Search results
Results from the WOW.Com Content Network
Cabernet Sauvignon musts interact with the skins during fermentation to add color, tannins and flavor to the wine. Most red wine grapes have their color concentrated in the skin, while the juice is much lighter in color. The duration of contact between the crushed grape skins and their juice impacts the final color and flavor profile.
Recently, several vintners have utilized native yeast fermentations. Skin-fermented orange wines and effervescent pétillant naturel wines (i.e., pét-nats) have popped up from producers across ...
The finest surface filtration, microfiltration, can sterilize the wine by trapping all yeast and, optionally, bacteria, and so is often done immediately prior to bottling. An absolute rated filter of 0.45 μm is generally considered to result in a microbially stable wine and is accomplished by the use of membrane cartridges, most commonly ...
The primary role of yeast is to convert the sugars present (namely glucose) in the grape must into alcohol.The yeast accomplishes this by utilizing glucose through a series of metabolic pathways that, in the presence of oxygen, produces not only large amounts of energy for the cell but also many different intermediates that the cell needs to function.
The natural occurrence of fermentation means it was probably first observed long ago by humans. [3] The earliest uses of the word "fermentation" in relation to winemaking was in reference to the apparent "boiling" within the must that came from the anaerobic reaction of the yeast to the sugars in the grape juice and the release of carbon dioxide.
About 90 wine growers and wineries make up the AVA, says Keikilani McKay, executive director for Wines of the Santa Cruz Mountains. (In comparison, Paso Robles has 450.) These are spread over 100 ...
Yeast need a reliable source of nitrogen in forms that they can assimilate in order to successfully complete fermentation. Yeast assimilable nitrogen or YAN is the combination of free amino nitrogen (FAN), ammonia (NH 3) and ammonium (NH 4 +) that is available for a yeast, e.g. the wine yeast Saccharomyces cerevisiae, to use during fermentation.
Malic and tartaric acid are the primary acids in wine grapes. The acids in wine are an important component in both winemaking and the finished product of wine. They are present in both grapes and wine, having direct influences on the color, balance and taste of the wine as well as the growth and vitality of yeast during fermentation and protecting the wine from bacteria.