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This study investigates the polyphenol content of Diplotaxis simplex extract and the biological activities of the main organ. The analysed extracts showed that polyphenol contents varied considerably as a function of organs. Furthermore, novel biological activities of this species were assessed. Flower extracts exhibit a potent in vitro antioxidant capacity using oxygen radical absorbance capacity and displayed a strong anti-inflammatory activity, inhibiting nitric oxide release, by 79.3% at 160 μg/mL. Our findings suggested that the Diplotaxis flower is a valuable source of antioxidants and anti-inflammatory agents.

In the present study, shoot extracts from edible halophytic Mesembryanthemum species were evaluated for their effects against O 2 - , DPPH, and ABTS radicals. The reducing power, chelating ability, inhibition of lipid peroxidation and of β-carotene bleaching were also evaluated. Moreover, the total phenolic, flavonoid, and condensed tannin contents were determined. In vitro biotests showed a significant difference in the antioxidant capacities of the species studied. Mesembryanthemum edule was found to exhibit the higher antioxidant activity, except for the iron-chelating test where M. crystallinum showed the best activity with the lowest EC50 value (2.13 mg ml−1). Accordingly, M. edule exhibited high phenolic levels, especially in total phenols (70 mg of gallic acid equivalents/g dry weight), while no significant difference was found between M. crystallinum and M. nodiflorum (1.4 and 1.7 mg GAE g−1DW, respectively). Due to its strong antioxidant activities and high levels of phenols, M. edule was further studied for its phenolic constituents. HPLC analysis revealed 12 compounds, mainly flavonoids, with phloretin, quercitrin, and avicularin as the most abundant (1, 0.84 and 0.66 mg g−1 DW, respectively). These results evidenced the great variability in antioxidant capacities of these halophytes and suggested that M. edule might be an important source of functional phenolic compounds.

International audience; In the present study, shoot extracts from edible halophytic Mesembryanthemum species were evaluated for their effects against View the MathML source, DPPH, and ABTS radicals. The reducing power, chelating ability, inhibition of lipid peroxidation and of β-carotene bleaching were also evaluated. Moreover, the total phenolic, flavonoid, and condensed tannin contents were determined. In vitro biotests showed a significant difference in the antioxidant capacities of the species studied. Mesembryanthemum edule was found to exhibit the higher antioxidant activity, except for the iron-chelating test where M. crystallinum showed the best activity with the lowest EC50 value (2.13 mg ml−1). Accordingly, M. edule exhibited high phenolic levels, especially in total phenols (70 mg of gallic acid equivalents/g dry weight), while no significant difference was found between M. crystallinum and M. nodiflorum (1.4 and 1.7 mg GAE g−1DW, respectively). Due to its strong antioxidant activities and high levels of phenols, M. edule was further studied for its phenolic constituents. HPLC analysis revealed 12 compounds, mainly flavonoids, with phloretin, quercitrin, and avicularin as the most abundant (1, 0.84 and 0.66 mg g−1 DW, respectively). These results evidenced the great variability in antioxidant capacities of these halophytes and suggested that M. edule might be an important source of functional phenolic compounds.