Determination of cnidilin and its two metabolites in rat bile and stool after oral administration by HPLC/electrospray ionization tandem mass spectrometry

• Published in: Biomedical chromatography 2013-04, Vol.27 (4), p.527-534
• Main Authors: Zhu, Hong, Ren, Yanping, Sun, Yingguang, Chang, Lu, Cao, Liang, Xu, Huijin, Zhang, Lantong
• Format: Article
• Language: English
• Subjects: Administration, Oral; Angelica - chemistry; Animals; Bile - chemistry; Bile - metabolism; Chromatography, High Pressure Liquid - economics; Chromatography, High Pressure Liquid - methods; cnidilin; determination; Drug Stability; Drugs, Chinese Herbal - administration & dosage; Drugs, Chinese Herbal - analysis; Drugs, Chinese Herbal - metabolism; excretion; Feces - chemistry; Heterocyclic Compounds, 3-Ring - administration & dosage; Heterocyclic Compounds, 3-Ring - analysis; Heterocyclic Compounds, 3-Ring - metabolism; HPLC-ESI-MS; Limit of Detection; Male; metabolites; Rats; Rats, Sprague-Dawley; Spectrometry, Mass, Electrospray Ionization - economics; Spectrometry, Mass, Electrospray Ionization - methods; Time Factors
• ISSN: 0269-3879; 1099-0801
• DOI: 10.1002/bmc.2827

ABSTRACT A simple, fast and sensitive method for the simultaneous determination of cnidilin and its two metabolites (M1 and M2) in rat bile and stool using HPLC coupled with electrospray ionization tandem mass spectrometry (HPLC‐ESI‐MS/MS) has been developed. The sample pretreatment was simple, because methanol was the only additive used for dilution of bile and ultrasound of stool. Pimpinellin was used as internal standard (IS). The separation was performed on a reverse phase C18 column with gradient elution consisting of 0.5‰ aqueous formic acid and methanol (containing 0.5‰ formic acid). The detection was in the multiple‐reaction monitoring mode within 7 min. All the analytes were in accordance with the requirement of the validation of the method in vivo (linearity, precision, accuracy, limit of detection and limit of quantification). After oral administrating 24 mg/kg of the prototype drug cnidilin, M1 and M2 were determined in bile within 36 h, and in stool within 60 h. Cnidilin in bile was completely excreted in 24 h, and the main excretive amount of cnidilin was 80% in the first 6 h, but the drug recovery in bile within 24 h was