Abstract
Gaseous ozone treatments on wine grapes were already proposed in literature for the postharvest control of microbiota [1], assuring the safety and quality management of wine production. Some authors pointed out the possible effect of ozone treatments with regards to elicitor actions towards stilbenes contents [2], but only on table grapes.\r\nTo evaluate the effect at high ozone concentrations, a study was conducted on Vitis vinifera L. cv. Moscato bianco, a white grape cultivar used for the production of sweet and passito wines. Two different experiments were carried out: in the first study short exposures (24 and 48 hours) at two different gaseous ozone concentrations (30 and 60 μL/L) was compared to a control sample by means of resveratrol, piceid, piceatannol, and viniferin berry skin contents, analyzed after treatment and after 7 days from the treatment. In the second study, a long exposure to gaseous ozone (30 μL/L) was carried out during grape dehydration (18°C, 80% relative humidity), and then compared with a control sample at 5, 10, 15, 20, and 30 % weight loss points.\r\nA 24 or 48-hours ozone exposure of Moscato grapes shown non-significant changes in resveratrol content, although the higher contents analyzed after treatment and after 7 days from treatment were found in the 48-hours, 60 μL/L treatment.\r\nA longer exposure during grape dehydration evidenced that resveratrol contents decreased in both control and treated samples during dehydration with respect to fresh grapes, with a steep decrease until 10 % of weight loss, followed by a slight increase at 15 and 20 % points. At the end of the dehydration process there were almost no differences between control and ozone-treated samples.\r\nThe dehydration phase comprised between 10 and 15 % weight loss confirmed as critical for the postharvest dehydration process, even for control and ozone treated samples.
Lingua originale | Inglese |
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Titolo della pubblicazione ospite | In Vino Analitica Scientia 2017 - Analytical Chemistry for Wine, Brandy and Spirits. |
Editore | Geoff Scollary, President of the IVAS Presidium |
Pagine | 149-149 |
Numero di pagine | 1 |
ISBN (stampa) | N/A |
Stato di pubblicazione | Pubblicato - 2017 |
Keywords
- grape
- ozone
- post-harvest
- resveratrol