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Selective Determination of Pyridoxal with an Octadecylamine- Modified Carbon-Paste Electrode

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Abstract

A carbon-paste electrode containing octadecylamine was used for voltammetric determination of pyridoxal in aqueous solutions. After chemical deposition of pyridoxal on the modified electrode through Schiff base formation, differential pulse voltammetry exhibited a well-developed reduction wave at +0.52 V vs. Ag/AgCl, due to the electrooxidation product of the Schiff base or pyridoxal which was regenerated by hydrolysis. No reduction wave was detected for compounds bearing a formyl group except for salicylaldehyde, which showed an analogous reduction wave at a potential of +0.80 V. This fact suggests that the electrode can be used for selective determination of pyridoxal. A linear calibration curve was obtained in a concentration range of 1 × 10-5 to 2×10-4 M.

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Authors and Affiliations

  1. Department of Environmental Chemistry and Engineering, Faculty of Engineering, Oita University, Dannoharu, Oita 870-11, Japan

    Naoyoshi Egashira, Shunya Aragaki, Hiroshi Iwanaga & Kazuya Ohga

Authors
  1. Naoyoshi Egashira
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  2. Shunya Aragaki
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  3. Hiroshi Iwanaga
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  4. Kazuya Ohga
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Egashira, N., Aragaki, S., Iwanaga, H. et al. Selective Determination of Pyridoxal with an Octadecylamine- Modified Carbon-Paste Electrode. ANAL. SCI. 7, 691–694 (1991). https://doi.org/10.2116/analsci.7.691

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  • DOI: https://doi.org/10.2116/analsci.7.691

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