An efficient platform based on cupper complex-multiwalled carbon nanotube nanocomposite modified electrode for the determination of uric acid

A new voltammetric sensor for determination of uric acid (UA) by Cuppercomplex- multiwalled carbon nanotube (Cu-complex-CNT) nanocomposite modifiedcarbon paste electrode (CPE) is reported. The electrocatalytic behavior of theCu-complex-CNT nanocomposite modified CPE was studied in pH 2.0 phosphatebuffer solution by chronoamperometry (CA) and cyclic voltammetry (CV) in thepresence of uric acid. Due to the excellent electrocatalytic activity, enhancedelectrical conductivity and high surface area of the Cu-complex-CNT, determinationof uric acid with well-defined peaks was achieved at the Cu-complex-CNT modifiedelectrode. The catalytic peak current obtained, was linearly dependent on theUA concentrations in the range of 0.66 – 350.0μM with sensitivity of 0.05 μAμM-1. The detection limits for UA were 0.075μM, The diffusion coefficient for theoxidation of UA at the modified electrode was calculated as (4.1±0.05) ×10−5 cm2s−1. The proposed sensor was successfully examined in real sample analysis withurine and human serum and revealed stable and reliable recovery data.