Issue link: http://winesandvines.uberflip.com/i/107279
WINEMAKING 2 BARREL STEAMING MACHINE AUTOMATED STEAMING! ! W NE 2 & 4 Barrel Washing • 2 & 4 Barrel Steaming Barrel Processing Lines • 1/2 Ton Bin Washing Systems 35 lb. Picking Lug Washers • Custom Cellar Equipment 1650 Almar Parkway, Santa Rosa, CA 95403 P. 707-573-3150 F. 707-573-3140 www.tombeard.com E. jmendoza@tombeard.com 54 W in es & V i ne s F E B R UARY 20 13 Eucalyptus leaves 30 25 20 15 10 Grape leaf and stem 0 Control hand plucked M Fermalolac enta tic tion 5 Pres s The study consisted of a number of stages. In early investigations, wines were made from batches of grapes harvested at set distances from eucalyptus trees in single vineyards in Western Australia and Victoria. The results in the graph 1,8-Cineole Concentration (page 52) clearly show that the greatest amount of 1,8-cineole was found in wines made from grapes taken from rows closest to the eucalyptus trees. In Victoria, grapes harvested within 50 meters of eucalyptus trees produced wine with a 1,8-cineole concentration of 15.5μg/L, and grapes harvested from rows further away produced a wine with an extremely low 1,8-cineole level of just 0.1μg/L. In another investigation, wines from consecutive vintages were analyzed from the Coonawarra region in South Australia. The vineyard concerned was in close vicinity of well-established eucalyptus trees. In this case, the wines produced from this vineyard contained relatively high amounts of 1,8-cineole, at 47μg/L (2006 vintage) and 81.5μg/L (2007 vintage), and were considered by the winemaker to display an obvious "eucalypt" character. These lots were not sold commercially and may have been blended with other wine, which is a common practice to adjust and refine sensory attributes. These investigations supported the theory that the presence of 1,8-cineole was likely to be related to eucalyptus trees. Additional vineyard studies were still needed, however, to work out how the 35 Cru sh Cold soak Inno cula tion Solving the case Effect of Leaves and Stems Concentration of 1,8-cineole (μg/L) ethylene sheets) were also installed in a vineyard in 2008 and 2009 to measure airborne 1,8-cineole levels. The samples were supplied, collected and stored according to best practices and then subjected to analysis of 1,8-cineole levels using gas chromatography/mass spectrometry (GC/MS). compound was transferred from the trees to the vineyard and, ultimately, into wine. To find out, the AWRI turned its attention to the relationship between grape composition and proximity to eucalyptus trees; this included the analysis of grape berries, stems and leaves. The vineyard chosen for the study had eucalyptus trees close to vines with a history of producing wines with 1,8-cineole concentrations well above sensory threshold levels. Analyses showed that grape skins contained much higher concentrations of 1,8-cineole than grape pulp (see photo on