Abstract:
ETHNOPHARMACOLOGICAL RELEVANCE:Semen Cassiae, called Juemingzi in China, is the seed of the annual Cassia obtusifolia L., of the leguminosae family. It has been used as healthy drinks to alleviate constipation and improve eyesight for many years in China. AIM OF THE STUDY:A simple sensitive UHPLC-MS/MS method has been developed and validated for the simultaneous determination and pharmacokinetic study of chrysophanol, emodin, aloe-emodin, rhein, physcion, obtusifolin and aurantio-obtusin in rat plasma. MATERIALS AND METHODS:Chromatographic separation was accomplished on a C18 column with a 5min gradient elution. A tandem mass spectrometric detection was conducted using multiple reaction monitoring (MRM) via an electrospray ionization (ESI) source and operating in the negative ionization mode. The samples were prepared by LLE with ethyl acetate after being spiked with an internal standard (butylparaben). RESULTS:The current UHPLC-MS/MS assay was validated for linearity, intra-day and inter-day precisions, accuracy, extraction recovery and stability. The method was linear for all analytes over investigated range with all correlation coefficients greater than 0.9900. The lower limit of quantification (LLOQ) of each analyte was lower than 5ng/mL. Intra-day and inter-day precisions were less than 14.99%. The relative errors of accuracies were in the range of -14.60% to 5.11%. The mean recoveries and matrix effects of anthraquinones were higher than 65.54% and 93.26%, respectively. After oral administration 1.25g/kg of Semen Cassiae extract, the maximum plasma concentration (Cmax) was 1189.25±333.40ng/mL for chrysophanol, 38.48±3.15ng/mL for emodin, 79.20±34.76ng/mL for aloe-emodin, 152.70±23.91ng/mL for rhein, 461.85±266.77ng/mL for physcion, 243.59±22.71ng/mL for obtusifolin and 1950.44±638.86ng/mL for aurantio-obtusin, respectively. The time to reach the maximum plasma concentration (Tmax) was 0.333±0.071h for chrysophanol, 0.333±0.059h for emodin, 0.333±0.009h for aloe-emodin, 0.333±0.09h for rhein, 0.167±0.002h for physcion, 0.5±0.074h for obtusifolin and 0.333±0.06h for aurantio-obtusin, respectively. CONCLUSION:The proposed method was further applied to investigate the pharmacokinetics of seven anthraquinones after oral administration of Semen Cassia extract to rats.
journal_name
J Ethnopharmacoljournal_title
Journal of ethnopharmacologyauthors
Yang C,Wang S,Guo X,Sun J,Liu L,Wu Ldoi
10.1016/j.jep.2015.04.008subject
Has Abstractpub_date
2015-07-01 00:00:00pages
305-13eissn
0378-8741issn
1872-7573pii
S0378-8741(15)00259-7journal_volume
169pub_type
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