The objective of this work is to characterize the different fractions obtained, based on their malic, tartaric and total acidity. Twenty fractions of must were discriminated in order during the pressing for further physical-chemical analysis by Fourier Transform (FTIR).
The use of clonal selections in viticulture allows having vineyards with more defined and uniform characteristics. Different clonal selections of a same cultivar can have different productive and quality based characteristics, which are dependent on environmental factors. The objective of this study was to characterize three grapevine clonal selections ENTAV-INRA (169, 191, and 337) and a massal selection of Cabernet Sauvignon, submitted to two yield range management by a cluster thinning treatment.
During ageing, different chemical reactions occur affecting the stability of wine. These reactions depend on the temperature, the conservation time, etc. Also, these reactions are affected by dissolved oxygen (OD) and headspace oxygen (OHS) which are related to the permeability of different closures types.
The objective of this work was evaluate different fractions of must obtained along the vertical pressing, aiming to study important variables on quality of white wines. Thus, twenty portions of must were obtained for subsequent physico-chemical analyzes of total acidity, pH and tartaric acid by Fourier Transform Infrared Spectrometry (FTIR).
In the São Francisco Valley, Northeast of Brazil, tropical wines have been produced thirty years ago. Vines can produce twice a year and wine stability can change according to the harvest date. Normally wines elaborated from grapes harvested between November-December have a fast evolution, while wines from grapes harvested between June-July can have greater stability.
Wine industry is an important economic activity in the World, generating significant quantities of residues, mostly known as grape pomace. This material is rich in many nutrients, as fiber, minerals and antioxidants substances, such as phenolic compounds. These nutraceutical properties of grape pomace could be harnessed for human or animal consumption.
The use of non-traditional grape varieties for elaboration of sparkling wines is a challenge for the winemaking industry. The Goethe variety stands out as being a typical cultivar of the Urussanga Region in the south of Santa Catarina State, Brazil, where most of its production is directed to the elaboration of still wines.
Among the compounds contributing to the grape and wine qualities, phenolics play an important role. Therefore, the objective of this study was to determine the phenolic compounds of skins and pulps of white and red grapes at harvest, destined to traditional sparkling wines, from two winegrowing regions producing tropical wines in the Northeast of Brazil.
The ripening level of the grape is one of the most important factors in the quality of its derivatives, because of the complex phenomena inherently related to the varieties and environmental conditions. The objective of the present study was to monitor the phenological development of the Chardonnay variety and to evaluate the influence of the different ripening points on the production of juices.
The Torrontés Riojano is an emblematic variety in the Calchaquí Salteño Valley. The obtaining of selected native yeasts is a tool of differentiation of the wines, highlighting unique characteristics of the terroir. Native yeasts were isolated from spontaneous fermentations of Torrontés grapes harvested in nine zones of the Valley. We obtained 45 isolates.
However, the increase of sugar concentration in the grapes causes a decrease of desired organic acids which are positive for the production of sparkling wines. The aim of this study was to identify the optimal harvest period of 'Chardonnay' intended to sparkling wine making in Dom Pedrito, Campanha Gaúcha.
Rosciola is an antique red grape variety in the Lazio region (Italy) in the area between the Simbruini mountains and the high valley of Aniene. The name “Rosciola” is probably due to the light red color that the skin berries have to maturity. The oenological aspect was observed and evaluated over various vintages (Ciolfi G. et al., 2009).
Rosé sparkling wines require special elaboration methods that ensure their quality and color stability during aging in bottle. The objective of this work was to evaluate the effect of the addition of different concentrations of gum arabic and tannin in Brazilian rosé sparkling wines elaborated by the Traditional method (cv. Cabernet Sauvignon) and their impact on the phenolic composition during aging in bottle.