Redox spectrophotometric method involving electrolytically generated manganese(III) sulphate with diphenylamine for the determination of ascorbic acid present in the samples of various fruits, commercial juices and sprouted food grains

Cu-based metal–organic framework HKUST-1 as effective catalyst for highly sensitive determination of ascorbic acid

“…14 Nowadays, diverse methods have been developed to improve the detection of AA, including ultra-and high-performance liquid chromatography (UPLC or HPLC), 15 capillary electrophoresis, 16 uorescence spectroscopy 17 and UV-Vis spectroscopy. 18 Beyond these, electrochemical techniques are oen applied, which are easy to implement and not expensive. 19 With modied electrode surface, the electrochemical response is promoted enormously, and the lower limit of detection (LOD) and wider linear range are accessed.…”

Folin–Ciocalteu spectrophotometric assay of ascorbic acid in pharmaceutical tablets and orange juice with pH adjustment and pre‐extraction of lanthanum(III)–flavonoid complexes

“…Ascorbic acid (AA, vitamin C) is an essential water‐soluble vitamin in the human diet participating in many biological processes . It is commonly found in fruits and vegetables, and may also be added to a group of food products in order to improve antioxidant properties . By interfering with oxidative–reductive metabolic processes in an organism, ascorbic acid keeps the balance among some enzymatic groups .…”

“…Many analytical procedures have been developed and improved for the accurate and specific determination of ascorbic acid in pharmaceuticals and other natural samples that are important in the human diet. 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.…”

“…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.…”

A sensitive and selective chemosensor for ascorbic acid based on a fluorescent nitroxide switch

“…A wide variety of analytical methods is available for the determination of ascorbic acid, such as titrimetric [6,7], spectrophotometric [8,9] and chromatographic [10][11][12] methods. These methods rely on different phenomena and registration techniques suffering from several limitations.…”