–9.0% for kaempferide in plasma; in urine, the intra- and inter-day RSD for not only tamarixetin but also kaempferide was no more than 7.4 and 5.8%, respectively. The lowest extraction recovery was 87.6% for kaempferide and 93.2% for tamarixetin in plasma and urine for both low and high concentrations. Due to the high sensitivity (the LOQ for tamarixetin was 1.2 μg/mL and for kaempferide 1.4 μg/mL), accuracy, precision, and good selectivity, the assay was successfully applied to pharmacokinetic studies of both flavonols in rats. The half-lives of tamarixetin and kaempferide were 17.8 ± 1.4 and 92.5 ± 1.6 min, and the c max were 3.1 ± 0.2 and 2.5 ± 0.4 μg/mL, respectively.
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Xu, F., Guan, H., Feng, Y. et al. Determination of tamarixetin and kaempferide in rat plasma and urine by high-performance liquid chromatography. J Anal Chem 69, 574–582 (2014). https://doi.org/10.1134/S106193481406015X
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DOI: https://doi.org/10.1134/S106193481406015X