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

Journal of Agricultural and Food Chemistry
Hamutal Borochov-NeoriMichael Aviram

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.

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Citations

Aug 1, 2015·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Ismail HamadSamy Selim
Mar 31, 2017·Current Pharmaceutical Design·Ryszard Amarowicz, Ronald B Pegg
Feb 26, 2019·Journal of the Science of Food and Agriculture·Juan Martín-GómezMaría P Serratosa
Jun 8, 2017·Frontiers in Plant Science·Reem A Al-AlawiYounis Baqi
Jan 14, 2020·Cardiology Research and Practice·Yuewen WangWaseem Hassan
May 1, 2021·International Journal of Molecular Sciences·Yousef A Al-DashtiRobert M Hackman

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