Online extraction of antihypertensive drugs and their metabolites from untreated human serum samples using restricted access carbon nanotubes in a column switching liquid chromatography system - Faria, Henrique Dipe de; Bueno, Carolina Tosin; Krieger, Jose Eduardo; Krieger, Eduardo Moacyr; Pereira, Alexandre Costa; Santos, Paulo Caleb Júnior Lima; Figueiredo, Eduardo Costa (Journal of chromatography a, 2017)