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J Agric Food Chem. 2015 Apr 1;63(12):3189-95. doi: 10.1021/jf506094r. Epub 2015 Mar 24.

Antioxidant and antiatherogenic properties of phenolic acid and flavonol fractions of fruits of 'Amari' and 'Hallawi' date (Phoenix dactylifera L.) varieties.

Author information

1
†Southern Arava Research and Development, M. P. Hevel Eilot 88820, Israel.
2
‡The Lipid Research Laboratory, Rappaport Faculty of Medicine and the Rappaport Family Institute for Research in the Medical Sciences, Technion-Israel Institute of Technology, Rambam Medical Center, Haifa 31096, Israel.

Abstract

Date (Phoenix dactylifera L.) fruit phenolic-acid or flavonol fractions were examined in vitro for antioxidant and antiatherogenic properties. Two fractions of each subgroup were prepared from two date varieties, 'Amari' and 'Hallawi', by solid phase extraction on C18. The fractions were analyzed for phenolics composition by RP-HPLC and tested for ferric-reducing antioxidant power, free radical scavenging capacity, inhibition of Cu(2+)-induced LDL oxidation, and enhancement of HDL-mediated cholesterol efflux from macrophages. All four fractions exhibited variable capacities to reduce ferric ions, scavenge radicals, and inhibit LDL oxidation. Flavonol fractions were considerably better inhibitors of LDL oxidation compared to phenolic acid fractions, with IC50's of 9-31 nmol GAE mL(-1) compared to 85-116 nmol GAE mL(-1), respectively. Only the flavonol fractions stimulated cholesterol removal from macrophages. Within each subgroup, the levels of all the activities varied with fraction composition. The results demonstrated strong structure-activity relationships for date phenolics and identified date flavonols as potential antiatherogenic bioactives.

KEYWORDS:

Phoenix dactylifera L.; antiatherogenic; antioxidants; date fruit; flavonols; phenolic acids

PMID:
25765921
DOI:
10.1021/jf506094r
[Indexed for MEDLINE]

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