Organic acids, sugars, phenolic compositions and antioxidant capacities of orange juice and orange wine
obtained from the cv. Kozan of Turkey were determined. High-performance liquid chromatographic methods
were used to identify and quantify of these compounds. Three organic acids (citric, malic and ascorbic acids)
and three sugars (sucrose, glucose and fructose) were determined. The major organic acid was found as citric
acid. With regard to sugars, sucrose was present in the largest amounts for orange juice and wine. A total of
13 phenolic compounds were identified and quantified in orange juice and wine, including hydroxybenzoic
acids (2), hydroxycinnamic acids (5), and flavanones (6). Hesperidin, narirutin and ferulic acid were the most
abundant phenolic compounds in orange juice and wine. Antioxidant activities of orange juice and wine
were measured using the DPPH• (2,2-diphenyl-1-picrylhydrazyl) assay, and the antioxidant capacity of
orange juice was found to be higher than that of orange wine.