ISHS Acta Horticulturae 931: XXVIII International Horticultural Congress on Science and Horticulture for People (IHC2010): International Symposium on the Effect of Climate Change on Production and Quality of Grapevines and their Products
EFFECT OF AN OAK EXTRACT APPLIED TO 'VERDEJO' VINEYARD ON GRAPE COMPOSITION |
| Authors: | A.M. Martínez-Gil, T. Garde-Cerdán, L. Martínez, G.L. Alonso, M. Rosario Salinas |
| Keywords: | oak extract, quality grape, oenological parameters, nitrogen compounds |
| DOI: | 10.17660/ActaHortic.2012.931.38 |
| Abstract:
The aim of this work was to study the influence of a commercial oak extract on the oenological parameters and nitrogen composition of ‘Verdejo’ grapes. The aqueous extract solution was applied at veraison by spraying over grapevines according to four different treatments: 25%(1), 25%(4), 100% and control. Glucose, fructose, tartaric acid, amino acids and ammonium were analysed by HPLC and the other oenological parameters were analysed according to the official methods. The results obtained showed that the different treatments did not affect the titratable acidity and pH of the grapes. The 25%(4) treatment affected the other oenological parameters (weight of the 100 berries, °Baumé, probable alcohol) more than 25%(1) and 100% treatments. In addition, grapes from 25%(4) treatment presented the lowest content in tartaric acid, glucose and fructose; moreover, all treatments decreased grape nitrogen content, especially the 25%(1). Consequently, the extract application to the grapevine affect the grape composition; therefore it will affect the final wine quality, as nitrogen compounds are precursors of wine aroma compounds. | |
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