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A moderate enhancement of electroanalytical sensitivity for the determination of urea at EG-Ag-Z-Epoxy electrode was reached by applying a chemical preconcentration step …
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The voltammetric ngerprint was obtained from both milk samples and showed an anodic peak between a potential range of 0.40–0.75 V versus Ag/AgCl. This anodic peak is mainly attributed to several electroactive species contained in both milk samples. The current intensities at the potential range of 0 to + 1 V versus Ag/
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Nitrogen compounds like urea and melamine are known to be commonly used for milk adulteration resulting in undesired intoxication; a well-known example is the Chinese episode occurred in 2008. The development of a rapid, reliable and economic test is of relevance in order to improve adulterated milk identification. Cyclic voltammetry studies …
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Based on sorption properties of clinoptilolite for urea [20], the further experiments were carried out to apply a preconcentration-voltammetric detection scheme to get the better electroanalytical performances for urea detection. 2.4.
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The voltammetric fingerprint was obtained from both milk samples and showed an anodic peak between a potential range of 0.40–0.75 V versus Ag/AgCl. ... V versus Ag/AgCl were further selected due to the majority of electroactive components in the milk samples having their oxidation potential in this potential range. ... soy milk, urea, or …
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Various factors influencing the analytical performance were optimized. The electrode, best operated at 0.2 V (vs. Ag/AgCl), has a linear response in the 10 nM to 0.2 μM NA concentration range. The detection limit is as low as 8.0 nM (at 3 Sb/m). The method was applied to the determination of NA in spiked plasma and urine samples.
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The GC/rGO0.1-NiO modified electrode is used for designing electrochemical sensor for urea, and the detection limit is estimated as 0.47 μM using the amperometry technique. ... Bebeselea A, Burtica G (2008) Voltammetric detection of urea on an Ag modified zeolite expanded graphite epoxy composite electrode. Sensors 8(9):5806–5819. …
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Voltammetric Detection of Urea on an Ag-Modified Zeolite-Expanded Graphite-Epoxy Composite Electrode Manea, Florica; Pop, Aniela; Radovan, Ciprian; Malchev, Plamen; …
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Differential pulse voltammograms recorded on EG-Ag-Z-Epoxy composite electrode with a potential scan rate 0.05 Vs-1 between 0 and 1V vs. SCE in a 0.1 M NaOH supporting …
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They were then stored under vacuum to prevent the oxidation of Ag. 2~3 strips were used for urea detection every day for 10 days in a row to see if the strips after 10 days storage can still function for urea detection via EC. ... Voltammetric Detection of Urea on an Ag-Modified Zeolite-Expanded Graphite-Epoxy Composite Electrode. …
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These results indicate that the electrode exhibits very wide determination range as well as excellent detection limit for urea determination. The relative standard deviation of 5 separate determinations was found to be 3.9%. ... Voltammetric detection of urea on an Ag-Modified zeolite-expanded graphite-epoxy composite electrode. Sensors, 8
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Voltammetric Detection of Urea on an Ag-Modified Zeolite-Expanded Graphite-Epoxy Composite Electrode Florica Manea 1,*, Aniela Pop 1, Ciprian Radovan 2, Plamen Malchev 3, Adriana Bebeselea 1, Georgeta Burtica 1, Stephen Picken 3 and Joop Schoonman 3 1 "Politehnica" University of Timi şoara, P-ta Victoriei, nr.2, 300006, Timişoara, Romania;
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The authors report on the electrochemical process for the modification of a screen printed carbon electrode (SPCE) with an azo-functionalized dimer of 4-amino phenylboronic acid. The dimer is prepared on the surface of the SPCE through the formation of azo bond, and the presence of the dimer is confirmed by cyclic voltammetry, X-ray …
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By considering all these limitations, Pt, Ag, Au/Pt, and Cu 2 S electrodes were designed with electrochemical detection by amperometry, voltammetric methods for non-enzymatic cholesterol biosensors. ... 4.2.3 Urea Detection. Renal diseases are also correlated with urea concentrations. The normal urea level ranges from 7 to 20 mg/dL …
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The linear dependence of the current versus urea concentration was reached using square-wave voltammetry in the concentrations range of urea between 0.2 to 1.4 mM, with a relatively low limit of ...
