title: Quantification of isosorbide 5-mononitrate in human plasma by liquid chromatography-tandem mass spectrometry using atmospheric pressure photoionization.
abstract: Isosorbide 5-mononitrate (5-ISMN) is an organic nitrate widely used for its vasodilating properties in the treatment of angina pectoris. In the present study, an efficient, sensitive, robust method was developed for the determination and quantification of isosorbide 5-mononitrate, in human plasma, by liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS), using photospray ionization. Isosorbide 5-mononitrate was extracted from 0.5 mL human plasma by liquid-liquid extraction (LLE). The method had a chromatographic run of 2.0 min using a C(8) analytical column (100 mm x 2.1 mm i.d.) and the linear calibration curve over the range was linear from 20 to 2000 ng mL(-1) (r(2)>0.995). The between-run precision, based on the relative standard deviation replicate quality controls, was 7.9% (60 ng mL(-1)), 5.2% (300 ng mL(-1)) and 7.0% (1800 ng mL(-1)). The between-run accuracy was 94.9%, 94.1% and 88.8% for the above-mentioned concentrations, respectively. The method herein described was employed in a bioequivalence study of two tablet formulations of isosorbide 5-mononitrate 40 mg.
authors.affiliation: Faculty of Medical Sciences, State University of Campinas-UNICAMP, P.O. Box 6111, Campinas, SP, Brazil.
authors.forename: Lara C
authors.initials: LC
authors.lastname: Silva
authors.forename: Lina S O B
authors.initials: LS
authors.lastname: Oliveira
authors.forename: Gustavo D
authors.initials: GD
authors.lastname: Mendes
authors.forename: Gabriel
authors.initials: G
authors.lastname: Garcia
authors.forename: Alberto Dos Santos
authors.initials: Ados S
authors.lastname: Pereira
authors.forename: Gilberto
authors.initials: G
authors.lastname: De Nucci
mesh_terms: D001274:Atmospheric Pressure; D002853:Chromatography, Liquid / Q000379:methods*; D006801:Humans; D007548:Isosorbide Dinitrate / Q000031:analogs & derivatives* / Q000097:blood; D013058:Mass Spectrometry / Q000379:methods*; D010777:Photochemistry; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013810:Therapeutic Equivalency; D014665:Vasodilator Agents / Q000097:blood*
chemical_list: D014665:Vasodilator Agents; D007548:Isosorbide Dinitrate; C030397:isosorbide-5-mononitrate