Determination of Certain Secondary Metabolites in Some Varieties of Algerian and Saudian Dates
The date (Phoenix dactyliferal) has many therapeutic properties, which require more in-depth studies on its components. Indeed, phenolic compounds are secondary metabolites of great pharmacological importance, having seen their various biological activities confirmed in a large number of studies. It is in this context that we conducted a study whose objective, was on the one hand, the determination of total phenolic compounds, flavonoids and condensed tannins in the Methanolic extracts of six Algerian date varieties and five Saudi varieties per hectare. The methods of Folin-Ciocalteu, aluminum Trichloride and vanillin respectively and secondly to compare between the Algerian and Saudi varieties at the level of sugars and some micronutrients. Quantitative determination of total Phenolics yielded levels ranging from 51.66 to 528.33 EAG / 100 g extract for Algerian varieties and from 51.66 to 205 EAG / 100 g extract. That of flavonoids varies from 12.5 to 37 EQ / 100 g of extract for Algerian varieties and from 12 to 37 EQ / 100 g of extract for Saudi varieties. That of condensed tannins from 3.95 to 23.95 EC / 100 g of extract for the Algerian varieties and from 8.56 to 16.59 EC / 100 g of extract for the Saudi Arabia varieties.Sugars are the most important constituents of the date; their content is determined by the Brix degree. Dates from Algeria are much richer in nutrients.
Keywords - Agriculture, Nutrition, Health, Dates, Secondary Metabolites.