Electroactive polyamide modified carbon paste electrode for the determination of ascorbic acid

ABSTRACTS

Construction electroactive polyamide (EPA) with aniline-pentamer-based in the main chain has been modified on the surface of carbon paste electrode (CPE) for detecting ascorbic acid (AA). Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy studies confirm the well-defined molecular structure of the oligoaniline and EPA. Further, the in situ chemical oxidation of EPA was monitored by UV-Visible absorption spectrum. The electroactivity of the EPA was evaluated by performing electrochemical cyclic voltammetry study. The sensing response studies have revealed that this EPA-modified CPE electrode can detect AA in the range of 0.05–0.7 mM with detection limit of 0.005 mM and sensitivity of 1.5 × 10^–5 AmM^–1. Besides, this EPA-modified CPE electrode shows a minimal relative standard deviation of 1.73%.

KEYWORDS:

• Ascorbic acid
• carbon paste electrode
• electroactive polyamide
• electrochemical sensor
• oligoaniline

Acknowledgments

The authors thank Mr Chun-An Chen for the schematic design.

Funding

This research was supported by the Ministry of Science and Technology, Republic of China under grant number MOST 103-2221-E-167-037-MY3 and MOST 104-2811-E-167-001.

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Additional information

Funding

This research was supported by the Ministry of Science and Technology, Republic of China under grant number MOST 103-2221-E-167-037-MY3 and MOST 104-2811-E-167-001.