title: Bioactivity and phenolic composition from natural fermented table olives.
abstract: In the present work, the phenolic composition, and antioxidant and antimicrobial properties of twenty-four samples of naturally fermented table olives from the northeast of Portugal were evaluated. The analysis of phenolic composition was performed by HPLC/DAD, and ten compounds were identified, hydroxytyrosol, verbascoside derivate and hydroxytyrosol glycol being the most abundant. Total phenolic content varied between 2.37 and 64.17 μg mg(-1) of extract. The IC50 values from the antioxidant activity methods tested varied between 0.30 and 1.66 mg mL(-1) for reducing power, and between 0.13 and 0.83 mg mL(-1) for DPPH. The results obtained in the antioxidant activity were extremely significantly correlated with the main phenolic compounds as well as with the total phenolic content. A principal component analysis allowed grouping the samples according to their phenolic composition and antioxidant potential. Table olive extracts were able to inhibit some pathogenic microorganisms, mainly Gram-positive bacteria. Higher antimicrobial inhibition was recorded in the extracts rich in phenolic compounds and higher antioxidant potential.
authors.affiliation: Mountain Research Centre (CIMO), School of Agriculture, Polytechnic Institute of Bragança, Campus de Santa Apolónia, Apartado 1172, 5301-855 Bragança, Portugal. rmalheiro@ipb.pt jpereira@ipb.pt.
authors.forename: Ricardo
authors.initials: R
authors.lastname: Malheiro
authors.forename: Patrícia
authors.initials: P
authors.lastname: Mendes
authors.forename: Fátima
authors.initials: F
authors.lastname: Fernandes
authors.forename: Nuno
authors.initials: N
authors.lastname: Rodrigues
authors.forename: Albino
authors.initials: A
authors.lastname: Bento
authors.forename: José Alberto
authors.initials: JA
authors.lastname: Pereira
mesh_terms: D000975:Antioxidants / Q000737:chemistry* / Q000494:pharmacology; D005285:Fermentation; D006094:Gram-Positive Bacteria / Q000187:drug effects; D031658:Olea / Q000737:chemistry*; D010636:Phenols / Q000737:chemistry* / Q000494:pharmacology; D010936:Plant Extracts / Q000737:chemistry* / Q000494:pharmacology
chemical_list: D000975:Antioxidants; D010636:Phenols; D010936:Plant Extracts