Voltammetric and spectrophotometric pathways for the determination of total antioxidant capacity in commercial turnip juice

Authors : Merve ÖZTÜRK, Ersin DEMİR, Tugba OZDAL

Pages : 163-172

Doi:10.18596/jotcsa.752982

View : 11 | Download : 5

Publication Date : 2021-02-28

Article Type : Research Paper

Abstract :In this study, total flavonoid substance, total phenolic substance and total antioxidant capacity in turnip juice which made from the turnip insert ignore into journalissuearticles values(Brassica rape);, a plant belonging to the family of Turpgiller insert ignore into journalissuearticles values(Brassicaceae);, and also a drink specific to the Çukurova, were investigated. The turnip juice samples, taken from the turnip juice insert ignore into journalissuearticles values(A sample); and hot turnip juice insert ignore into journalissuearticles values(B); sample in local market, prepared in the laboratory were performed as two different parallel. In addition, electrochemical method was used to evaluate total antioxidant capacity insert ignore into journalissuearticles values(TAC); of turnip juice and hot turnip juice. By the SWSV method, under the optimized experimental conditions was applied for quercetin determination with a limit of detection insert ignore into journalissuearticles values(LOD); and limit of quantification insert ignore into journalissuearticles values(LOQ); of 0.017 and 0.057 mg/L, respectively. These values are satisfactory for application to real food samples for the evaluation of TAC. According to the results carried out by spectrophotometric methods, the highest total phenolic and flavonoid contents and TAC were observed as 13.049±13.40 mg GAE/ml, 37.850±0.70 mg QE/ml and 81.831±3,24 mg TE/100ml, respectively. In addition, the TAC in turnip juice and hot turnip juice were calculated as 573.05±0.43 mg/L and 854.98±9.9 mg/L by SWSV, respectively. The results obtained by voltammetry and spectrophotometry methods for determinations of TAC were in correlation and found to be compatible for the determination of TAC.
Keywords : Antioxidant, Turnip Juice, VOltammetry, Spectrophotometry