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      Rapid Detection of Ascorbic Acid Based on a Dual-Electrode Sensor System Using a Powder Microelectrode Embedded with Carboxyl Multi-Walled Carbon Nanotubes

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          Abstract

          In this paper, carboxyl groups were introduced by liquid oxidation methods onto multi-walled carbon nanotubes (MWCNTs) to improve the MWCNTs’ electrocatalytic properties. A platinum wire microelectrode (ME) was corroded using aqua regia and subsequently embedded with MWCNTs to achieve more active sites, producing a so-called powder microelectrode (PME). Compared with conventional MEs, the PME has a larger specific surface area and more active sites. When PME was used to detect ascorbic acid (AA), the AA oxidation potential shifted negatively and current peak was visibly increased. The calibration curve obtained for AA was in a range of 5.00 × 10 −6~9.50 × 10 −4 mol·L −1: I pa (μA) = 3.259 × 10 −2 + 1.801 × 10 2 C (mol·L −1) under the optimum testing conditions. Moreover, the detection and quantitation limits were confirmed at 4.89 × 10 −7 mol·L −1 and 1.63 × 10 −7 mol·L −1, respectively. When the fabricated PME was practically applied to detect AA, it was shown a recovery rate of 94~107% with relative standard deviation (RSD) <5%. The proposed strategy thus offers a promising, rapid, selective and low-cost approach to effective analysis of AA.

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          Most cited references 51

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          Theory of Stationary Electrode Polarography. Single Scan and Cyclic Methods Applied to Reversible, Irreversible, and Kinetic Systems.

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            Ascorbic acid: much more than just an antioxidant.

            Vitamin C (ascorbic acid (AA)) is very popular for its antioxidant properties. Consequently, many other important aspects of this multifaceted molecule are often underestimated or even ignored. In the present paper, we have tried to bring to the foreground some of these aspects, including the peculiarities of the AA biosynthetic pathway in different organisms, the remarkable function of AA as a co-substrate of many important dioxygenases, the role of AA-regenerating enzymes and the known pathways of AA catabolism, as well as the intriguing function of AA in gene expression.
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              Ascorbic acid: much more than just an antioxidant

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                Author and article information

                Journal
                Sensors (Basel)
                Sensors (Basel)
                sensors
                Sensors (Basel, Switzerland)
                MDPI
                1424-8220
                02 July 2017
                July 2017
                : 17
                : 7
                Affiliations
                School of Food Science and Technology, Henan University of Technology, Lianhua Road 100#, Zhengzhou 450001, China; zhangjunxia6163@ 123456126.com
                Author notes
                [* ]Correspondence: baoshanhe2008@ 123456haut.edu.cn ; Tel.: +86-0371-6775-8022
                sensors-17-01549
                10.3390/s17071549
                5539719
                28671599
                © 2017 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

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