scholarly journals Activated Bentonite Modified-Carbon Paste Electrode for Determination The Level of Copper Ion (Cu2+) in Tomato

2020 ◽  
Vol 9 (3) ◽  
pp. 177-186
Author(s):  
Irdhawati Irdhawati ◽  
Ekki Inur Ingtyas Mawarni ◽  
Ayu Jyostosya Yotirani Arya Wijana ◽  
Feby Silvia Sitio ◽  
Ni Putu Gita Widi Saraswati ◽  
...  
Keyword(s):  
Carbon Paste Electrode ◽  
Reference Electrode ◽  
Electrochemical Analysis ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Working Electrode ◽  
Improve Measurement ◽  
Activated Bentonite ◽  
Standard Solution ◽  
Paste Electrode

Voltammetry is an electroanalytical method measure current as a function of applied potential. The working electrode in the voltammetry method dramatically affects the result of the electrochemical analysis. Modification of the working electrode can improve measurement performance. In this research, the carbon paste electrode (CPE) was modified with Bentonite (CPEB) to determine copper's level using differential pulse voltammetry technique. CPE and CPEB were used as working electrodes, handmade Ag/AgCl as a reference electrode, and Pt wire as the counter electrode. The measurement parameters were optimized, including the composition of bentonite in carbon paste and scan rates. Furthermore, the measurement conditions were validated, involved linear concentration range, detection limit (LoD), the limit of quantization (LoQ), repeatability, and recovery. The results showed that bentonite's optimum composition was 40% of the total weight of graphite and activated bentonite.  The scan rate optimum for Cu2+ measurement was obtained at 20 mV/s with CPE and became faster to be 25 mV/s with CPEB. The linearity of the standard solution measurement of Cu2+ using CPE was in the range of 5 to 100 μg/L and changed to 5 to 500 μg/L using CPEB. LoD and LoQ values of standard solution Cu2+ measurement with CPEB were slower than CPE. The Horwitz ratio calculation was smaller than two for both CPE and CPEB. The recovery of Cu2+ standard measure in sample solution as the matrix was obtained 93,49 ± 6,39%. According to the Decree of the Ministry of Health Number, the level of Cu2+ in the tomato sample was found 6.019 ± 0.69 mg/kg, which is over than threshold value of Cu2+ (5 mg/kg) 03725/B/SK/VII/89. 

scholarly journals Electrochemical Determination of Famotidine in Real Samples Using rGO/Cu2O Nanocomposite Modified Carbon Paste Electrode

2022 ◽  
Author(s):  
Ali Afruz ◽  
Mandana Amiri ◽  
Hamideh Imanzadeh
Keyword(s):  
Carbon Paste Electrode ◽  
High Surface ◽  
High Surface Area ◽  
Electrochemical Analysis ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Real Samples ◽  
Inorganic Species ◽  
Cu2o Nanoparticles ◽  
Paste Electrode

Abstract Here, we developed a sensitive electrochemical sensor for famotidine (FAT) using Cu2O nanoparticles and reduced graphene oxide (rGO) as a sensing platform. The Cu2O nanoparticles and rGO were synthesized through a simple process and characterized by versatile analytical methods. The prepared Cu2O nanoparticles and rGO were taken to modify the carbon paste electrode (Cu2O/rGO/CPE) and developed for the electrochemical analysis of the FAT at pH 6.0. Cu2O/rGO/CPE showed superior electrocatalytic activity for detecting FAT, attributed to the high surface area of rGO and the electrocatalytic properties of Cu2O nanoparticles. The designed FAT sensor exhibited two linear ranges from 0.1-3 µM and 3-50 µM with a detection limit of 0.08 µM (S/N=3) using a differential pulse voltammetry. The proposed sensor also showed a repeatable and stable response over one month with negligible interference from usual organic and inorganic species. The sensor was also validated measuring FAT in real samples (urine, serum and pharmaceutical tablet) with good recovery values from 99.6 to 110.9%.

