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A comparative study of total phenolics, antioxidant activity and anthocyanins of three Algerian dates varieties

Research Paper | December 1, 2017

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Kheira Zerrouki, Ali Riazi, Jacqueline Destain, Philippe Thonart

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Int. J. Biosci.11( 6), 16-26, December 2017

DOI: http://dx.doi.org/10.12692/ijb/11.6.16-26


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The objective of this study was to compare phenolic profile of three varieties of Algerian dates, and the use for the first time of the oxygen radical absorbance capacity (ORAC-FL) to determine antioxiadant capacity of dates. Total phenolics using Folin-Ciocalteu reagent and the anthocyanins by the pH differential method in three varieties of dates (DgletNour, Ajwa and Ghars). The results obtained were expressed as means of three replicate ± standard deviation (n = 3) on a fresh weight basis. Total polyphenolics values were about 97.16 ±1.25 and 245.32 ± 13.12 and 246 mg/100 g Ferrulic Acid Equivalent (FAE) for Deglet-Nour variety (water/aceton extraction) respectively. In the same order of solvents used. The varieties (Ghars and Ajwa) have presented total phenolics concentrations: (73.81±0.81; 86.63 and 64.77±0.42; 81.11) mg/100 g FAE. These dates’ varieties have shown a good result of total anthocyanins (0.91; 0.75 and 0.56 mg equivalent cyanidine3-glucoside /100g for the varieties Deglet-Nour, Ajwa and Ghars in the same order. ORAC-FL have presented a high results compared by other methods ((DPPH, ABTS, FRAP and TEAC). High values were registred for Deglet-Nour (4844 and 4818.67 ±32.14) µ moles equivalent trolox/100 g and 3891µ moles for Ajwa. Only 2648 µ moles equivalent trolox /100 g were registered for Ghars variety. The temperature effect on pH and total phenolics content was equally tested in this study. In this work, we have added a new conclusion about the high nutrition value of Deglet-Nour variety.


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A comparative study of total phenolics, antioxidant activity and anthocyanins of three Algerian dates varieties

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