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

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.

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 517
Author(s):  
Siyamthanda Hope Mnyipika ◽  
Tshimangadzo Saddam Munonde ◽  
Philiswa Nosizo Nomngongo

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.


Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1691 ◽  
Author(s):  
Yue Wang ◽  
Tian Yang ◽  
Yasushi Hasebe ◽  
Zhiqiang Zhang ◽  
Dongping Tao

Carbon black (CB) and carbon nanotube (CNT) co-doped polyimide (PI) modified glassy carbon electrode (CB-CNT/PI/GCE) was first prepared for the simultaneous determination of ascorbic acid (AA), dopamine (DA), and uric acid (UA). The CB-CNT/PI/GCE exhibited persistent electrochemical behavior and excellent catalytic activities. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used for the simultaneous detection of AA, DA, and UA in their ternary mixture. The peak separations between AA and DA, and DA and UA, are up to 166 mV and 148 mV, respectively. The CB-CNT/PI/GCE exhibited high sensitivity to DA and UA, with the detection limit of 1.9 µM and 3 µM, respectively. In addition, the CB-CNT/PI/GCE showed sufficient selectivity and long-term stability, and was applicable to detect AA, DA, and UA in human urine sample.


2014 ◽  
Vol 6 (10) ◽  
pp. 3316-3321 ◽  
Author(s):  
Xin Zhang ◽  
Shuqing Gu ◽  
Yaping Ding

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.


RSC Advances ◽  
2020 ◽  
Vol 10 (63) ◽  
pp. 38532-38545
Author(s):  
Sedigheh Akbari ◽  
Shohreh Jahani ◽  
Mohammad Mehdi Foroughi ◽  
Hadi Hassani Nadiki

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


2015 ◽  
Vol 7 (12) ◽  
pp. 4988-4994 ◽  
Author(s):  
Min Zhang ◽  
Feng Gan ◽  
Faliang Cheng

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


2014 ◽  
Vol 6 (20) ◽  
pp. 8314-8320 ◽  
Author(s):  
Zhuo Guo ◽  
Yin Lu ◽  
Jian Li ◽  
Xian-feng Xu ◽  
Guo-qing Huang ◽  
...  

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


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