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Electrochemical Detection of Ascorbic Acid in Citrus Juices using Mn-doped ZnO nanorods modified graphene oxide

Modified graphene oxide (GO) electrochemical sensor was successfully used to determine ascorbic acid (AA). Manganese (Mn)-doped ZnO nanorods (ZnO NRs) was synthesized through the electrochemical technique and applied for modification of GO/glassy carbon electrode (GCE). Field emission scanning electron microscopy and X-ray diffraction analysis were applied to characterize the morphological and structural properties of synthesized Mn-doped ZnO NRs. Cyclic voltammetry and differential pulse voltammetry analysis were used to electrochemically sensing the properties of Mn-doped ZnO NRs/GO/GCE. The electrochemical studies exhibited the modified electrode had fast response, selective and stable in determining AA. The sensitivity and detection limit of sensor were estimated 0.169 μAmM cm, 0.02 μM, respectively. The sensor response was studied to determine AA content in orange juice as real sample.