title: Antioxidant capacity, radical scavenger activity, lipid oxidation protection analysis and antimicrobial activity of red grape extracts from different varieties cultivated in Portugal.
abstract: The aim of this study was to investigate the antioxidant capacity, radical scavenger activity, lipid oxidation protection and antimicrobial activity of grape extracts from 12 different red grape varieties cultivated in Portugal. The mean values of total phenolic content quantified in grape extracts varied from 833.7 to 2005.6 mg/L gallic acid. Antioxidant capacity results showed different values for each grape variety ranging from 3.96 to 32.96 mm/L Fe(II). The scavenger activity values ranged from 15.99% to 54.82% for the superoxide radical and from 11.79% to 29.67% for the hydroxyl radical. The grape extracts with the highest antioxidant capacity had a positive effect on the lipid oxidation protection and induced low peroxide values in butter samples. Finally, concerning antimicrobial activity, grape extracts from Touriga Nacional and Tinta Roriz grape varieties had significant antimicrobial activity, especially notable for total mesophilic aerobics.
authors.affiliation: a Polytechnic Institute of Viseu (Centre for the Study of Education, Technologies and Health), Agrarian Higher School, Estrada de Nelas, Quinta da Alagoa, Ranhados , 3500-606 Viseu , Portugal.
authors.forename: Ana C
authors.initials: AC
authors.lastname: Correia
authors.forename: António M
authors.initials: AM
authors.lastname: Jordão
mesh_terms: D000890:Anti-Infective Agents / Q000494:pharmacology*; D000975:Antioxidants / Q000494:pharmacology*; D016166:Free Radical Scavengers / Q000494:pharmacology*; D005638:Fruit / Q000737:chemistry; D005707:Gallic Acid / Q000737:chemistry; D015227:Lipid Peroxidation; D010084:Oxidation-Reduction; D010936:Plant Extracts / Q000494:pharmacology*; D011174:Portugal; D027843:Vitis / Q000737:chemistry*
chemical_list: D000890:Anti-Infective Agents; D000975:Antioxidants; D016166:Free Radical Scavengers; D010936:Plant Extracts; D005707:Gallic Acid
keywords: antimicrobial activity; antioxidant capacity; grapes; lipid oxidation; scavenger activity