A disposable electrochemical sensor for simultaneous determination of norepinephrine and serotonin in rat cerebrospinal fluid based on MWNTs-ZnO/chitosan composites modified screen-printed electrode

2015 ◽  
Vol 65 ◽  
pp. 31-38 ◽  
Author(s):  
Yuting Wang ◽  
Shi Wang ◽  
Li Tao ◽  
Qing Min ◽  
Jin Xiang ◽  
...  
Keyword(s):  
Cerebrospinal Fluid ◽  
Electrochemical Sensor ◽  
Simultaneous Determination ◽  
Screen Printed Electrode ◽  
Screen Printed

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 determination of trace Cd2+ and Pb2+ using GR/l-cysteine/Bi modified screen-printed electrodes

2018 ◽  
Vol 10 (40) ◽  
pp. 4945-4950 ◽  
Author(s):  
Chao Li ◽  
Xiaole Zhao ◽  
Xiaojun Han
Keyword(s):  
Graphene Oxide ◽  
Simultaneous Determination ◽  
Reduced Graphene Oxide ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Screen Printed Electrode ◽  
Reduced Graphene ◽  
Anodic Stripping ◽  
Screen Printed

A GR/l-cys/Bi/SPE (reduced graphene oxide/l-cysteine/Bi/screen-printed electrode) was prepared to simultaneously determine Cd2+ and Pb2+ ions by using SWASV (square wave anodic stripping voltammetry).

scholarly journals Electrochemical sensor for determination of hydroxylamine using functionalized Fe3O4 nanoparticles and graphene oxide modified screen-printed electrode

2021 ◽  
Author(s):  
Hamed Tashakkorian ◽  
Behnaz Aflatoonian ◽  
Peyman Mohammadzadeh Jahani ◽  
Mohammad Reza Aflatoonian
Keyword(s):  
Graphene Oxide ◽  
Electrochemical Sensor ◽  
Fe3o4 Nanoparticles ◽  
Phosphate Buffer Solution ◽  
Electrochemical Process ◽  
Screen Printed Electrode ◽  
Buffer Solution ◽  
Solution Ph ◽  
Screen Printed

A simple strategy for determination of hydroxylamine based on Fe3O4 nanoparticles function­nalized by [2-(4-((3-(trimethoxysilyl)propylthio)methyl)1-H1,2,3-triazol-1-yl)acetic­acid] (FNPs) and graphene oxide (GO) modified screen-printed electrode (SPE), denoted as (Fe3O4 FNPs/GO/SPE), is reported. The electrochemical behavior of hydroxylamine was investigated at Fe3O4FNPs/GO/SPE by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and chro­noamperometry (CHA) techniques in phosphate buffer solution (pH 7.0). Fe3O4 FNPs/GO/SPE as a novel electrochemical sensor exhibited catalytic activity toward the oxidation of hydroxyl­ami­ne. The potential of hydroxylamine oxidation was shifted to more negative potentials, and its oxidation peak current increased on the modified electrode, also indicating that under these conditions, the electrochemical process is irreversible. The electrocatalytic current of hydroxyl­amine showed a good relationship in the concentration range of 0.05–700.0 μM, with a detection limit of 10.0 nM. The proposed electrode was applied for the determination of hydroxyl­amine in water samples, too.

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