scholarly journals Disposable Carbon Dots Modified Screen Printed Carbon Electrode Electrochemical Sensor Strip for Selective Detection of Ferric Ions

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Shao Chien Tan ◽  
Suk Fun Chin ◽  
Suh Cem Pang
Keyword(s):  
Electrochemical Sensor ◽  
Electrochemical Impedance ◽  
Limit Of Detection ◽  
Carbon Nanodots ◽  
Selective Detection ◽  
Carbon Electrode ◽  
Ferric Ions ◽  
Detection Range ◽  
Screen Printed Carbon Electrode ◽  
Screen Printed

A disposable electrochemical sensor strip based on carbon nanodots (C-Dots) modified screen printed carbon electrode (SPCE) was fabricated for selective detection of ferric ions (Fe3+) in aqueous solution. C-Dots of mean diameters within the range of 1–7 nm were synthesized electrochemically from spent battery carbon rods. The analytical performance of this electrochemical sensor strip was characterized using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The deposition of C-Dots had enhanced the electron-transfer kinetics and current intensity of the SPCE remarkably by 734% as compared to that of unmodified SPCE. Under optimized conditions, the electrochemical sensor strip exhibited a linear detection range of 0.5 to 25.0 ppm Fe3+ with a limit of detection (LOD) of 0.44±0.04 ppm (at S/N ratio = 3). Validation of results by the electrochemical sensor strip was done by comparing analysis results obtained using an Atomic Absorption Spectrometer (AAS).

scholarly journals Non-Enzymatic Impedimetric Sensor Based on 3-Aminophenylboronic Acid Functionalized Screen-Printed Carbon Electrode for Highly Sensitive Glucose Detection

Sensors ◽  
2019 ◽  
Vol 19 (7) ◽  
pp. 1686 ◽  
Author(s):  
Ricardo Adriano Dorledo de Faria ◽  
Hassan Iden ◽  
Luiz Guilherme Dias Heneine ◽  
Tulio Matencio ◽  
Younès Messaddeq
Keyword(s):  
Boronic Acid ◽  
Glucose Sensor ◽  
Electrochemical Impedance ◽  
Limit Of Detection ◽  
Phenylboronic Acid ◽  
Carbon Surface ◽  
Carbon Electrode ◽  
Screen Printed Carbon Electrode ◽  
Highly Sensitive ◽  
Screen Printed

A highly sensitive glucose sensor was prepared by a one-step method using 3-aminophenyl boronic acid as a unit of recognition and a screen-printed carbon electrode (SPCE) as an electrochemical transducer. Scanning Electron Microscopy confirmed the success of the functionalization of the SPCE due to the presence of clusters of boronic acid distributed on the carbon surface. In agreement with the Electrochemical Impedance Spectroscopy (EIS) tests performed before and after the functionalization, Cyclic Voltammetry results indicated that the electroactivity of the electrode decreased 37.9% owing to the presence of the poly phenylboronic acid on the electrode surface. EIS revealed that the sensor was capable to selectively detect glucose at a broad range of concentrations (limit of detection of 8.53 × 10−9 M), not recognizing fructose and sucrose. The device presented a stable impedimetric response when immediately prepared but suffered the influence of the storage time and some interfering species (dopamine, NaCl and animal serum). The response time at optimized conditions was estimated to be equal to 4.0 ± 0.6 s.

scholarly journals Electrochemical Determination of Lead & Copper Ions Using Thiolated Calix[4]arene-Modified Screen-Printed Carbon Electrode

Chemosensors ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 157
Author(s):  
Chong Jin Mei ◽  
Nor Azah Yusof ◽  
Shahrul Ainliah Alang Ahmad
Keyword(s):  
Electrochemical Impedance ◽  
Limit Of Detection ◽  
Copper Ions ◽  
Current Response ◽  
Carbon Electrode ◽  
Significant Drop ◽  
Screen Printed Carbon Electrode ◽  
Relative Standard ◽  
Competitive Ions ◽  
Screen Printed

This study used a thiolated calix[4]arene derivative modified on gold nanoparticles and a screen-printed carbon electrode (TC4/AuNPs/SPCE) for Pb2+ and Cu2+ determination. The surface of the modified electrode was characterised via Fourier-transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). Differential pulse voltammetry (DPV) was used for the detection of Pb2+ and Cu2+ under optimum conditions. The limit of detection (LOD) for detecting Pb2+ and Cu2+ was 0.7982 × 10−2 ppm and 1.3358 × 10−2 ppm, respectively. Except for Zn2+ and Hg2+, the presence of competitive ions caused little effect on the current response when detecting Pb2+. However, all competitive ions caused a significant drop in the current response when detecting Cu2+, except Ca2+ and Mg2+, suggesting the sensing platform is more selective toward Pb2+ ions rather than copper (Cu2+) ions. The electrochemical sensor demonstrated good reproducibility and excellent stability with a low relative standard deviation (RSD) value in detecting lead and copper ions. Most importantly, the result obtained in the analysis of Pb2+ and Cu2+ had good recovery in river water, demonstrating the applicability of the developed sensor for real samples.

