title: Quantitative Fourier transform ion cyclotron resonance mass spectrometry--the determination of creatinine by isotope dilution mass spectrometry.
abstract: Accurate quantitation has been demonstrated on many different types of mass spectrometer. However, quantitative applications of Fourier transform ion cyclotron resonance mass spectrometry (FTICRMS) have been limited. In this study, the quantitative potential of FTICRMS has been investigated using an exact matching isotope dilution method for the determination of creatinine in serum. Creatinine is an important clinical biomarker and its measurement is used as an assessment of renal function. The quantitation of creatinine was selected because a high-accuracy high-performance liquid chromatography/mass spectrometry (HPLC/MS) determination using a triple quadrupole mass spectrometer has already been successfully developed in-house. Therefore, a direct comparison of the quantitative capability of FTICRMS could be made against an established method. The accuracy of the quantitation of creatinine was found to be equivalent to that obtained using LC/MS. However, the expanded measurement uncertainty (k = 2) was larger, at 6%, when using FTICRMS compared with 1% when using HPLC/MS with the triple quadrupole mass spectrometer.
authors.affiliation: LGC, Queens Road, Teddington TW11 0LY, UK. tony.bristow@lgc.co.uk
authors.forename: Tony
authors.initials: T
authors.lastname: Bristow
authors.forename: Peter
authors.initials: P
authors.lastname: Stokes
authors.forename: Gavin
authors.initials: G
authors.lastname: O'Connor
mesh_terms: D002851:Chromatography, High Pressure Liquid; D003404:Creatinine / Q000097:blood*; D017357:Cyclotrons; D007553:Isotope Labeling; D007677:Kidney Function Tests; D015203:Reproducibility of Results; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods* / Q000706:statistics & numerical data
chemical_list: D003404:Creatinine