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Interspecific variability of antioxidant activities and phenolic composition in Mesembryanthemum genus
- Source :
- Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association. 47(9)
- Publication Year :
- 2009
-
Abstract
- 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.
- Subjects :
- Avicularin
Free Radicals
DPPH
Flavonoid
Toxicology
Iron Chelating Agents
chemistry.chemical_compound
Phenols
Picrates
Species Specificity
Botany
Gallic acid
Chromatography, High Pressure Liquid
chemistry.chemical_classification
Flavonoids
Mesembryanthemum
ABTS
biology
Plant Extracts
Biphenyl Compounds
Polyphenols
General Medicine
Free Radical Scavengers
biology.organism_classification
beta Carotene
Quercitrin
chemistry
Indicators and Reagents
Lipid Peroxidation
Food Science
Subjects
Details
- ISSN :
- 18736351
- Volume :
- 47
- Issue :
- 9
- Database :
- OpenAIRE
- Journal :
- Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association
- Accession number :
- edsair.doi.dedup.....36ff111f88854373eee70bacacefb407