scholarly journals Development of Highly Sensitive Immunosensor for Clenbuterol Detection by Using Poly(3,4-ethylenedioxythiophene)/Graphene Oxide Modified Screen-Printed Carbon Electrode

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4324 ◽  
Author(s):  
Nurul Talib ◽  
Faridah Salam ◽  
Yusran Sulaiman
Keyword(s):  
Graphene Oxide ◽  
Limit Of Detection ◽  
Food Product ◽  
Electrochemical Immunosensor ◽  
Growth Promoter ◽  
Carbon Electrode ◽  
Electrochemical Assay ◽  
Sensor Platform ◽  
Screen Printed Carbon Electrode ◽  
Screen Printed

Clenbuterol (CLB) is an antibiotic and illegal growth promoter drug that has a long half-life and easily remains as residue and contaminates the animal-based food product that leads to various health problems. In this work, electrochemical immunosensor based on poly(3,4-ethylenedioxythiophene)/graphene oxide (PEDOT/GO) modified screen-printed carbon electrode (SPCE) for CLB detection was developed for antibiotic monitoring in a food product. The modification of SPCE with PEDOT/GO as a sensor platform was performed through electropolymerization, while the electrochemical assay was accomplished while using direct competitive format in which the free CLB and clenbuterol-horseradish peroxidase (CLB-HRP) in the solution will compete to form binding with the polyclonal anti-clenbuterol antibody (Ab) immobilized onto the modified electrode surface. A linear standard CLB calibration curve with R2 = 0.9619 and low limit of detection (0.196 ng mL−1) was reported. Analysis of milk samples indicated that this immunosensor was able to detect CLB in real samples and the results that were obtained were comparable with enzyme-linked immunosorbent assays (ELISA).

scholarly journals Laccase Electrochemical Biosensor Based on Graphene-Gold/Chitosan Nanocomposite Film for Bisphenol A Detection

2020 ◽  
Vol 16 (5) ◽  
pp. 570-579
Author(s):  
Fuzi M. Fartas ◽  
Jaafar Abdullah ◽  
Nor A. Yusof ◽  
Yusran Sulaiman ◽  
Mohd I. Saiman ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Electrochemical Biosensor ◽  
Limit Of Detection ◽  
Modified Electrodes ◽  
Electrochemical Performances ◽  
Carbon Electrode ◽  
Screen Printed Carbon Electrode ◽  
Laccase Enzyme ◽  
Bisphenol A Detection ◽  
Screen Printed

Background: Bisphenol A (BPA) is considered one of the most common chemicals that could cause environmental endocrine disrupting. Therefore, there is an increasing demand for simple, rapid and sensitive methods for BPA detection that result from BPA leaching into foods and beverages from storage containers. Herein, a simple laccase electrochemical biosensor was developed for the determination of BPA based on Screen-Printed Carbon Electrode (SPCE) modified graphenegold/ chitosan. The synergic effect of graphene-gold/chitosan nanocomposite as electrode modifier greatly facilitates electron-transfer processes between the electrolyte and laccase enzyme, thus leads to a remarkably improved sensitivity for bisphenol A detection. Methods: In this study, laccase enzyme is immobilized onto the Screen-Printed Carbon Electrode (SPCE) modified Graphene-Decorated Gold Nanoparticles (Gr-AuNPs) with Chitosan (Chit). The surface structure of nanocomposite was studied using different techniques including Field Emission Scanning Microscopy (FESEM), TRANSMISSION Electron Microscopy (TEM), Raman spectroscopy and Energy Dispersive X-ray (EDX). Meanwhile, the electrochemical performances of the modified electrodes were studied using Cyclic Voltammetry (CV) and Differential Pulse Voltammetry (DPV). Results: The developed laccase biosensor offered excellent analytical performance for the detection of BPA with a sensitivity of 0.271 μA/μM and Limit of Detection (LOD) of 0.023 μM, respectively. Moreover, the constructed biosensor showed good reproducibility, selectivity and stability towards BPA. The sensor has been used to detect BPA in a different type of commercial plastic products as a real sample and satisfactory result was obtained when compared with the HPLC method. Conclusion: The proposed electrochemical laccase biosensor exhibits good result which is considered as a promising candidate for a simple, rapid and sensitive method especially in the resource- limited condition.

