Journal
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
Volume 828, Issue 1-2, Pages 55-61Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jchromb.2005.09.029
Keywords
schizandrin; plasma; LC/MS; solid phase extraction (SPE); pharmacokinetics
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A sensitive liquid chromatography-mass spectrometric (LC/MS) method for the quantification of shizandrin in rat plasma was developed and validated after solid-phase extraction (SPE). Chromatographic separation was achieved on a reversed-phase Shimadzu C 18 column with the mobile phase of acetonitrile-sodium acetate (10 mu mol/L) and step gradient elution resulted in a total run time of about 11.7 min. The analytes were detected using an electrospray positive ionization mass spectrometry in the selected ion monitoring (SIM) mode. A good linear relationship was obtained in the concentration range studied (0.005-2.000 mu g/mL) (r = 0.9999). Lower limit of quantification (LLOQ) was 5 ng/mL and the lower limit of detection (LLOD) was 2 ng/mL using 100 mu L plasma sample. Average recoveries ranged from 75.85 to 88.51% in plasma at the concentrations of 0.005, 0.100 and 1.000 mu g/mL. Intra- and inter-day relative standard deviations were 5.95-12.93% and 3.87-14.53%, respectively. This method was successfully applied for the pharmacokinetic studies in rats. (c) 2005 Elsevier B.V. All rights reserved.
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