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

Abstract:

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.

• Periodical: Key Engineering Materials (Volume 777)
• Pages: 597-601
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.777.597
• Online since: August 2018
• Authors: Jeerakit Thangphatthanarungruang, Aroonsri Ngamaroonchote, Rawiwan Laocharoensuk, Chuleekorn Chotsuwan, Weena Siangproh*
• Keywords: Fat-Soluble Vitamins, Graphene, Nafion, Screen-Printed Electrode

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