title: Simultaneous quantification of F2-isoprostanes and prostaglandins in human urine by liquid chromatography tandem-mass spectrometry.
abstract: A specific and sensitive LC-MS/MS method for analysis of F(2)-isoprostanes (F(2)-IsoPs) and prostaglandins (PGs) in urine was developed and validated to examine the levels of F(2)-IsoPs and prostaglandin F(2α) (PGF(2α)), in human urine in patients undergoing cardiac surgery. The rapid extraction for F(2)-IsoPs and PGs from urine was achieved using a polymeric weak anion solid phase extraction cartridge. The base-line separation of 8-iso-PGF(2α), 8-iso-15(R)-PGF(2α), PGF(2α), and 15(R)-PGF(2α) was carried out on a Hydro-RP column (250mm×2.0mm i.d., Phenomenex, CA) using a linear gradient of methanol:acetonitrile (1:1, v/v) in 0.1% formic acid at a flow rate of 0.2mL/min. The method was proved to be accurate and precise for simultaneous quantification of each analyte over a linear dynamic range of 0.05-50ng/mL with correlation coefficients greater than 0.99. The intra-day and inter-day assay precision at the lowest quality control (0.07ng/mL) level were less than 17%. The mean extraction recoveries of F(2)-IsoPs and PGs were in a range of 79-100%. In applications of this method to patients undergoing cardiac surgery, post-surgery urinary concentrations of 8-iso-PGF(2α) increased significantly in patients (n=14) who did not develop acute kidney (AKI) (pre-surgery 0.344±0.039 vs. post-surgery 0.682±0.094ng/mg creatinine, p<0.01), whereas there was no significant change in this isoprostane in the patients (n=4) who developed AKI (pre-surgery 0.298±0.062 vs. post-surgery 0.383±0.117ng/mg creatinine, NS). Therefore, the method is suitable for the analysis of individual F(2)-IsoPs and PGF(2α)'s in both clinical and research studies.
authors: Department of Pharmacology & Toxicology, University of Alabama at Birmingham, Birmingham, AL 35294, USA. jprasain@uab.edu
authors: Jeevan K
authors: JK
authors: Prasain
authors: Alireza
authors: A
authors: Arabshahi
authors: Pam R
authors: PR
authors: Taub
authors: Scott
authors: S
authors: Sweeney
authors: Ray
authors: R
authors: Moore
authors: J Daniel
authors: JD
authors: Sharer
authors: Stephen
authors: S
authors: Barnes
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods*; D028441:F2-Isoprostanes / Q000737:chemistry / Q000652:urine*; D006801:Humans; D011453:Prostaglandins / Q000737:chemistry / Q000652:urine*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D028441:F2-Isoprostanes; D011453:Prostaglandins