A Comparative Study of Three Brassicaceae Vegetables Grown in Canakkale: Determination of Total Phenolic Content and Antioxidant Activity of Pulp and Juice Samples of Radish (Raphanus sativus L.), Cabbage (Brassica oleracea L. var capitata L) and Cauliflower (Brassica oleracea L.)

Authors : Ferah CÖMERT ÖNDER, Nuriye DOĞRULAR, Ecem GÜZDÜZALP, Sedef BARLAK, Mehmet AY

Pages : 30-38

Doi:10.28979/comufbed.633456

View : 18 | Download : 10

Publication Date : 2020-05-22

Article Type : Research Paper

Abstract :Brassicaceae that contains well known species from genus Brassica is an important family for crucifers, cabbage etc. The main goal of this study was to investigate the total phenolic contents and antioxidant activities of 25% aqueous ethanol and methanol extracts of selected vegetable pulps such as radish, cab-bage, and cauliflower. These analyses were also applied to the freshly prepared juices. For this purpose, studied vegetables which were grown in villages of Canakkale were obtained from district bazaar in Canakkale. Antioxidant activities of selected vegetables have been determined by using DPPH (2,2-diphenyl-1-picryl-hydrazyl-hydrate) free radical, ABTS ((2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) radical scavenging assay and CUPRAC (cupric reducing antioxidant capacity) method. Total phenolic content was determined by using Folin-Ciocalteu reagent. The results show that total phenolic contents in pulp extracts of 25% aqueous ethanol of red cabbage (1071 ± 25.12 mg FAE/100 g) and brussels sprout (594.00 ± 13.93 mg FAE/100 g) have higher than the other used vegetables. The 25% aqueous ethanol extracts of white and red radish pulps showed the greatest IC50 value with DPPH assay (50.00 µg/mL). The higher phenolic content in the ethanol and methanol extracts of red cabbage may contribute to its increasing CUPRAC activity (4.73 ± 0.11 and 4.78 ± 0.11 quercetin equivalent of flavonoid concentra-tion). In addition, black radish juice showed the highest inhibition value with ABTS assay (70.83 ± 1.83%). This study which may be important for food and health applications, also emphasizes the im-portance of the cultivation area and the valuable parts of vegetables.
Keywords : Antioxidant activity, Brassicaceae, cabbage, cauliflower, radish