Direct and indirect antioxidant activity of polyphenol- and isothiocyanate-enriched fractions from Moringa oleifera.
Level 5 - mechanism / opinion, no new human data
In vitro chemical and cell-culture bench study
PubMed 25605589 · doi:10.1021/jf505014n
What was done
Moringa (*Moringa oleifera*) leaves were extracted and fractionated via fast centrifugal partition chromatography (FCPC) into polyphenol-rich and isothiocyanate-rich fractions. Fractions and purified compounds (4-[(α-l-rhamnosyloxy)benzyl]isothiocyanate and 4-[(4'-O-acetyl-α-l-rhamnosyloxy)benzyl]isothiocyanate) were evaluated for direct antioxidant capacity using the oxygen radical absorbance capacity (ORAC) assay and for indirect antioxidant activity via NAD(P)H quinone oxidoreductase 1 (NQO1) induction in Hepa1c1c7 cells, using sulforaphane as a comparator.
What was found
The abstract reports no numerical values, concentrations, or fold-induction metrics. It reports that moringa polyphenols demonstrated direct antioxidant activity in the ORAC assay, whereas moringa isothiocyanates acted as indirect antioxidants by inducing NQO1. Both purified moringa isothiocyanates exhibited NQO1 induction potency comparable to sulforaphane.
Why it matters
This study demonstrates that moringa contains distinct bioactive fractions with complementary antioxidant mechanisms, identifying specific isothiocyanates that match sulforaphane in inducing phase II detoxification enzymes in vitro.
Limits
The study is entirely in vitro and cell-culture-based, providing no data on bioavailability, pharmacokinetics, or in vivo efficacy in animals or humans. No quantitative data, effect sizes, or confidence intervals are provided in the abstract.
Cited by
- supports Moringin, the primary isothiocyanate found in Moringa, exhibits greater bioactivity or potency than sulforaphane in several laboratory assays.