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Polyaniline‐Based Sensor Material for Potentiometric Determination of Ascorbic Acid |
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| Authors: | K. A. Milakin A. N. Korovin E. V. Moroz K. Levon A. Guiseppi‐Elie V. G. Sergeyev |
| Affiliation: | 1. Polymer Science Division, Chemistry Department, Moscow State University, Leninskie Gory 1, Bldg. 40, Moscow, 119991, Russia;2. Department of Chemical and Biological Sciences, Polytechnic Institute of New York University, Six MetroTech Center, Brooklyn, NY 11201, USA. ?bo Akademi Process Chemistry Centre, ?bo Akademi University, ?bo‐Turku, Finland;3. Center for Bioelectronics, Biosensors and Biochips (C3B), Clemson University Advanced Materials Center, 100 Technology Drive, Anderson, South Carolina 29625, USA |
| Abstract: | Polyaniline (PANI)‐based sensor material for determination of ascorbic acid was synthesized by oxidative chemical polymerization of aniline on a screen‐printed carbon‐paste electrode. The influence of PANI chemical structure formed under various polymerization conditions on the sensor response was investigated. The presence of aniline dimer derivatives in PANI structure was found to induce significant improvement of the limit of detection and the linear dynamic range without a change in sensitivity. The sensor prepared by aniline polymerization in pH 7 buffer leading to the product containing mainly the aniline dimer‐based units showed the best detection limit of 0.1 µM. It was shown that the PANI‐based sensor could be used for ascorbic acid analysis in the presence of citrate and lactate as interfering ions. A quantitative determination of ascorbic acid concentration in beverages and vitamins was performed. |
| Keywords: | Ascorbic acid Polyaniline Polymerization Potentiometry Sensors |