Journal of Bioequivalence & Bioavailability

Antonio Sergio Silveira

Publications

• Research Article
  Hydroxocobalamin Quantification in Human Plasma by High-Performance Liquid Chromatography Coupled with Electrospray Tandem Mass Spectrometry in a Pharmacokinetic Study
  Author(s): Gustavo D. Mendes, Fabiana D. Mendes, Marinalva Ferreira Sampaio, Antonio Sergio Silveira, Lu Shi Chen, Khalid M. Alkharfy and Gilberto De Nucci Gustavo D. Mendes, Fabiana D. Mendes, Marinalva Ferreira Sampaio, Antonio Sergio Silveira, Lu Shi Chen, Khalid M. Alkharfy and Gilberto De Nucci
  
  A rapid, sensitive and specific method for quantifying hydroxocobalamin in human plasma using paracetamol as the internal standard (IS) is described. The analyte and the IS were extracted from plasma by liquid-liquid extraction using an organic solvent (ethanol 100%; -20°C). The extracts were analyzed by high performance liquid chromatography coupled with electrospray tandem mass spectrometry (HPLC-MS-MS). Chromatography was performed on Prevail C8 3 μm, analytical column (2.1×100 mm i.d.). The method had a chromatographic run time of 3.4 min and a linear calibration curve over the range 5-400 ng.mL-1 (r>0.9983). The limit of quantification was 5 ng.mL-1. The method was also validated without the use of the internal standard. The precision in the intra-batch validation with IS was 9.6%, 8.9%, 1.0% and 2.8% whereas without IS was 9.2%, 8.2%, 1.8% and 1... View More»
  DOI: 10.4172/jbb.1000139

  Abstract PDF