title: Simultaneous and sensitive determination of xanthotoxin, psoralen, isoimpinellin and bergapten in rat plasma by liquid chromatography-electrospray ionization mass spectrometry.
abstract: A sensitive, specific and rapid liquid chromatography-mass spectrometry (LC-MS) method has been developed and validated for the simultaneous determination of xanthotoxin (8-methoxypsoralen), psoralen, isoimpinellin (5,8-dimethoxypsoralen) and bergapten (5-methoxypsoralen) in rat plasma using pimpinellin as an internal standard (IS). The plasma samples were pretreated by protein precipitation with methanol and chromatographic separation was performed on a C(18) column with a mobile phase composed of 1 mmol ammonium acetate and methanol (30:70, v/v). The detection was accomplished by multiple-reaction monitoring (MRM) scanning via electrospray ionization (ESI) source operating in the positive ionization mode. The optimized mass transition ion-pairs (m/z) for quantitation were 217.1/202.1 for xanthotoxin, 187.1/131.1 for psoralen, 247.1/217.0 for isoimpinellin, 217.1/202.1 for bergapten, and 247.1/231.1 for IS. The total run time was 6 min between injections. The calibration curves were linear over the investigated concentration range with all correlation coefficients higher than 0.998. The lower limits of quantitation (LLOQ) of these analytes were less than 1.21 ng/ml. The intra- and inter-day RSD were no more than 9.7% and the relative errors were within the range of -8.1% to 4.5%. The average extraction recoveries for all compounds were between 90.7% and 106.2%. The proposed method was further applied to the determination of actual plasma samples from rats after oral administration of Radix Glehniae extract.
authors.affiliation: Department of Pharmaceutical Analysis, School of Pharmacy, Hebei Medical University, 361 Zhongshan East Road, Shijiazhuang 050017, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Yang
authors.forename: Chao
authors.initials: C
authors.lastname: Feng
authors.forename: Dezhi
authors.initials: D
authors.lastname: Kong
authors.forename: Xiaowei
authors.initials: X
authors.lastname: Shi
authors.forename: Yang
authors.initials: Y
authors.lastname: Cui
authors.forename: Man
authors.initials: M
authors.lastname: Liu
authors.forename: Qiao
authors.initials: Q
authors.lastname: Wang
authors.forename: Yongli
authors.initials: Y
authors.lastname: Wang
authors.forename: Lantong
authors.initials: L
authors.lastname: Zhang
mesh_terms: D000078223:5-Methoxypsoralen; D000818:Animals; D019661:Apiaceae / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005363:Ficusin / Q000097:blood* / Q000302:isolation & purification; D011564:Furocoumarins / Q000097:blood* / Q000302:isolation & purification; D016014:Linear Models; D008730:Methoxsalen / Q000031:analogs & derivatives* / Q000097:blood* / Q000302:isolation & purification; D051381:Rats; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D011564:Furocoumarins; C015304:isopimpinellin; D000078223:5-Methoxypsoralen; D005363:Ficusin; D008730:Methoxsalen