Influence of grape maturity and prefermentative cluster treatment of the Grenache cultivar on wine composition and quality
- Olga Pascual 1
- Jeanette Ortiz 1
- Maruxa Roel 1
- Nikolaos Kountoudakis 1
- Mariona Gil 1
- Sergio Gómez Alonso 2
- Esteban García Romero 3
- Joan-Miquel Canals Bosch 1
- Isidro Hermosín Gutiérrez 2
- Fernando Zamora Marín 1
- 1 Departament de Bioquímica i Biotecnologia, Universitat Rovira i Virgili
- 2 Instituto Regional de Investigación Científica Aplicada
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Instituto de la Vid y el Vino de Castilla La Mancha
info
Instituto de la Vid y el Vino de Castilla La Mancha
Ciudad Real, España
ISSN: 1151-0285
Año de publicación: 2016
Volumen: 50
Número: 4
Páginas: 169-181
Tipo: Artículo
Otras publicaciones en: OENO ONE: Journal international des sciences de la vigne et du vin = International journal of vine and wine sciences
Resumen
This work studied how different grape maturity levels and cluster treatments affect the color and phenolic composition of Grenache wines. Specifically, five treatments were undertaken at a microvinification scale for three maturity levels : Control (destemmed and crushed grapes), Whole Berry, Whole Cluster, Crushed Cluster and Submerged Cap. The first three treatments were also reproduced with large-scale wine fermentation in oak barrels but only with well-ripened grapes. The results indicated that the total polyphenol index (TPI), anthocyanin and proanthocyanidin concentrations, as well as the mean degree of polymerization were higher in all the treatments when the grapes were riper. Submerged Cap generated maximum color and polyphenolic extraction at the three maturity levels. Whole Berry wines were the most similar to the controls. The presence of stems (Crushed Cluster and Whole Cluster treatments) produced wines with a significantly higher pH at all maturity levels and with lower color intensity when the grapes were less ripe. The presence of stems also significantly increased the TPI in almost all cases.