Antioxidant activity of various Mauritanian date palm (Phoenix dactylifera L.) fruits at two edible ripening stages

Abstract

The increasing interest in plant phenolics and flavonoids outlined the necessity of determining their contents and biological activity in Mauritanian date palm fruits. Methanolic extracts of fruit of six date palm cultivars commonly grown in Mauritania were screened for their antioxidant activity, total phenolics, and flavonoid content at two edible ripening stages. Polyphenols and flavonoids were higher in theBlah stage, corresponding toKhalal in the standard Iraqi Arabic nomenclature, compared to the fully matureTamr stage regardless the cultivar. The average of total phenolics atBlah andTamr stages were 728.5 and 558.9 mg gallic acid equivalents (GAE) per 100 g dry matter (DM), whereas the average flavonoid content was 119.6 and 67.3 mg quercetin equivalents (QE) per 100 g DM, respectively. TheBlah stage also exhibited the highest total antioxidant activity with a Trolox equivalents antioxidant capacity (TEAC) value of 129.3 μmol/100 g DM founded in Bou seker's Blah date, followed by Tijib cultivar with TEAC value of 114.3 μmol/100 g DM and an average TEAC value of 107.5 μmol/100 g DM. Furthermore, a high positive correlation was found between total phenolics inTamr (r = 0.92) andBlah (r = 0.87) stages and TEAC of fruit methanolic extracts compared to the flavonoids, suggesting that phenolics were the major contributor to the antioxidant activity.

Phytochemicals, Antioxidant Activity and Ethnobotanical Uses of Balanites aegyptiaca (L.) Del. Fruits from the Arid Zone of Mauritania, Northwest Africa

“…Antioxidant activity of fruit pulp methanolic extracts was estimated using the 2,2-diphenyl-1pyrrylhydrazyl (DPPH) free radical assay as described by Brand-Williams et al [54] and Mint Mohamed Lemine et al [55]. The Absorbance was measured at 517 nm.…”

Date palm (Phoenix dactylifera L.) fruit as potential antioxidant and antimicrobial agents

“…(2014). [16] The results showed that polyphenols and flavonoids were higher in the Blah stage compared to those in the fully mature Tamr stage from all cultivars, with average total phenolics at the Blah and Tamr stages being 728.5 and 558.9 mg gallic acid equivalents (GAE)/100 g of dry matter, respectively, and average flavonoid content of 119.6 and 67.3 mg quercetin equivalents/100 g of dry matter, respectively. The Blah stage also had the highest total antioxidant activity, followed by Tijib, and a higher positive correlation was observed for total phenolics in both Tamr and Blah stages and antioxidant activities, compared to the flavonoids.…”

“…The Blah stage also had the highest total antioxidant activity, followed by Tijib, and a higher positive correlation was observed for total phenolics in both Tamr and Blah stages and antioxidant activities, compared to the flavonoids. [16]…”

Bioactive Compounds of California Fan Palm Washingtonia filifera (Linden ex André) H. Wendl. ex de Bary

“…The maturity stage is an important factor that may influence the compositional quality of the fruit [14,15]. During fruit ripening, several biochemical, physiological, and structural modifications occur and consequently influence the fruit quality [14][15][16]. Fat content of ripe and overripe fruit was 8.58% and 0.56%, respectively (Table 1).…”

“…Hence, it could be potentially used for the production of bioethanol similar to that of W. robusta in which bioethanol yield was found to be 71.42 AE 1.4 g ethanol/kg fruit [19]. [16]. Reduction in total phenolics, flavonoids, and condensed tannins occurs during maturation from the Khalal to Tamer stages, with the highest content at the Khalal stage [14].…”