scholarly journals MnO2@Reduced Graphene Oxide Nanocomposite-Based Electrochemical Sensor for the Simultaneous Determination of Trace Cd(II), Zn(II) and Cu(II) in Water Samples

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 517
Author(s):  
Siyamthanda Hope Mnyipika ◽  
Tshimangadzo Saddam Munonde ◽  
Philiswa Nosizo Nomngongo
Keyword(s):  
Heavy Metals ◽  
Electrochemical Sensor ◽  
Simultaneous Determination ◽  
Rapid Detection ◽  
Electrochemical Sensors ◽  
Simultaneous Detection ◽  
Cyclic Voltammograms ◽  
Current Response ◽  
Mno2 Nanoparticles

The rapid detection of trace metals is one of the most important aspect in achieving environmental monitoring and protection. Electrochemical sensors remain a key solution for rapid detection of heavy metals in environmental water matrices. This paper reports the fabrication of an electrochemical sensor obtained by the simultaneous electrodeposition of MnO2 nanoparticles and RGO nanosheets on the surface of a glassy carbon electrode. The successful electrodeposition was confirmed by the enhanced current response on the cyclic voltammograms. The XRD, HR-SEM/EDX, TEM, FTIR, and BET characterization confirmed the successful synthesis of MnO2 nanoparticles, RGO nanosheets, and MnO2@RGO nanocomposite. The electrochemical studies results revealed that MnO2@RGO@GCE nanocomposite considerably improved the current response on the detection of Zn(II), Cd(II) and Cu(II) ions in surface water. These remarkable improvements were due to the interaction between MnO2 nanomaterials and RGO nanosheets. Moreover, the modified sensor electrode portrayed high sensitivity, reproducibility, and stability on the simultaneous determination of Zn(II), Cd(II), and Cu(II) ions. The detection limits of (S/N = 3) ranged from 0.002–0.015 μg L−1 for the simultaneous detection of Zn(II), Cd(II), and Cu(II) ions. The results show that MnO2@RGO nanocomposite can be successfully used for the early detection of heavy metals with higher sensitivity in water sample analysis.

A Novel Electrochemical Sensor for the Simultaneous Determination of Fat-Soluble Vitamins Using a Screen-Printed Graphene/Nafion Electrode

2018 ◽  
Vol 777 ◽  
pp. 597-601 ◽  
Author(s):  
Jeerakit Thangphatthanarungruang ◽  
Aroonsri Ngamaroonchote ◽  
Rawiwan Laocharoensuk ◽  
Chuleekorn Chotsuwan ◽  
Weena Siangproh
Keyword(s):  
Electrochemical Sensor ◽  
Simultaneous Determination ◽  
Sodium Perchlorate ◽  
Simultaneous Detection ◽  
High Sensitivity ◽  
Morphological Characterization ◽  
Quiet Time ◽  
Fat Soluble Vitamins ◽  
Screen Printed

In this work, a novel electrochemical sensor was proposed for the simultaneous determination of fat-soluble vitamins (A, D, E, K) using a screen-printed graphene/Nafion electrode (SPGNE). The scanning electron microscopy was used for morphological characterization of the electrode surface. The electrochemical behaviors of fat-soluble vitamins have been studied in a mixture of ethanol and sodium perchlorate monohydrate using square-wave voltammetry (SWV). The results obtained indicated that the oxidation peak of each fat-soluble vitamin appeared at different potentials leading to the possibility for the simultaneous detection. The influences of experimental parameters such as the effects of proportions of ethanol, potential increment, amplitude, frequency and quiet time were examined. Under the optimized conditions, the linearity between oxidative currents and concentrations of fat-soluble vitamins ranged from 0.1 μg mL-1 to 5 μg mL-1 for vitamin A, 0.08 μg mL-1 to 5 μg mL-1 for vitamin D and E, and 0.2 μg mL-1 to 1.6 μg mL-1 for total vitamin K, with the limits of detection of 0.018, 0.013, 0.012 and 0.004 μg mL-1, respectively. These developed sensors provide high sensitivity in detection and offer high potential to apply them for the simultaneous determination of fat-soluble vitamins in dietary supplements.

Simultaneous detection of roxithromycin and dopamine using a sensor platform based on poly(sulfosalicylic acid) and its application in human serum studies

2014 ◽  
Vol 6 (10) ◽  
pp. 3316-3321 ◽  
Author(s):  
Xin Zhang ◽  
Shuqing Gu ◽  
Yaping Ding
Keyword(s):  
Detection Limit ◽  
Human Serum ◽  
Electrochemical Sensor ◽  
Simultaneous Determination ◽  
Simultaneous Detection ◽  
Sensitive Detection ◽  
Serum Samples ◽  
Sulfosalicylic Acid ◽  
Sensor Platform

An electrochemical sensor based on poly(sulfosalicylic acid) was fabricated for individual and simultaneous determination of roxithromycin and dopamine with a sensitive detection limit and a satisfactory detection result using human serum samples.

