[Determination of N6-(4-hydroxybenzyl) adenine riboside in rat plasma by ultra performance liquid chromatography-quadrupole time of flight mass spectrometry].

An ultra performance liquid chromatography-quadrupole time of flight mass spectrometry (UPLC-QTOF-MS) method was developed and validated for the determination of N6-(4-hydroxybenzyl) adenine riboside and its pharmacokinetics in rat plasma. The chromatographic conditions were optimized. The separation was performed on an Agilent ZORBAX SB-C18 column(150 mm x 3 mm, 1.8 μm) with a gradient elution of 0.2% (v/v) formic acid aqueous solution and acetonitrile as the mobile phases at a flow rate of 0.35 mL/min. The detection was accomplished in positive mode with electrospray ionization (ESI) by UPLC-QTOF-MS, and 6-benzylamino purine was used as the internal standard (IS). The results showed that the linear range of calibration curve was 0.625-160 ng/mL for N6-(4-hydroxybenzyl) adenine riboside in rat plasma with the correlation coefficient more than 0.99. The recoveries were 88.41%-108.26%. The limit of detection was 0.1 ng/mL. The intra-day and inter-day precisions (RSDs) were less than 6%, and intra-day and inter-day accuracies (REs, RE = (measured concentration-spiked concentration)/spiked concentration x 100%) were less than ±15%. The method is rapid, sensitive and accurate for the quantitation of N6-(4-hydroxybenzyl) adenine riboside, which can be used for the study of pharmacokinetics of N6-(4-hydroxybenzyl) adenine riboside.