Follow up of red grape varieties maturation. Part I: synthesis of the results obtained with Gamaret | Suivi de la maturation des raisins de cepages rouges. I. Synthese des resultats sur Gamaret
2007
De Montmollin, S. | Dupraz, Ph. | Guyot, Ch., Ecole d'ingenieurs de Changins, Nyon (Switzerland) | Sieffermann, J.-M.
During the years 2003 to 2005, the ripening of Gamaret was followed on fifteen plots using two methods: sensory analysis of berries and analysis of anthocyanins to monitor the evolution of phenolic compounds. In four cases, berries were harvested at three to four successive dates. Wines were analysed using flash profiling. Sensory analysis of berries provided reliable information on organoleptic qualities of the berries. Descriptors efficiency was influenced by the grape variety and the vintage. A selection of efficient sensory descriptors for Gamaret could be defined. The evolution of anthocyanins in the berries during ripening is independent of other compounds such as sugar and acidity. A better interpretation of anthocyanins measures is obtained using a tendency curve (polynomial of degree two). The wines coming from the last harvest date have the higher colour concentration and are preferred in wine tasting. They are considered more intense, complex, round, vinous and with a better tannic constitution. The third harvest date occurred in average twelve days after anthocyanins have reached a maximum.
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