“…Methods of analysis include spectrophotometry, titrimetry, voltammetry, potentiometry, pulse polarography, fluorimetry, liquid chromatography, and flow injection . In spite of the developments in instrumental analytical resources, colorimetric–spectrophotometric methods of AA determination are still of interest due to their low cost, simplicity, and adaptability to optical sensors. However, the precise and selective determination of ascorbic acid in the UV region of interest suffers from interference effects of organic compounds, while visible spectrophotometric methods require a chromogenic redox reagent reluctantly oxidising other phenolic compounds present in sample matrices.…”