A Carbon Paste Electrode Modified by Bentonite and l-Cysteine for Simultaneous Determination of Ascorbic and Uric Acids: Application in Biological Fluids.
Mohamed ChoukairiDounia BouchtaLoubna BounabElisa González RomeroMohamed AchacheKhalid DraouiFaiza ChaouketIhssane RaissouniMouad GharousPublished in: ChemistryOpen (2023)
A novel modification of a paste carbon electrode by Bentonite (Bent) and l-Cysteine (l-Cyst) was carried out for uric acid (UA) and ascorbic acid (AA) detection and quantification. Morphological and compositional characterization of the electrode surface were carried out using electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopic analysis (EDS). Cyclic voltammetry (CV) and square wave voltammetry (SWV) techniques were used to analyze UA and AA. The obtained sensor shows a good stability, sensibility, selectivity, and regeneration ability. Accordingly, the limit of detection (LOD) is found to be 0.031 μm and 9.6 μm for UA and AA, respectively. A good linearity in the range of 0.1 to 100 μm for UA and 10 to 1000 μm for AA was obtained. The peak-to-peak separation of UA-AA (ΔE UA-AA ) was determined to be 330 mV. In addition, the sensor is applied successfully to monitor UA and AA in serum samples.
Keyphrases
- electron microscopy
- uric acid
- simultaneous determination
- high resolution
- solid phase extraction
- stem cells
- metabolic syndrome
- liquid chromatography tandem mass spectrometry
- label free
- ionic liquid
- molecularly imprinted
- liquid chromatography
- loop mediated isothermal amplification
- magnetic resonance
- computed tomography
- molecular docking
- fluorescent probe
- single molecule
- molecular dynamics simulations
- high resolution mass spectrometry
- gas chromatography mass spectrometry