Güler, Emrah2023-12-252023-12-252022Güler, E. (2023). Polyphenols, organic acids, and their relationships in red grapes of Vitis vinifera and Isabella (Vitis labrusca) under arid conditions. European Food Research and Technology, 249(4), 913-921.1438-23771438-2385http://dx.doi.org/10.1007/s00217-022-04183-9https://hdl.handle.net/20.500.12491/11920Grape is one of the most valuable sources of polyphenols that act as radical scavengers and stress suppressors. This study discussed the polyphenolic and the organic acid composition regarding ecology and secondary metabolism of red grapes of two Vitis vinifera varieties (Sulun Kara and Tombak Kara) and a Vitis labrusca cultivar (Isabella) grown under arid conditions. Isabella, a grape adapted to high humidity, had notably higher flavonoids, particularly catechin. Vitis vinifera varieties contained higher phenolic acids than Isabella, except for syringic, p-coumaric, and gallic acids. Organic acids were divergent among the varieties and Isabella. Correlation analysis suggested some noteworthy relations among organic acids, such as the positive linear relationships of malic, tartaric, and ascorbic acids. Oxalic acid was negatively correlated to other organic acids except for succinic acid. High correlations among flavonoids suggested an enhanced stress defense metabolism caused by rain scarcity during the growing season. This study will be a helpful example of alterations in grape biochemical composition and relationships of secondary metabolites. The results also suggest that Isabella is an excellent genetic source of biochemically fortified berries under arid conditions.eninfo:eu-repo/semantics/closedAccessGrapePhenolic AcidsFlavonoidsPhenolic-CompoundsNortheast RegionVarietiesArticle10.1007/s00217-022-04183-9249:9139212-s2.0-85143429387Q2WOS:000894649400001Q2