Postharvest UV-C irradiation stimulates the non-enzymatic and enzymatic antioxidant system of ‘Isabel’ hybrid grapes (Vitis labrusca×Vitis vinifera L.)
2017
Maurer, Luana Haselein | Bersch, Andriely Moreira | Santos, Roberta Oliveira | Trindade, Simone Cezar | Costa, Eduarda Lasch | Peres, Marcelle Moreira | Malmann, Carlos Augusto | Schneider, Mauricio | Bochi, Vivian Caetano | Sautter, Claudia Kaehler | Emanuelli, Tatiana
Ultraviolet light type C (UV-C) was studied as a tool to increase enzymatic and non-enzymatic antioxidant defenses and phytochemical levels in ‘Isabel’ grapes (Vitis labrusca×Vitis vinifera L.). Grapes were exposed to 0, 0.5, 1.0, 2.0, or 4.0kJm−2 UV-C and stored for 1, 3, or 5days post-treatment. One day after UV-C irradiation, the activities of grape antioxidant enzymes and thiols were increased, especially at 1.0 and 2.0kJm−2. These doses increased total phenolic content by almost 20%, while 0.5 and 4.0kJm−2 had no effects. Total monomeric anthocyanin content was increased by >35% by UV-C at 1.0kJm−2; however, anthocyanin profile was unchanged. Grape skin antioxidant capacity was also improved by UV-C irradiation. The 1.0kJm−2 UV-C was considered the hormetic dose. Postharvest UV-C had an elicitor effect on ‘Isabel’ grapes, positively impacting the antioxidant capacity and phytochemical content.
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