BACKGROUND: Quantification of nitisinone, 2-(nitro-4-trifluoromethylbenzoyl)1,3-cyclohexanedione (NTBC) has been repeatedly described. Nevertheless monitoring of NTBC has not yet become part of routine therapy surveillance in tyrosinaemia type I (OMIM 276700). We developed a blood spot test to facilitate collection and transport of samples. Furthermore, the test material can be used for determination of other parameters like tyrosine and succinylacetone. METHOD: For quantification of NTBC in blood spots filter paper discs of 3.2mm diameter were extracted with 150 μL methanol containing mesotrione as internal standard (IS). Analysis was done by UPLC-MS/MS on a Xevo mass spectrometer (ESI+), (MRM). Parent ions were 330.05 for NTBC and 340.05 for IS, daughter ions were m/z 217.95 and m/z 125.95 for NTBC, and m/z 227.95 and m/z 103.95 for IS. RESULTS: The calibration curve for NTBC in blood spots was linear from 0.1 μmol/L to 100 μmol/L. Recovery exceeded 73.1%, CV intraday and interday were below 9.6%. Instrumental run time was 2.5 min. Sensitivity of the method was 0.1 μmol/L. NTBC concentrations in plasma were higher than in blood spots by a factor of 1.56 ± 0.13. CONCLUSION: As demonstrated in patients with tyrosinaemia type I quantification of NTBC by UPLC-MS/MS in blood spots is feasible and gives valuable information for monitoring NTBC treatment.
BACKGROUND: Quantification of nitisinone, 2-(nitro-4-trifluoromethylbenzoyl)1,3-cyclohexanedione (NTBC) has been repeatedly described. Nevertheless monitoring of NTBC has not yet become part of routine therapy surveillance in tyrosinaemia type I (OMIM 276700). We developed a blood spot test to facilitate collection and transport of samples. Furthermore, the test material can be used for determination of other parameters like tyrosine and succinylacetone. METHOD: For quantification of NTBC in blood spots filter paper discs of 3.2mm diameter were extracted with 150 μL methanol containing mesotrione as internal standard (IS). Analysis was done by UPLC-MS/MS on a Xevo mass spectrometer (ESI+), (MRM). Parent ions were 330.05 for NTBC and 340.05 for IS, daughter ions were m/z 217.95 and m/z 125.95 for NTBC, and m/z 227.95 and m/z 103.95 for IS. RESULTS: The calibration curve for NTBC in blood spots was linear from 0.1 μmol/L to 100 μmol/L. Recovery exceeded 73.1%, CV intraday and interday were below 9.6%. Instrumental run time was 2.5 min. Sensitivity of the method was 0.1 μmol/L. NTBC concentrations in plasma were higher than in blood spots by a factor of 1.56 ± 0.13. CONCLUSION: As demonstrated in patients with tyrosinaemia type I quantification of NTBC by UPLC-MS/MS in blood spots is feasible and gives valuable information for monitoring NTBC treatment.
Authors: Sebene Mayorandan; Uta Meyer; Gülden Gokcay; Nuria Garcia Segarra; Hélène Ogier de Baulny; Francjan van Spronsen; Jiri Zeman; Corinne de Laet; Ute Spiekerkoetter; Eva Thimm; Arianna Maiorana; Carlo Dionisi-Vici; Dorothea Moeslinger; Michaela Brunner-Krainz; Amelie Sophia Lotz-Havla; José Angel Cocho de Juan; Maria Luz Couce Pico; René Santer; Sabine Scholl-Bürgi; Hanna Mandel; Yngve Thomas Bliksrud; Peter Freisinger; Luis Jose Aldamiz-Echevarria; Michel Hochuli; Matthias Gautschi; Jessica Endig; Jens Jordan; Patrick McKiernan; Stefanie Ernst; Susanne Morlot; Arndt Vogel; Johannes Sander; Anibh Martin Das Journal: Orphanet J Rare Dis Date: 2014-08-01 Impact factor: 4.123
Authors: Hilde Laeremans; Charles Turner; Tommy Andersson; Jose Angel Cocho de Juan; Adam Gerrard; M Rebecca Heiner-Fokkema; Diran Herebian; Nils Janzen; Giancarlo la Marca; Mattias Rudebeck Journal: JIMD Rep Date: 2020-04-04