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RESEARCH PRODUCT

Antioxidant Bibenzyl Derivatives from Notholaena nivea Desv.

Giuseppina CioffiLorella SeverinoOlga Lock De UgazNunziatina De TommasiCosimo PizzaPaola MontoroAntonio Vassallo

subject

PteridaceaeSpectrometry Mass Electrospray IonizationMagnetic Resonance SpectroscopyAntioxidantStereochemistrymedicine.medical_treatmentLinoleic acidNatural products active principles oxidative stress.Pharmaceutical ScienceArticleAntioxidantsAnalytical Chemistrylcsh:QD241-441chemistry.chemical_compoundlcsh:Organic chemistryDrug DiscoverymedicineBibenzylPhysical and Theoretical Chemistrychemistry.chemical_classificationABTSbiologyPlant Extractsbibenzyl derivativesSuperoxideOrganic ChemistryNotholaenabiology.organism_classificationNMR<em>Notholaena nivea</em>; bibenzyl derivatives; NMR; antioxidants activityEnzymechemistryBiochemistryChemistry (miscellaneous)PteridaceaeMolecular MedicineNotholaena niveaantioxidants activity

description

Four new bibenzyl derivatives were isolated, together with other known bibenzyls, by bioassay-guided fractionation of a CHCl3-MeOH extract of Notholaena nivea Desv. (Pteridaceae) aerial parts. The structures were elucidated by NMR, ESIMS and other spectral analyses. Their antioxidative effects towards superoxide, lipidic peroxidation and the 2,2'- azino-bis-3- ethilbenzothiazoline-6-sulfonic acid (ABTS) radical were assayed. Results showed that the compound 3,12-dihydroxy-5-methoxybibenzyl (6) is the most active compound in the ABTS free-radical scavenging test, while in the coupled oxidation of ȕ-carotene and linoleic acid assay the compound 5,12-dihydroxy-3-methoxydibenzyl-6- carboxylic acid (1) exerted the highest activity after 1h. A superoxide anion enzymatic test was also carried out and the results were confirmed by an inhibition of xanthine oxidase activity assay. The putative protective role played by compounds 1 and 6 on the injurious effects of reactive oxygen metabolites on the intestinal epithelium, using a Caco-2 human cell line, was investigated. H2O2-induced alterations were prevented by preincubating the cells with compounds 1 and 6.

yearjournalcountryeditionlanguage
2011-03-01Molecules
https://doi.org/10.3390/molecules16032527