Electrochemical sensing platform based on the use of ZnONPs and MWCNTs as CPE modifiers for a selective and sensitive determination of polyamine spermine in the urine sample

Abstract

A simple electroanalytical procedure has been developed for the determination of polyamine spermine using the ZnONPs‐MWCNTs‐CPE sensor. Spermine has been irreversibly oxidized on a modified electrode at a potential of +0.92 V versus Ag/AgCl (KCl, 3.5 mol L−1). The developed sensor demonstrated a respective linear response in borate buffer pH 8.5 from 2 μmol L−1 to 100 μmol L−1, with a detection limit of 0.300 μmol L−1 and quantification limit of 0.998 μmol L−1. The proposed sensor showed high reproducibility (RSD = 2.58 %), stability, robustness, and no obvious interference effects of several inorganic ions and organic molecules. The obtained results demonstrated excellent performance during the determination of the spermine in human urine samples with satisfactory recovery results (98.41–101.34 %), offering promising opportunities for practical clinical analysis.

Selective determination of nitrite in water and food samples using zirconium oxide (ZrO2)@MWCNTs modified screen printed electrode

“…For example, the synergistic integration of Au nanoparticles, Co-MOF and MWCNT as biosensors is used for the sensitive detection of low-concentration nitrite. 31,32 In addition, ZrO 2 is highly reactive with a large surface area, and offers a good distribution of particles in the composite. 33 Here, a novel nanocomposite consisting of ZrO 2 @MWCNTs was introduced as a new sensing platform for nitrite detection.…”