Mushroom tyrosinase-modified carbon paste electrode as an amperometric biosensor for phenols

1991 ◽  
Vol 56 (7) ◽  
pp. 1427-1433 ◽  
Author(s):  
Petr Skládal
Keyword(s):  
Carbon Paste Electrode ◽  
Response Times ◽  
Reference Electrode ◽  
Modified Carbon Paste Electrode ◽  
Mushroom Tyrosinase ◽  
Carbon Paste ◽  
Response Curves ◽  
Ph Response ◽  
Steady State Responses ◽  
Paste Electrode

A biosensor for a variety of substances could be readily prepared by the adsorption of partially purified mushroom tyrosinase at a carbon paste electrode, producing an enzyme layer which was protected with a dialysis membrane. The electrode poised at – 100mV (vs an Ag/AgCl reference electrode) functions on the basis of a reversible electrochemical reduction of the o-quinones formed from phenols in the tyrosinase reaction. The response times were 40 s for o-diphenols and 2 min for monophenols; the reproducibility for 10 consecutive assays of 3 μmol l-1 phenol solution was better than 4%. The detection limit was 10 nmol l-1 (catechol as substrate) and the steady state responses were linear up to a concentration of 200 μmol l-1. The optimum pH values were 6.0 for phenol and 6.5 for catechol. The shapes of the pH-response curves indicated the presence of at least two tyrosinase isoenzymes with different pH optima.

Electrochemical analysis of endosulfan using a C18-modified carbon-paste electrode

Chemosphere ◽  
2005 ◽  
Vol 60 (11) ◽  
pp. 1565-1571 ◽  
Author(s):  
Hicham El Bakouri ◽  
José Ma Palacios-Santander ◽  
Laura Cubillana-Aguilera ◽  
Abdelhamid Ouassini ◽  
Ignacio Naranjo-Rodríguez ◽  
...  
Keyword(s):  
Carbon Paste Electrode ◽  
Electrochemical Analysis ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Paste Electrode

scholarly journals Electrochemical analysis of indigo carmine using polyarginine modified carbon paste electrode

2021 ◽  
Author(s):  
D'Souza S. Edwin ◽  
Jamballi G. Manjunatha ◽  
Chenthattil Raril ◽  
Tigari Girish ◽  
Doddarasinakere K. Ravishankar ◽  
...  
Keyword(s):  
Carbon Paste Electrode ◽  
Limit Of Detection ◽  
Indigo Carmine ◽  
Electrochemical Analysis ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Limit Of Quantification ◽  
Selective Determination ◽  
Paste Electrode

Suitable electro-catalytic technique is established for the selective determination of Indigo Carmine (IC) at poly(arginine) modified carbon paste electrode (PAMCPE). The surface morphological study of the electrode is done through Field Emission Scanning Electron Microscopy (FESEM). The different parameters such as concentration, pH and scan rate on the electrode response are studied. The individual and simultaneous performance of IC and Riboflavin (RF) is carried out through differential pulse voltammetry. The electrocatalytic response of the sensor varied with the concentration of IC in the range from 2×10-7 M to 1×10-6 M and 1.5×10-6 M to 3.5×10-6 M is observed. Limit of detection (LOD) and the limit of quantification (LOQ) is found 2.53×10-8 M and 8.43×10-8 M respectively. The developed PAMCPE successfully shows better electrochemical response towards IC when compared with BCPE. Preparation and characterization of both the electrodes is simple and easier. This has derived a standard method for the determination of IC in real samples.      

scholarly journals Electro-Polymerized Titan Yellow Modified Carbon Paste Electrode for the Analysis of Curcumin

Surfaces ◽  
2021 ◽  
Vol 4 (3) ◽  
pp. 191-204
Author(s):  
Edwin S. D’Souza ◽  
Jamballi G. Manjunatha ◽  
Chenthattil Raril ◽  
Girish Tigari ◽  
Huligerepura J. Arpitha ◽  
...  
Keyword(s):  
Carbon Paste Electrode ◽  
Limit Of Detection ◽  
Phosphate Buffer Solution ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Buffer Solution ◽  
Solution Ph ◽  
Real Sample Analysis ◽  
Titan Yellow ◽  
Paste Electrode

A modest, efficient, and sensitive chemically modified electrode was fabricated for sensing curcumin (CRC) through an electrochemically polymerized titan yellow (TY) modified carbon paste electrode (PTYMCPE) in phosphate buffer solution (pH 7.0). Cyclic voltammetry (CV) linear sweep voltammetry (LSV) and differential pulse voltammetry (DPV) approaches were used for CRC detection. PTYMCPE interaction with CRC suggests that the electrode exhibits admirable electrochemical response as compared to bare carbon paste electrode (BCPE). Under the optimized circumstances, a linear response of the electrode was observed for CRC in the concentration range 2 × 10−6 M to 10 × 10−6 M with a limit of detection (LOD) of 10.94 × 10−7 M. Moreover, the effort explains that the PTYMCPE electrode has a hopeful approach for the electrochemical resolution of biologically significant compounds. Additionally, the proposed electrode has demonstrated many advantages such as easy preparation, elevated sensitivity, stability, and enhanced catalytic activity, and can be successfully applied in real sample analysis.

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