Homopolymerization of 3-aminobenzoic acid for enzyme-free electrocatalytic assay of nitrite ions

• Published in: New journal of chemistry Vol. 44; no. 5; pp. 222 - 232
• Main Authors: Asiri, Abdullah M, Adeosun, Waheed A, Marwani, Hadi M, Rahman, Mohammed M
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 03.02.2020
• Subjects: Carcinogens; Fourier transforms; Glassy carbon; Oxidation; Photoelectrons; Voltammetry; X ray powder diffraction
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/c9nj06058h

We present a method for non-enzymatic detection of the nitrite ion (an inherent carcinogen) using poly-3-aminobenzoic acid (P-3ABA) synthesized by an electrochemical method. Its synthesis was confirmed using scanning electron microscopy and spectroscopy (X-ray powder diffraction, energy-dispersive X-ray, X-ray photoelectron, Fourier-transform infrared). P-3ABA electrocatalyzed oxidation of nitrite to nitrate using cyclic voltammetry and differential pulse voltammetry. The synthesized P-3ABA had a low limit of detection (LoD) (0.15 μM, S/N = 3), high sensitivity (1.5 μA μM −1 cm −2 ), stable and highly reproducible responses with a relatively wide linear range (10-140 μM). A P-3ABA-modified glassy carbon electrode displayed good applicability in determination of nitrite in real samples in various matrices. Therefore, we present P-3ABA as a novel, cost-effective and promising nitrite sensor for protection of human health. We describe non-enzymatic novel detection of nitrite ions in various matrices on the surface of poly-3-aminobenzoic acid.