Title page for ETD etd-03162005-163933


Type of Document Master's Thesis
Author Millard, Lindsay Theresa
Author's Email Address lmillard@vt.edu
URN etd-03162005-163933
Title Effect of Training Systems on Viognier (Vitis vinifera L.) Grape and Wine Glycosides and Volatile Compounds
Degree Master of Science
Department Food Science and Technology
Advisory Committee
Advisor Name Title
Zoecklein, Bruce W. Committee Chair
Duncan, Susan E. Committee Member
O'Keefe, Sean F. Committee Member
Keywords
  • Viognier
  • training system
  • glycosides
  • volatiles
  • aroma
Date of Defense 2005-03-02
Availability restricted
Abstract
Viognier (Vitis vinifera L.) grapes were grown in Northern Virginia for three seasons using three different training systems in a randomized complete block design consisting of Vertical Shoot Positioned (VSP), Smart Dyson (SD), and Geneva Double Curtain (GDC), and evaluated for the effects on grape and wine glycosides and volatile compounds. Fruit was harvested at the same Brix each season, and differences in berry weights were not observed. VSP-trained vines had the lowest crop load and lowest light levels in the fruit zone. Seventeen volatile compounds were analyzed using headspace solid-phase microextraction, GC-MS. Fruit showed differences in linalool, á-terpineol, â-damascenone, and n-hexanol concentrations among the training systems. Wines showed differences in both grape-derived and fermentation-derived volatiles. SD had the highest concentration for most of the free volatiles quantified in both the juice and wine. VSP had lower phenol-free wine glycosides all three seasons and lower phenol-free juice glycosides one season. Triangle difference sensory testing demonstrated differences between GDC and SD in wine aroma and flavor, and differences between VSP and SD in flavor, for two of three seasons.
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