title: Development of SPME method for concomitant sample preparation of rocuronium bromide and tranexamic acid in plasma.
abstract: A high-throughput method using solid-phase microextraction coupled to liquid chromatography-tandem mass spectrometry (SPME-LC-MS/MS) for determination of tranexamic acid and rocuronium bromide in human plasma was developed and validated. Standard analytical approaches employ acidification of the sample due to the instability of rocuronium bromide in collected plasma samples. However, acidification affects the binding equilibrium of the drug and consequently no information on the free/bound concentration can be obtained. Contrary to these protocols, the proposed method requires minimum sample handling and no ion pairing and/or derivatization procedure. A weak cation exchange coating was chosen as the best extracting phase for selected drugs, guaranteed a good recovery, minimum carry-over, reusability and reproducibility. SPME procedure met all Food and Drug Administration acceptance criteria for bioanalytical assays at three concentration levels, for both selected drugs. Post-extraction addition experiments showed that matrix effect was less than ±3%. Here, a weak cation exchange thin-film solid-phase microextraction (WCX TF-SPME) approach is presented, offering effective cleanup procedure and full quantitation of the drugs in plasma, undoubtedly one the most challenging matrices with regards to its complexity. In addition, the 96-well plate format of WCX TF-SPME system provides considerable advantages, such as high throughput analysis for up to 96 samples in 35min (22s/sample), requirement of small amounts of plasma samples (0.8mL), and a simple sample preparation protocol, all of which shows a promise for possible on-site application in hospitals to monitor concentrations of the drugs in close to real time.
authors: Department of Chemistry, University of Waterloo, Waterloo, ON, Canada N2L 3G1; Department of Medicinal Chemistry, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Toruń, Jurasza 2, 85-089 Bydgoszcz, Poland.
authors: Krzysztof
authors: K
authors: Gorynski
authors: Department of Chemistry, University of Waterloo, Waterloo, ON, Canada N2L 3G1; Department of Medicinal Chemistry, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Toruń, Jurasza 2, 85-089 Bydgoszcz, Poland.
authors: Barbara
authors: B
authors: Bojko
authors: Department of Anesthesia and Pain Management, Toronto General Hospital, Toronto, ON, Canada M5G 2C4.
authors: Michael
authors: M
authors: Kluger
authors: Department of Anesthesia and Pain Management, Toronto General Hospital, Toronto, ON, Canada M5G 2C4; Department of Anesthesia, Faculty of Medicine, University of Toronto, Canada.
authors: Angela
authors: A
authors: Jerath
authors: Department of Anesthesia and Pain Management, Toronto General Hospital, Toronto, ON, Canada M5G 2C4; Department of Anesthesia, Faculty of Medicine, University of Toronto, Canada.
authors: Marcin
authors: M
authors: Wąsowicz
authors: Department of Chemistry, University of Waterloo, Waterloo, ON, Canada N2L 3G1. Electronic address: janusz@uwaterloo.ca.
authors: Janusz
authors: J
authors: Pawliszyn
mesh_terms: D000732:Androstanols / Q000097:blood* / Q000737:chemistry*; D002853:Chromatography, Liquid / Q000379:methods*; D006801:Humans; D015203:Reproducibility of Results; D000077123:Rocuronium; D052617:Solid Phase Microextraction / Q000379:methods*; D053719:Tandem Mass Spectrometry / Q000379:methods*; D014148:Tranexamic Acid / Q000097:blood* / Q000737:chemistry*
chemical_list: D000732:Androstanols; D014148:Tranexamic Acid; D000077123:Rocuronium
keywords: Liquid chromatography–mass spectrometry; Quaternary ammonium drug; Rocuronium bromide; Tranexamic acid; Weak cation exchange solid-phase microextraction (WCX-SPME)