Abstract—A simple flow injection analysis (FIA) equipped with an electrochemical graphene (GP)-polyaniline (PANI) nanocomposite sensor as a detector has been investigated for determination of ascorbic acid (AA) in fruit samples. Northern Thai fruits (longans and lychees) harvested in Chiang Mai and Lamphun districts were selected for this study. The GP-PANI nanocomposite was interfacially polymerised and characterised by cyclic voltammetry. Observable electro-oxidation response of AA over the nanocomposite electrode with high peak current at a low potential was found. Optimisations of the experimental conditions were carried out which were found to be 0.1 M phosphate buffer, pH 7, 1.5 mL.min-1 flow rate, 100 μL sample injection volume, respectively. The good linear range of calibration curve, low limit of detection, and high sensitivity for the proposed method were found to be 0.05–0.50 mM, 0.027 mM, and 4.5754 mA.mM
-1, respectively.
Index Terms—Graphene, polyaniline, amperometry, flow injection, ascorbic acid.
The authors are with the Center of Excellence for Innovation in Chemistry (PERCH-CIC), Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand (e-mail: view-wow@hotmail.com, orn.arquero@gmail.com, scislwrn@gmail.com, suriyacmu@yahoo.com).
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Cite: Poachanee Norfun, Ornanong Arqueropanyo, Saisunee Liawruangrath, and Kontad Ounnunkad, "Electrochemical Flow Injection Determination of Ascorbic Acid in Fruit Samples Employing a Graphene-Polyaniline Electrode," International Journal of Chemical Engineering and Applications vol. 7, no. 2, pp. 142-145, 2016.