scholarly journals Simultaneous determination of methadone and morphine at a modified electrode with 3D β-MnO2 nanoflowers: application for pharmaceutical sample analysis

RSC Advances ◽  
2020 ◽  
Vol 10 (63) ◽  
pp. 38532-38545
Author(s):  
Sedigheh Akbari ◽  
Shohreh Jahani ◽  
Mohammad Mehdi Foroughi ◽  
Hadi Hassani Nadiki
Keyword(s):  
Electrochemical Sensor ◽  
Simultaneous Determination ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Simultaneous Detection ◽  
Carbon Electrode ◽  
Sample Analysis ◽  
Modified Glassy Carbon Electrode ◽  
Pharmaceutical Sample

Electrochemical sensor based on β-MnO2 nanoflower-modified glassy carbon electrode for the simultaneous detection of methadone and morphine was fabricated.

Electrochemical behaviors and simultaneous determination of guanine and adenine based on highly ordered Pd-nanowire arrays-modified glassy carbon electrode

2015 ◽  
Vol 7 (12) ◽  
pp. 4988-4994 ◽  
Author(s):  
Min Zhang ◽  
Feng Gan ◽  
Faliang Cheng
Keyword(s):  
Electrochemical Sensor ◽  
Simultaneous Determination ◽  
Glassy Carbon ◽  
Simultaneous Detection ◽  
Nanowire Arrays ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Electrochemical Behaviors ◽  
Guanine And Adenine

A novel electrochemical sensor based on a Pd nanowire arrays (Pd NWAs) electrode for the simultaneous detection of guanine (G) and adenine (A).

Simultaneous determination of hydroquinone and catechol using an electrode modified by a composite of graphene/lanthanum hydroxide nanowires

2014 ◽  
Vol 6 (20) ◽  
pp. 8314-8320 ◽  
Author(s):  
Zhuo Guo ◽  
Yin Lu ◽  
Jian Li ◽  
Xian-feng Xu ◽  
Guo-qing Huang ◽  
...  
Keyword(s):  
Electrochemical Sensor ◽  
Simultaneous Determination ◽  
Simultaneous Detection ◽  
Lanthanum Hydroxide

An electrochemical sensor modified by La(OH)3 nanorods and graphene hybrids for the simultaneous detection of hydroquinone and catechol.

Graphene Modified Molecular Imprinting Electrochemical Sensor for Determining the Content of Dopamine

2019 ◽  
Vol 15 (6) ◽  
pp. 628-634
Author(s):  
Rong Liu ◽  
Jie Li ◽  
Tongsheng Zhong ◽  
Liping Long
Keyword(s):  
Electrochemical Sensor ◽  
Molecular Imprinting ◽  
Neurological Disorders ◽  
Room Temperature ◽  
Low Cost ◽  
Differential Pulse ◽  
Current Response ◽  
Specific Selectivity ◽  
Pulse Voltammetry

Background: The unnatural levels of dopamine (DA) result in serious neurological disorders such as Parkinson’s disease. Electrochemical methods which have the obvious advantages of simple operation and low-cost instrumentation were widely used for determination of DA. In order to improve the measurement performance of the electrochemical sensor, molecular imprinting technique and graphene have always been employed to increase the selectivity and sensitivity. Methods: An electrochemical sensor which has specific selectivity to (DA) was proposed based on the combination of a molecular imprinting polymer (MIP) with a graphene (GR) modified gold electrode. The performance and effect of MIP film were investigated by differential pulse voltammetry (DPV) and cyclic voltammetry (CV) in the solution of 5.0 ×10-3 mol/L K3[Fe(CN)6] and K4[Fe(CN)6] with 0.2 mol/L KCl at room temperature. Results: This fabricated sensor has well repeatability and stability, and was used to determine the dopamine of urine. Under the optimized experiment conditions, the current response of the imprinted sensor was linear to the concentration of dopamine in the range of 1.0×10-7 ~ 1.0×10-5 mol/L, the linear equation was I (µA) = 7.9824+2.7210lgc (mol/L) with the detection limit of 3.3×10-8 mol/L. Conclusion: In this work, a highly efficient sensor for determination of DA was prepared with good sensitivity by GR and great selectivity of high special recognization ability by molecular imprinting membrane. This proposed sensor was used to determine the dopamine in human urine successfully.

scholarly journals Development of a multicolor upconversion fluorescence immunoassay for the simultaneous detection of thiamethoxam and dextran by magnetic separation

RSC Advances ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 517-524
Author(s):  
Chuanyong Li ◽  
Wanlin Sun ◽  
Lianrun Huang ◽  
Nana Sun ◽  
Xiude Hua ◽  
...  
Keyword(s):  
Monoclonal Antibodies ◽  
Simultaneous Determination ◽  
Magnetic Separation ◽  
Simultaneous Detection ◽  
Fluorescence Immunoassay ◽  
Upconversion Fluorescence

The anti-thiamethoxam and anti-dextran monoclonal antibodies were prepared to develop a multicolor upconversion fluorescence immunoassay for the simultaneous determination of thiamethoxam (544 nm) and dextran (477 nm).

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