title: Quantitative determination of methemoglobin by measuring the solvent-water proton-nuclear magnetic resonance relaxation rate.
abstract: We report a new method for the quantitative determination of human methemoglobin (metHb) based on the measurement of the solvent-water proton-nuclear magnetic resonance (NMR) relaxation rate R1 [normalized to 1 mmol/L hemoglobin (Hb) concentration]. MetHb (%) is estimated from the linear dependence of R1 on the metHb concentration, taking into account the simple relationship [MetHb] = [(R1 - R1HbO2)/(R1metHb - R1HbO2)].100, where R1HbO2 and R1metHb are values for the solvent-water relaxation rate of standard 1.0 mmol/L solutions of the oxygenated derivative of human hemoglobin (HbO2) and of metHb, respectively. The minimum metHb that may be determined from the analysis of the experimental data is 0.5 +/- 0.4%.
authors.affiliation: Dipartimento di Chimica Inorganica, Università di Torino, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Aime
authors.forename: W
authors.initials: W
authors.lastname: Dastrú
authors.forename: M
authors.initials: M
authors.lastname: Fasano
authors.forename: A
authors.initials: A
authors.lastname: Arnelli
authors.forename: M
authors.initials: M
authors.lastname: Castagnola
authors.forename: B
authors.initials: B
authors.lastname: Giardina
authors.forename: P
authors.initials: P
authors.lastname: Ascenzi
mesh_terms: D042966:Cytochrome-B(5) Reductase / Q000172:deficiency; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D008706:Methemoglobin / Q000032:analysis*; D009599:Nitroprusside / Q000627:therapeutic use; D012997:Solvents; D014867:Water
chemical_list: D012997:Solvents; D014867:Water; D009599:Nitroprusside; D008706:Methemoglobin; D042966:Cytochrome-B(5) Reductase