This study assessed the total polyphenol, total flavonoid, total flavonols, and condensed tannins contents were also monitored and their antioxidant properties in vitro were investigated using 2,2‐diphenyl‐1‐picrylhydrazyl radical cation, 2,2′‐azino‐bis (3‐ethylbenzothiazoline‐6‐sulfonic acid), ferric reducing antioxidant power, and β‐carotene‐linoleic acid bleaching assay for second‐grade dates (Phoenix dactylifera L.), from 10 Tunisian cultivars. The results prove that the methanolic extracts of date fruits are a rich source of phenolic compounds. In addition, a positive linear correlation (p<0.05) between the phenolic compounds and antioxidant activity was found. The major phenolic compounds identified and quantified by LC‐ESI‐MS were the trans‐ferulic and syringic acids for the majority of cultivars. In this way, these results contribute to enhancing the value of the date fruits might be more widely used by both fresh consumers and food industry as a source of natural antioxidants in the diet or as natural food additives in benefit of human health. Practical applications It is known the benefits of phytochemical compounds and antioxidant activity in the nutrition and the health of human. These chemicals offer protection to many chronic diseases such as diabetes, cancer, heart disease, and Alzheimer's. For that, it is indispensable to determine the richness of our alimentation in these elements. This study aims to characterize the photochemical ingredients and antioxidant activity of 10 varieties of common dates (Phoenix dactylifera L.) to valorize them in food industry or in pharmaceutical industry as bioactive source for human.

The objective of this study was to assess the impact of pulsed electric field (PEF) treatment on the extraction of polyphenolics and antioxidant activity from downgraded date palm fruits. The PEF pretreatments (frequency: 30 Hz, time: 50 μs, pulse number: 240, the electric field strengths were found to be 1, 2, and 2.5 kV.cm⁻¹, and methanol (50%) and temperatures (20, 40, 50 °C)) were optimized and applied before extraction to produce an extract of date fruits with a high content of bioactive compounds. The extracts obtained immediately after pretreatments were analyzed for total polyphenolic content, antioxidant activity, and phenolic profiles. The results revealed that the PEF-assisted extracts at 2.5 kV.cm⁻¹ at T₅₀ °C exhibited higher polyphenol content (+27%) and antioxidant activity (+31%) and notably improved phenolic profiles compared to untreated extracts. PEF treatment processing significantly enhanced the bioactive components and antioxidant activities of date fruits over time, regardless of the treatment applied and the extraction’s temperature. Hence, the application of PEF combined with thermal processing can be an appropriate alternative treatment for a better extractability of bioactive compounds from fruit of dates and food byproducts. These biomolecules could be consumed as new food technology, incorporated as food additives, and nutraceuticals products.

This study addresses the development of unpollinated and pollinated flowers of date palm (Phoenix dactylifera L.). cv. Deglet Noor in three successive seasons (2015–2017), focusing on the physico-chemical characterization and functional properties of fruits at Kimri stage. Results showed for the first time that dropped fruits at Kimri stage have a clear beneficial action on human health compared even with Tamar stage, given its higher total polyphenols and antioxidant activity, 3 and 34 times superior to Tamar stage, respectively.