Electrochemical method for detection of aspartame in beverage using Pd modified single walled carbon nanotubes sensor (PdNPs/SWCNTs)

This study revealed synthesis and application of Pd nanoparticles (PdNPs) on single walled carbon nanotubes (SWCNTs) as aspartame sensors in beverage samples through the electrochemical analyses. SWCNTs were synthesized by chemical vapor deposition method and then Pd NPs covered on the carboxylated SWNT walls. SEM and XRD studies were used to characterize the morphology and crystalline structure of prepared films which exhibited Pd NPs that have been randomly decorated on the CNT sheets. Electrochemical characterization of PdNPs/SWCNTs as aspartame sensor was performed through cycle voltammetry (CV) measurements which indicated that the linear sensing range, detection limit and sensitivity were obtained 1 to 120 mu M, 0.001 mu M and 0.29587 mu A/mu M, respectively. The comparison of prepared electrode performance with other reported aspartame sensing systems showed the lower obtained detection limit value on PdNPs/SWCNTs. Selectivity and interference response of prepared aspartame sensors was studied in presence of different substances in electrochemical cells. The applicability, accuracy and precision of the PdNPs/SWCNTs were also evaluated for aspartame determination in the prepared beverage as a real sample. The results showed the recovery values range was from 86.5% to 93.4% and relative standard deviations values were lower than 4.21% which illustrated acceptable accuracy and precision measurements on the PdNPs/SWCNTs.