title: Simple and rapid quantification of gadolinium in urine and blood plasma samples by means of total reflection X-ray fluorescence (TXRF).
abstract: A simple and rapid method to determine gadolinium (Gd) concentrations in urine and blood plasma samples by means of total reflection X-ray fluorescence (TXRF) was developed. With a limit of detection (LOD) of 100 μg L(-1) in urine and 80 μg L(-1) in blood plasma and a limit of quantification (LOQ) of 330 μg L(-1) in urine and 270 μg L(-1) in blood plasma, it allows analyzing urine samples taken from magnetic resonance imaging (MRI) patients during a period of up to 20 hours after the administration of Gd-based MRI contrast agents by means of TXRF. By parallel determination of the urinary creatinine concentration, it was possible to monitor the excretion kinetics of Gd from the patient's body. The Gd concentration in blood plasma samples, taken immediately after an MRI examination, could be determined after rapid and easy sample preparation by centrifugation. All measurements were validated with inductively coupled plasma mass spectrometry (ICP-MS). TXRF is considered to be an attractive alternative for fast and simple Gd analysis in human body fluids during daily routine in clinical laboratories.
authors.affiliation: University of Münster, Institute of Inorganic and Analytical Chemistry, Corrensstrasse 30, 48149 Münster, Germany.
authors.forename: Lena
authors.initials: L
authors.lastname: Telgmann
authors.forename: Michael
authors.initials: M
authors.lastname: Holtkamp
authors.forename: Jens
authors.initials: J
authors.lastname: Künnemeyer
authors.forename: Carsten
authors.initials: C
authors.lastname: Gelhard
authors.forename: Marcel
authors.initials: M
authors.lastname: Hartmann
authors.forename: Annika
authors.initials: A
authors.lastname: Klose
authors.forename: Michael
authors.initials: M
authors.lastname: Sperling
authors.forename: Uwe
authors.initials: U
authors.lastname: Karst
mesh_terms: D000328:Adult; D005682:Gadolinium / Q000097:blood* / Q000652:urine*; D006801:Humans; D057230:Limit of Detection; D008297:Male; D013052:Spectrometry, X-Ray Emission / Q000191:economics / Q000379:methods*; D013997:Time Factors; D055815:Young Adult
chemical_list: D005682:Gadolinium