Ferrocene‐Functionalized Multiwalled Carbon Nanotubes for the Simultaneous Determination of Dopamine, Uric Acid, and Xanthine

Abstract

In this proof‐of‐concept study, ferrocene‐modified multiwalled carbon nanotubes (Fc‐MWCNT) were synthesized by amide coupling and the resulting product was characterized by transmission electron microscopy and Fourier‐transform infrared spectroscopy. The Fc‐MWCNT were used in a graphite paste electrode (GPE) for the highly sensitive simultaneous determination of dopamine (DA), uric acid (UA), xanthine (XA) by differential pulse voltammetry. The sensor displayed a linear range up to 4.5, 14, and 82.0 μM with a limit of detection of 2.0, 10.0 and 5 nM for DA, UA, and XA, respectively. In addition, the modified GPE/Fc‐MWCNT displayed a high stability, reproducibility, and repeatability. The GPE/Fc‐MWCNT was used for simultaneous determination of DA, UA, and XA in two different real samples with a recovery rate of 95–104 %.

A highly sensitive Zr-MOF mediated multi-enzyme cascade platform for the colorimetric and fluorescent dual-signal determination of sarcosine

“…The decrease in the slope could be attributed to kinetic limitations. 37 Calculated by the equation LOD = 3 σ / k , the LOD of sarcosine was 0.44 μM. And the LOQ of sarcosine was 1.45 μM.…”

Selective non-enzymatic uric acid sensing in the presence of dopamine: electropolymerized poly-pyrrole modified with a reduced graphene oxide/PEDOT:PSS composite

“…[40][41][42] Previously, several important studies have addressed the development of the simultaneous detection of uric acid and dopamine using modified electrodes. [43][44][45][46][47] Nevertheless, to the best of our knowledge, there is still a real need for the development of a selective uric acid sensor in the presence of dopamine. A new development is demonstrated here based on an imprinted polymer on the ErGO/PEDOT:PSS modified electrode.…”