Phenolic compounds are dependent on cultivation conditions in face of UV-C radiation in ‘Concord’ grape juices (Vitis labrusca)

• DOI: 10.1016/j.lwt.2021.112681
• Publication Date: 2021-10-30T15:42:01Z
• Authors: Ellen Porto Pinto; Ellen Cristina Perin; Igor Bulsing Schott; Elisângela Düsman; Rosane da Silva R...; Luciano Lucchetta; Vitor Manfroi; Cesar Valmor Romb...
• Keywords: Peonidin; Titratable acid

Grape juice is known as a relevant source of compounds with antioxidant potential, which are accumulated during grape growth and development. As these come from specialized metabolism, postharvest stressors may increase the synthesis accumulation metabolites. Thus, UV-C radiation (65.6 J m−2) was applied to 'Concord' grapes (from vineyards grown in conventional organic systems), after harvest. The following dependent variables were analyzed: pH, total titratable acidity, soluble solids, ratio, angle hue, L, a, b, ΔE, phenolic compounds, anthocyanins, malvidin, delphinidin, peonidin, cyanidin, epicatechin, quercetin, kaempferol, trans-resveratrol, cis-resveratrol. treatment did not interfere basic physicochemical composition but resulted juices more intense color. Juice an system subjected had also levels observed same treatment. responses depend on cultivation conditions.