title: Determination of quinapril and quinaprilat in human plasma by ultraperformance liquid chromatography-electrospray ionization mass spectrometry.
abstract: A novel, specific and sensitive ultraperformance liquid chromatography tandem mass spectrometry (UPLC-MS/MS) method was developed for the simultaneous determination of quinapril and its active metabolite quinaprilat in human plasma. The method involves a simple, one-step extraction procedure coupled with an Acquity UPLC BEH C(18 )column (100 x 2.1 mm, i.d., 1.7 microm) with isocratic elution at a flow-rate of 0.2 mL/min and lisinopril as the internal standard. Detection was performed on a triple-quadrupole tandem mass spectrometer in multiple reaction monitoring mode via electrospray ionization. Using 250 microL plasma, the methods were validated over the concentration range 5.010-500.374 ng/mL for quinapril and 10.012-1000 ng/mL for quinaprilat, with a lower limit of quantification of 5.010 ng/mL for quinapril and 10.012 ng/mL for quinaprilat. The intra- and inter-day precision and accuracy were within 10.0%. The recovery was 85.8, 62.6 and 61.3% for quinapril, quinaprilat and lisinopril, respectively. Total run time was 3.0 min only.
authors.affiliation: Department of Chemistry, Pilvai Science college, Pilvai, Vijapur, Gujarat State, India. bdasandi@rediffmail.com
authors.forename: Bhavesh
authors.initials: B
authors.lastname: Dasandi
authors.forename: Sanjay
authors.initials: S
authors.lastname: Shah
mesh_terms: D002853:Chromatography, Liquid / Q000191:economics / Q000379:methods*; D006801:Humans; D017706:Lisinopril / Q000097:blood; D000077583:Quinapril; D012015:Reference Standards; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000191:economics / Q000379:methods*; D053719:Tandem Mass Spectrometry / Q000191:economics / Q000379:methods*; D044005:Tetrahydroisoquinolines / Q000097:blood*; D013997:Time Factors
chemical_list: D044005:Tetrahydroisoquinolines; C054501:quinaprilat; D017706:Lisinopril; D000077583:Quinapril