Phenolic profile and free radical-scavenging activity of Cabernet Sauvignon wines of different geographical origins from the Balkan region.
BACKGROUND
The phenolic profile, determined by the relative proportions of different phenolic compounds, is characteristic for each grape variety and its corresponding wine. The aim of this study was to determine the phenolic and hydroxycinnamate acid, flavan-3-ol and flavonol contents and free radical-scavenging activity of single-cultivar (Cabernet Sauvignon) wines from selected Balkan vineyard regions by spectrophotometric methods and high-performance liquid chromatography with photodiode array and fluorescence detection.


RESULTS
The contents of phenolic compounds varied depending on the agroclimatic factors and oenological practices of the vineyard region. The antioxidant activity of wine samples was estimated by their ability to scavenge the stable 2,2'-diphenyl-1-picrylhydrazyl free radical (DPPH). All wines showed high DPPH-scavenging activity (70.03-83.53%, mean 73.76%). Significant correlations between catechin (R(2) = 0.8504) and quercetin (R(2) = 0.8488) concentrations and DPPH-scavenging ability of the wines were found.


CONCLUSIONS
The concentrations of the main components catechin and quercetin can be used as biochemical markers for the authentication of red grape cultivars and their corresponding single-cultivar wines.
Radovanović
Blaga C
BC
Department of Chemistry, Faculty of Science and Mathematics, Višegradska 33, 18000 Niš, Serbia. blaga_radovanovic@yahoo.co.uk
Radovanović
Aleksandra N
AN
Souquet
Jean-Marc
JM
D015415:Biomarkers / Q000032:analysis; D001713:Biphenyl Compounds / Q000378:metabolism; D002392:Catechin / Q000032:analysis*; D002980:Climate; D005061:Europe, Eastern; D005419:Flavonoids / Q000032:analysis; D016166:Free Radical Scavengers / Q000378:metabolism*; D005638:Fruit / Q000737:chemistry*; D010636:Phenols / Q000032:analysis; D010851:Picrates / Q000378:metabolism; D059808:Polyphenols; D011794:Quercetin / Q000032:analysis*; D013045:Species Specificity; D027843:Vitis / Q000737:chemistry* / Q000145:classification; D014920:Wine / Q000032:analysis*
D015415:Biomarkers; D001713:Biphenyl Compounds; D005419:Flavonoids; D016166:Free Radical Scavengers; D010636:Phenols; D010851:Picrates; D059808:Polyphenols; D002392:Catechin; D011794:Quercetin; C004931:1,1-diphenyl-2-picrylhydrazyl