Antioxidant Capacities and Phenolic Profiles of Ottoman Strawberry Fruit and Ottoman Strawberry Jam

Abstract

The objective of this study was to quantify the antioxidant capacity of four wild strawberry cultivars (Ottoman) harvested in Elazig, Alkaya, Kargucak and Pences as different species of Fragaria vesca and two Ottoman strawberry jams by various spectrophotometric methods (TPC, CUPRAC, TFC, DPPH, ABTS, FRAP) and to evaluate their phenolic profile by HPLC-DAD. The highest antioxidant capacity was determined in the extracts of Pences cultivar with the concentrations of 60.14, 153.20, 45.08 mg TROLOX/g of dry weight in FRAP, CUPRAC and DPPH assays respectively. Quercetin, (+) catechin, and gallic acid were detected by HPLC in all strawberry samples in substantial amounts.

The Effect of Different Cooking Methods and Addition of Different Sweeteners on the Physicochemical and Antioxidant Properties of Aronia Marmalade

“…It is based on reducing Fe 3+ ions in the Fe (TPTZ) 3+ mixture present in the radical to be used in the determination of antioxidant activity in tea samples with the FRAP method to the blue-colored Fe (TPTZ) 2+ complex in the acidic medium (Koçak et al, 2018). Antioxidant activity was determined withthe FRAP method by making some changes to the method reported by Koçak et al (2018). The solvents used in the study were prepared as follows;…”

“…TMA (mg/l)=A(MA)(Sf)1000/(ɛ)ʆ MA=449.2 (molecular weight of cyanidin 3-glucoside) Sf=Dilution factor, ɛ=Molar absorptivity ʆ=Layer thickness of the cuvette used in the spectrophotometer (ʆ=1 cm) Total Flavonoid Content (TFC) Total flavonoid content was determined spectrophotometrically according to the method suggested by Koçak et al (2018). First, 0.25 ml of the sample extracts were taken and 1.25 ml of distilled water was added to it.…”

Comparative nutritional and phytochemical analysis of indigenous Pakistani Strawberry varieties along with shelf-life extension using modified atmospheric packaging technology

“…Statistical Analysis: The collected data was analyzed using Statistical Package for Social Sciences (SPSS) version 20. The data values were expressed as means and standard deviation (Mean ± SD) and to check statistically significant differences between groups of strawberries varieties, analysis of variance (ANOVA) techniques was used whereas, Tucky test was used as a post hoc test for comparison of the Means of different parameters as per the guidelines described by (Koçak et al (2018). 1 showed the results of proximate composition of different strawberry varieties (Festival, Chandler and Korona) that indicated moisture, crude protein, crude fiber and nitrogen free extract were affected significantly.…”

Investigation about Various Infusion Conditions on Physical, Chemical and Antioxidant Properties of Clitoria ternatea L. Tea

“…The total flavonoid content in tea samples was determined spectrophotometrically in line with the method proposed by Koçak et al (2018). 0.25 mL of the tea samples extracts were taken, and 1.25 mL of distilled water was added to them.…”

“…It is based on reducing Fe 3+ ions in the Fe (TPTZ) 3+ mixture present in the radical to be used in determining the antioxidant activity of tea samples by the FRAP method to the blue-colored Fe (TPTZ) 2+ complex in acidic medium (Koçak et al, 2018). Antioxidant activity was determined by the FRAP method by making some modifications to the method suggested by Koçak et al (2018). The solvents used in the study were prepared daily as three solutions;…”