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The I-V consequences show high sensitivity for urea detection within 5–150 ... environmental and agricultural analyses [[5], [6], [7]]. ... via ultrasonication assisted suspension polymerization in silicon oil and its use for the fabrication of timolol voltammetric sensor. Mater. Sci. Eng. C (2017)
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lized for urea detection. Obtained biosensor showed linearity in the concentration range from 0.99 to 4.97 mM and could nd application in real urea analysis, as the serum urea concentra-tion is in the range of 1.3 to 3.5 mM. In this study, we present a comparison of electrochemical techniques for epinephrine determination with a biologically
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The linear dependence of the current versus urea concentration was reached using square-wave voltammetry in the concentrations range of urea between 0.2 to 1.4 mM, with a relatively low limit of detection of 0.05 mM. A moderate enhancement of electroanalytical sensitivity for the determination of urea at EG-Ag-Z-Epoxy electrode was
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Voltammetric Detection of Vanillylmandelic Acid and Homovanillic Acid Using Urea-Derivative-Modified Graphite Electrode. T. V. Shishkanova F. Králík A. Synytsya. Materials Science, Chemistry. ... Comparison and reappraisal of carbon electrodes for the voltammetric detection of dopamine. Anisha N. Patel Sze-yin Tan T. Miller J. …
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Differential pulse voltammograms recorded on EG-Ag-Z-Epoxy composite electrode with a potential scan rate 0.05 Vs −1 between 0 and 1V vs. SCE in a 0.1 M NaOH supporting electrolyte (1) and in the presence of different urea concentrations: 2-13: 0.2 …
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Accordingly, the newly developed sensing platform showed a wide dynamic linear range of 0.3–80 µM with detection limits (LODs) of 84, 88 and 130 nM for Pb2+, Cd2+ and Hg2+ ions, respectively.
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Nanostructures of NiCo2O4 exhibit a nanorod-like morphology and a cubic phase crystal structure. Urea can be detected with high sensitivity through NiCo2O4 nanostructures driven by urea precursors under alkaline conditions. A low limit of detection of 0.05 and an analytical range of 0.1 mM to 10 mM urea are provided.
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In this paper, a modified expanded graphite composite electrode based on natural zeolitic volcanic tuff modified with silver (EG-Ag-Z-Epoxy) was developed. Cyclic voltammetry …
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The change in redox current was quantified by differential pulse voltammetry, typically at a working voltage of 0.22 V vs. Ag/AgCl. The assay has a 1.9 pM detection limit, and the response is linear up to 150 nM concentration of urea.
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Under optimized conditions and a working potential of 1.07 V (vs. Ag/AgCl), the response to hCys is linear in the 0.2 to 10 μM concentration range. The detection limit is 10 nM, and the relative standard deviation is 3.1 % (at 1 μM of hCys). The electrode can be regenerated by immersing it into a 3 M solution of urea solution.
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A new electrochemical impedimetric sensor for direct detection of urea was designed and fabricated using nanostructured screen-printed electrodes (SPEs) modified with CuO/Co 3 O 4 @MWCNTs. A ...
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If one understands electroanalysis as all applications of electricity for chemical analysis, the position of voltammetric analysis is that of a subdivision: an overview on electroanalysis is given in Fig. 1.When electrodes (electron conductors, like metals, e.g. Hg, Au, Pt) or carbon (graphite, glassy carbon) are introduced in an electrolyte solution (or a …
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The detection of DA, AA, and UA has depended on voltammetric techniques in recent years. Despite such advantages as fast response and high sensitivity associated with these techniques, their use is typically problematic because of the overlap that is observed in the peak potentials of these three species when using conventional …
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Voltammetric Detection of Urea on an Ag-Modified Zeolite-Expanded Graphite-Epoxy Composite Electrode. Authors: Florica Manea. Polytechnic University of Timisoara. Aniela Pop. Polytechnic...
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electroanalytical sensitivity for the determination of urea at EG-Ag-Z-Epoxy electrode was reached by applying a chemical preconcentration step prior to …
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