COMPARISON OF ANTIOXIDANT ACTIVITY AND PHENOLICS CONTENT OF THREE VARIETIES OF ALGERIAN COMMON DATES

Abstract

The date palm is a typical plant of the arid and semi arid areas. Unfortunately in fact they are not all the varieties that profits from an economic interest except for Deglet-Nour. Thus, it represents a danger to the genetic inheritance and the biodiversity. in this study. was to investigate the antioxidant of methanol water extracts from three date palm fruit (DPF) common varieties, Degla Baidha (DB), Tamjhourt (Tam), and Tafezauine(Taf) , from the Ouargla region (Algeria),The antioxidant capacities of these varieties were evaluated by using different methods, namely ABTS.+ (2,2'-azino-bis-(3- ethylbenzthiazoline-6-sulphonic acid)) scavenging activity expressed as Trolox equivalent antioxidant capacity (TEAC), DPPH (2,2-diphenyl-1-picrylhydrazyl ) radical scavenging activity, Reducing power expressed as Ascorbic acid equivalents antioxidant capacity (AEAC). Total phenol content (TPC) was determined by using Folin–Ciocalteau Reagent. Total flavonoid content (TFC) was determined by using aluminum chloride method. ABTS radical cation scavenging activity (Trolox equivalent), the TEAC values decreased in the order of DB>Tam>Tef. Effective scavenging concentration (IC50) on DPPH radical decreased in the order of Tam>DB>Tef. Effectiveness in reducing powers was in a descending order of Tam >DB>Tef. The TPC was found from 41.8 to 84.73 mg/100g gallic acid equivalents, the order of TPC of DPF is: DB>Tef>Tam, while TFC to vary from to vary from 7.52 to 14.1 mg/100g rutin equivalents and in a descending order of DB>Tam >Tef. These results suggest that all date varieties serve as a good source of natural antioxidants and could potentially be considered as a functional food or functional food ingredient.