Electrochemical Immunosensor Based on Highly Sensitive Amino Functionalized Graphene Nanoplatelets-Modified Screen Printed Carbon Electrode

2020 ◽  
Vol 833 ◽  
pp. 171-175
Author(s):  
Nurul Azurin Badruzaman ◽  
Mohd Azraie Mohd Azmi ◽  
Nur Azura Mohd Said
Keyword(s):  
Incubation Time ◽  
Electrochemical Impedance ◽  
Electrochemical Immunosensor ◽  
Graphene Nanoplatelets ◽  
Carbon Electrode ◽  
Functionalized Graphene ◽  
Working Electrode ◽  
Screen Printed Carbon Electrode ◽  
Rabbit Igg ◽  
Screen Printed

We presented here the development of an immunosensor based on graphene nanoplatelets-modified screen printed carbon electrode (SPCE) with incorporated rabbit IgG on the amino functionalized surface area. In order to improve sensitivity of working electrode, graphene-nanoplatelets solution was fabricated onto surface carbon working electrode. The effect of different (3-aminopropyl) triethoxysilane (APTES) concentrations (0.125, 0.5, 2 and 8% (v/v)) and incubation time of silanization (30, 60 and 90 min) were studied and compared. An electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) were used to characterize our immunosensor based. It is showed that the optimum APTES concentration which provides higher surface coverage and electron transfer rate was 2% concentration (v/v) at 60 min of incubation time. The modified surface was then evaluated by measuring immobilized rabbit IgG via indirect assay using horseradish peroxidase labelled secondary antibody. The optimum detection immobilized IgG was 0.05 mg/mL. These results indicate the potential for amino functionalized graphene nanoplatelets-modified SPCE in detecting protein biomarkers.

scholarly journals First Electrochemical Sensor (Screen-Printed Carbon Electrode Modified with Carboxyl Functionalized Multiwalled Carbon Nanotubes) for Ultratrace Determination of Diclofenac

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 781 ◽  
Author(s):  
Agnieszka Sasal ◽  
Katarzyna Tyszczuk-Rotko ◽  
Magdalena Wójciak ◽  
Ireneusz Sowa
Keyword(s):  
Carbon Nanotubes ◽  
Electrochemical Sensor ◽  
Multiwalled Carbon Nanotubes ◽  
Active Surface Area ◽  
Carbon Electrode ◽  
Multiwalled Carbon ◽  
Screen Printed Carbon Electrode ◽  
Functionalized Multiwalled Carbon Nanotubes ◽  
Screen Printed

A simple, sensitive and time-saving differential-pulse adsorptive stripping voltammetric (DPAdSV) procedure using a screen-printed carbon electrode modified with carboxyl functionalized multiwalled carbon nanotubes (SPCE/MWCNTs-COOH) for the determination of diclofenac (DF) is presented. The sensor was characterized using optical profilometry, SEM, and cyclic voltammetry (CV). The use of carboxyl functionalized MWCNTs as a SPCE modifier improved the electron transfer process and the active surface area of sensor. Under optimum conditions, very sensitive results were obtained with a linear range of 0.1–10.0 nmol L−1 and a limit of detection value of 0.028 nmol L−1. The SPCE/MWCNTs-COOH also exhibited satisfactory repeatability, reproducibility, and selectivity towards potential interferences. Moreover, for the first time, the electrochemical sensor allows determining the real concentrations of DF in environmental water samples without sample pretreatment steps.

scholarly journals DNA Electrochemical Biosensor Based on Iron Oxide/Nanocellulose Crystalline Composite Modified Screen-Printed Carbon Electrode for Detection of Mycobacterium tuberculosis

Molecules ◽  
2020 ◽  
Vol 25 (15) ◽  
pp. 3373
Author(s):  
Mohd Hazani Mat Zaid ◽  
Che Engku Noramalina Che-Engku-Chik ◽  
Nor Azah Yusof ◽  
Jaafar Abdullah ◽  
Siti Sarah Othman ◽  
...  
Keyword(s):  
Mycobacterium Tuberculosis ◽  
Iron Oxide ◽  
Differential Pulse ◽  
Ammonium Bromide ◽  
Coupling Mechanism ◽  
Carbon Electrode ◽  
Specific Sequence ◽  
Detection Range ◽  
Screen Printed Carbon Electrode ◽  
Screen Printed

Death from tuberculosis has resulted in an increased need for early detection to prevent a tuberculosis (TB) epidemic, especially in closed and crowded populations. Herein, a sensitive electrochemical DNA biosensor based on functionalized iron oxide with mercaptopropionic acid (MPA-Fe3O4) nanoparticle and nanocellulose crystalline functionalized cetyl trimethyl ammonium bromide (NCC/CTAB) has been fabricated for the detection of Mycobacterium tuberculosis (MTB). In this study, a simple drop cast method was applied to deposit solution of MPA-Fe3O4/NCC/CTAB onto the surface of the screen-printed carbon electrode (SPCE). Then, a specific sequence of MTB DNA probe was immobilized onto a modified SPCE surface by using the 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide/N-hydroxysuccinimide (EDC/NHS) coupling mechanism. For better signal amplification and electrochemical response, ruthenium bipyridyl Ru(bpy)32+ was assigned as labels of hybridization followed by the characteristic test using differential pulse voltammetry (DPV). The results of this biosensor enable the detection of target DNA until a concentration as low as 7.96 × 10−13 M with a wide detection range from 1.0 × 10−6 to 1.0 × 10−12 M. In addition, the developed biosensor has shown a differentiation between positive and negative MTB samples in real sampel analysis.

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