Simultaneous determination of three β-blockers at a carbon nanofiber paste electrode by capillary electrophoresis coupled with amperometric detection

► Carbon nanofibers were produced by electrospinning technique. ► A carbon nanofiber paste electrode was fabricated by this electrospun material. ► This electrode was firstly used as a sensitive amperometric detector in CE. ► Proposed method was applied to determine three β-blockers in human urine.