Caracterização físico-química, sensorial e atividade antioxidante de sucos de uva e blends, produzidas no sudoeste de Minas Gerais

Abstract

The present study aimed to characterize physico-chemically and sensorially juices and blends from different grape cultivars produced in southwestern Minas Gerais and evaluate the antioxidant activity of them. Grapes were harvested, cleaned, sanitized and had the seeds removed. The production of grape juices ‘Bordô’ (100%), ‘Isabel Precoce’ (100%), ‘BRS Violeta’ (100%) and ‘BRS Rúbea’ (100%) as well as the production of blends ‘Niagara Rosada’ x ‘BRS Cora’ (50% + 50%), ‘Niagara Rosada’ x ‘BRS Cora’ x ‘BRS Violeta’ (40% + 30% + 30%) and ‘Isabel Precoce’ x ‘Niagara Rosada’ x ‘BRS Cora’ (25% + 25% + 50%) was performed by vapor drag. The prepared products was, then, packed in glass bottles and stored at 18 º C ± 2 º C for 120 days. Analyzes of pH, total soluble solids, titratable acidity, soluble solids/titratable acidity ratio, color (L *, chroma and ohue) anthocyanins, antioxidant activity (DPPH and β-caroteno/linoleic acid), total phenolics, vitamin C, organic acids and sensory evaluation, were performed aiming to characterize the juices and blends over the period of storage. Among the grape cultivars evaluated, we suggest the consumption of grape juice from hybrid ‘BRS Violeta’ due to its higher antioxidant activity, higher levels of anthocyanins, phenolic compounds, vitamin C, malic acid content, as well as better physic-chemical characteristics. As for blends, the ‘Niagara Rosada’ x ‘BRS Cora’ x ‘BRS Violeta’ showed higher contents of anthocyanins and vitamin C, lower acidity and higher soluble solids/titratable acidity ratio, indicating a better balance between sweet and acidic flavors. Sensory tests showed that tasters preferred grape juice from cultivars ‘Bordô’ and hybrid ‘BRS Rúbea’ produced in southwestern Minas Gerais. Furthermore, we suggest the development of the blend Niagara Rosada x BRS Cora x BRS Violeta (40% + 30% + 30%) as an alternative to color in juices deficient in this aspect.