title: A novel analysis method for diterpenoids in rat plasma by liquid chromatography-electrospray ionization mass spectrometry.
abstract: A sensitive, specific, and rapid liquid chromatography-mass spectrometry (LC-MS) method was developed and validated for analysis of lasiodonin, oridonin, ponicidin, and rabdoternin A in rat plasma using sulfamethoxazole as an internal standard (IS). The plasma samples were pretreated and extracted by liquid-liquid extraction. Chromatographic separation was performed on a C(18) column with linear gradient elution using water and methanol, both of which were acidified with 0.1% aqueous formic acid, at a flow rate of 0.8 ml/min. Detection was accomplished by scanning with multiple reaction monitoring (MRM) via an electrospray ionization (ESI) source. Higher sensitivity was achieved by setting three scanning periods in a novel detection mode. The optimized mass transition ion pairs (m/z) for quantitation were 365.3/347.3 for lasiodonin and oridonin, 361.2/343.2 for ponicidin, 363.2/283.1 for rabdoternin A, and 254.1/156.0 for IS. The total run time was 13.50 min between injections. The specificity, linearity, accuracy, precision, recovery, matrix effect, and several stabilities were validated for all analytes in the rat plasma samples. In conclusion, the validation results demonstrate that this method is robust and specific. The proposed method was further applied to investigate the pharmacokinetics of all analytes after a single oral administration of Isodon rubescens extract to rats.
authors.affiliation: Department of Pharmaceutical Analysis, School of Pharmacy, Hebei Medical University, Shijiazhuang, Hebei 050017, China.
authors.forename: Yingfeng
authors.initials: Y
authors.lastname: Du
authors.forename: Pengwei
authors.initials: P
authors.lastname: Liu
authors.forename: Xiaowei
authors.initials: X
authors.lastname: Shi
authors.forename: Yiran
authors.initials: Y
authors.lastname: Jin
authors.forename: Qiao
authors.initials: Q
authors.lastname: Wang
authors.forename: Xiaowei
authors.initials: X
authors.lastname: Zhang
authors.forename: Xiaona
authors.initials: X
authors.lastname: Sheng
authors.forename: Lantong
authors.initials: L
authors.lastname: Zhang
mesh_terms: D000284:Administration, Oral; D000818:Animals; D000890:Anti-Infective Agents / Q000097:blood / Q000493:pharmacokinetics; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004224:Diterpenes / Q000097:blood* / Q000493:pharmacokinetics; D045786:Diterpenes, Kaurane / Q000097:blood / Q000493:pharmacokinetics; D037602:Isodon / Q000737:chemistry; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D015203:Reproducibility of Results; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D013420:Sulfamethoxazole / Q000097:blood / Q000493:pharmacokinetics
chemical_list: D000890:Anti-Infective Agents; D004224:Diterpenes; D045786:Diterpenes, Kaurane; C011959:oridonin; C090365:ponicidin; D013420:Sulfamethoxazole