Xanthine oxidase modified glassy carbon paste electrode

Xanthine Sensors Based on Anodic and Cathodic Detection of Enzymatically Generated Hydrogen Peroxide

“…Also, the detection of xanthine through the reduction process exhibited more selectivity than that obtained through the oxidation process. The lower detection limit of xanthine with a reduction process is comparable to a previously reported value [18].…”

Sensitive and selective xanthine amperometric sensors based on calcium carbonate nanoparticles

“…In most of conventional xanthine sensors, H 2 O 2 generated by xanthine oxidation was directly oxidized on the electrode [7,13]. The high overpotential for direct oxidation of H 2 O 2 necessitated sensor operation at potential more than 0.3 V, therefore the electroactive substances, especially uric acid and ascorbic acid, present, as impurities in samples are liable to interference with the assay.…”

“…XnOx-based electrochemical biosensors have been frequently used for the determination of xanthine [6][7][8][9][10][11][12][13]. Compared with other analytical techniques, such sensors possess simplicity of operation and the substrate selectivity of the enzymes.…”

Hypoxanthine Biosensor Based on Immobilization of Xanthine Oxidase on Modified Pt Electrode and Its Application for Fish Meat

“…The detection limit was found to be 6.5 × 10 -4 mM at the signal-to-noise ratio of 3 (S/N=3). The detection limit of XO-PVF-Pt as lower than those of modified glassy carbon paste electrode (5.3 × 10 -3 mM) [43], nafion-coated carbon fiber microelectrode (1.5 × 10 -3 mM) [2] but higher than those of nanocrystal gold-carbon paste electrode (2.2 × 10 -4 mM) [12] and polypyrrole-polyvinylsulphonate film (1.0 × 10 -4 mM) [44]. The current sensitivity is 82.55 µAmM -1 cm -2 to hypoxanthine for XO-PVF-Pt.…”