Chemical characterization and in vitro antioxidant capacity of nine Algerian date palm cultivars (Phoenix dactylifera L.) seed oil

Abstract

Date pits are another major date palm crops and low grade rejected, used locally in the management of diabetes and as animal feed ingredient or turned into non-caffeinated coffee by the Arabs although their richness with valuable bioactive and antioxidant compounds. In this study and for the first time, lipids, fatty acids profiles, total tocopherols and sterols of nine (9) Algerian date palm cultivars (Phoenix dactylifera L.) seed oil were investigated and their antioxidant activities were evaluated. Oil yield ranged from 4.86% to 6.7%. Gas liquid chromatography revealed that the oil fraction contained unsaturated fatty acids in majority with the preponderance of oleic acid (37.83-55.00%) followed by lauric and myristic acids (6.63-25.36% and 9.30-19.33%) respectively. The study of the unsaponifiable fraction revealed the presence of sterols and tocopherols. The sterols contents ranged from 4.7 to 8.45 mg/g DW. Whereas, the levels of total tocopherols ranged from 0.32 to 0.74 mg/DW, which ␣-tocopherol was the predominant tocopherol (15.57%-74.1%) followed by (␤ + ␥)-tocopherol (25.12%-56.01%). The antioxidant activity of date seeds oil was determined with DPPH radical scavenging assays. The oils had a moderate bleaching effect on DPPH free radicals, where Ghars (GH), Sbo3 Lossif (SL) and Timjhourt (TIM) seed oils were the active ones. The richest of date seed oil by active components such sterols, tocopherols also high amounts of oleic, lauric and other fatty acids suggest it to be as a useful source of edible oils for human consumption as well as using as additives in food, for medicinal use, in cosmetics, pharmaceuticals and food industries.

Date Seeds: A Promising Source of Oil with Functional Properties

“…Nehdi et al [ 11 ] showed that date seed oil from six Saudi Arabian cultivars contained seven tocols, namely α-tocopherol, β-tocopherol, γ-tocopherol, δ-tocopherol, α-tocotrienol, γ-tocotrienol, and δ-tocotrienol. However, oils from different varieties or origins had different qualitative and quantitative tocol compositions [ 10 , 28 , 42 ].…”

“…According to Laghouiter et al [ 28 ], the sterol contents varied between 4.70 and 8.45 mg/g. These values are similar to other seed oils, such as soybean (9 mg/g) and rapeseed (5 mg/g) [ 46 ].…”

Effect of Seasonal and Regional Variations on Phenolic Compounds of Deverra scoparia (Flowers/Seeds) Methanolic Extract and the Evaluation of Its in Vitro Antioxidant Activity

“…DPPH . (2,2‐diphenyl‐1‐picrylhydrazyl) test was done in triplicate according to the method reported in ref . 0.5 mL of different extract concentrations was mixed with 0.5 mL of methanolic‐DPPH .…”

Technologies for the Development of New Value-Added Foods From Dates and Their Processing by-Products

“…When compared to the pulp, date pits contain a higher quantity of protein and fat and are also high in dietary fiber (Table 1) (Baliga et al 2011;Bouhlali et al 2017). They have many other benefits, such as vitamins, minerals, carotenes, and other chemicals that may prevent cancer and heart disease (Bouhlali et al 2017;Laghouiter et al 2018). Date palm seeds contain 5-12% oil with the predominant of oleic acid followed by linoleic, lauric, palmitic, and stearic acids (Laghouiter et al 2018).…”