Phenolic composition profiling of Tunisian 10 varieties of common dates ( Phoenix dactylifera L.) at tamar stage using LC‐ESI‐MS and antioxidant activity

Abstract

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.

Effect of inulin concentration on physicochemical properties and antioxidant activity of date powders obtained by hot-air tray dryer

“…CTC of fresh date paste was 101.62 mg CE/100g in our study (Table 2). Our finding partially agrees with the CTCs of Algerian (74.22-394.27 mg CE/100g), Tunisian (41.85-102.37 mg CE/100g), and Moroccan (57.56-92.14 mg CE/100g (dw)) date fruits at Tamr stage (Arem et al, 2013;Benmeddour et al, 2013;Bouhlali et al, 2016;Souli et al, 2018). Total amount of condensed tannins in date palm fruit is lower than hawthorn (920-4110 mg CE/100g) and higher than strawberry (2.93-31.55 mg CE/100g), rosehip (2.02-2.34 mg CE/100g), blackberry (14.28-16.59 mg CE/100g), and blackthorn (9.53-10.50 mg CE/100g) (Dou, Leng, Li, Zeng and Sun, 2015;Turker, Kizilkaya, Cevik and Gonuz, 2012).…”

Phytochemical profiling, polyphenol composition, and antioxidant activity of the leaf extract from the medicinal halophyteThespesia populneareveal a potential source of bioactive compounds and nutraceuticals

“…Free radicals are the major factors responsible for causing many diseases including cardiovascular disease, cancer, neural disorders, ulcerative colitis, and atherosclerosis (Elosta, Slevin, Rahman, & Ahmed, 2017). The previous studies suggest that the intake of dietary antioxidants can protect our system from damage caused by free radicals (Souli et al, 2018). The dietary supplement of anti- 2 ) and hydrogen peroxide (H 2 O 2 ) are produced naturally in cells during cellular oxidation reactions and are the most deleterious radicals causing DNA damage and lipid membrane peroxidation .…”

Female infertility and herbal medicine: An overview of the new findings

“…Various studies have shown the anticancer and anti‐inflammatory effects of this plant, its nephroprotective and hepatoprotective effects, as well as its protective effects against toxicity‐induced reproductive dysfunction in female/male animal models (Taleb et al., 2016 ). The LC‐ESI/MS analysis of the fruit and seed of this plant showed the presence of polyphenolic compounds (isoflavonoids and flavonoids) such as gallic acid, biochanin A‐7‐glucoside, daidzein 7‐O‐D‐glucoside, syringic acid, protocatechuic acid, protocatechuic acid, genistein, p‐hydroxybenzoic acid, proantosinidin, vanillic acid, caffeic acid, syringic acid, p‐coumaric, ferulic acid, mcoumaric acid, and o‐coumaric acid (Souli et al., 2018 ). Studies show that saponins in this plant enhance the blood flow toward the female reproductive system by releasing NO and stimulating the HPG axis (Bahmanpour et al., 2006 ).…”