Sensitive determination of uric acid at layered zinc hydroxidesodium dodecyl sulphate-propoxur nanocomposite

An electrochemical chemical sensor for the determination of uric acid (UA) with high sensitivity and a wide working range was fabricated using the layered zinc hydroxide-sodium dodecyl sulphate-propoxur (LZH-SDS-PRO) nanocomposite, modified with multiwall carbon nanotubes (MWCNT). The introduction of LZH-SDS-PRO as a conducting matrix has enhanced the conductivity of MWCNT. The morphology of LZH-SDS-PRO/MWCNT was characterized by transmission electron microscopy (TEM) and scanning electron microscopy (SEM), while electrochemical behavior of UA and K3[Fe(CN)6] at LZH-SDS-PRO/MWCNT paste electrode was studied by square wave and cyclic voltammetry, respectively. Under the optimized experimental conditions, the electrode established linear plot for UA concentrations 7.0 mol L^-1 to 0.7 mmol L^-1 (R² = 0.9920) and LOD was calculated to be 4.28 µmol L^-1 (S/N = 3). The fabricated LZH-SDS-PRO/MWCNT electrode was successsfully applied to urine samples, exhibiting excellent stability and reproducibility, which made it worthwhile for analytical applications.