Direct Determination of Ascorbic Acid in Fruits and Vegetables by Positive Scan Polarization Reverse Catalytic Voltammetry

Publication date: August 2019Source: Chinese Journal of Analytical Chemistry, Volume 47, Issue 8Author(s): Pan PAN, Shou-Guo WUAbstractThe positive scan polarization reverse catalytic voltammetry was used for direct detection of ascorbic acid in fruit and vegetable samples. An ascorbic acid sensor was fabricated based on CuxO nanoparticles protected by the graphene oxide (GO) layer. The common copper electrode was first electrooxidized in strong alkaline solution to generate CuxO nanoparticles on the electrode surface, then GO was electrodeposited to form a protective layer covered on the surface of CuxO nanoparticles. The resulting sensor exhibited excellent electrocatalytic activity toward oxidation of ascorbic acid. There was a wide linear range between the difference value peak current of the sensor and the ascorbic acid concentration from 1.25 × 10−7 M to 1.60 × 10−5 M, with a detection limit of 5.90 × 10−8 M (S/N = 3). The results demonstrated that the proposed method possessed excellent detection capability, including fast response, high reproducibility and stability.Graphical abstractAn excellent ascorbic acid (AA) sensor was prepared based on the CuxO nanoparticles protected by graphene oxide layer. The positive scan polarization reverse catalytic voltammetry (PSPRCV) was employed for direct detection of AA in fresh fruits and vegetables.
Source: Chinese Journal of Analytical Chemistry - Category: Chemistry Source Type: research