In vitro antioxidant activity of two different extracts of Moringa oleifera leaves from Caribbean St. Lucia Island

In this study we evaluated ethanol and hot water extracts from young leaves of moringa plants growing on the island of St.
Lucia.
The dry matter, total phenol content, antioxidant activity against superoxide radicals, hydroxyl radicals and FRAP were evaluated.
Content of dry matter (DM), total phenols (mg GAE L^‑1) and total phenols calculated to DM (mg GAE g^‑1 DM) were statistically significantly higher in the ethanol extract in comparison to the hot water extract.
Antioxidant activity against superoxide and hydroxyl radical were comparable for both extracts, but the antioxidant activity calculated on the dry matter was significantly higher for the hot water extract.
Ferric reducing ability of plasma (FRAP) assay was in both cases (determined in µmol L^‑1 and recalculated in µmol L^‑1 g^‑1 DM) statistically significantly higher for the hot water extract in comparison to the ethanol extract.
Finally, secondary metabolites extracted by hot water (probably phenolic acids) have (relatively) higher antioxidant activity than polyphenols in the 70% ethanol extract.

II International Symposium on Moringa

J. Fejér, I. Kron, D. Gruľová, A. Eliašová

antioxidant activity, hot water extract, ethanol extract, leaves

https://doi.org/10.17660/ActaHortic.2021.1306.17