The Impact of GoLo Technology on the Quality Properties of Dealcoholised Wines

Winemakers are increasingly adopting partial or total dealcoholisation of wines and alcoholic beverages in response to market trends and the impact of climate change on wine alcohol content. In this study, the patented very low-temperature vacuum wine distillation technology known as GoLo was used to dealcoholise various types of red, white, and rosé wines from different Spanish designations of origin (DOs) in order to examine changes in oenological parameters as pH, sulphites, total acidity, volatile acidity, and sugars and the perceptible differences among a set of wines through sensory analysis and the chemical analysis related, such as turbidity, total phenolic content, and a profile of volatile compounds. The results indicate that there is an increase in the overall polyphenol content in the range of 8 to 12%, turbidity increased in the range of 13 to 70%, and sulphites decreasing in the range of 20 to 40%. The aroma profile also reveals that the most volatile and less soluble compounds—such as esters (reduction between 60% and 96%), terpenes (reduction between 45% and 80%), and aldehydes (reduction between 86% and 95%)—are lost in varying percentages during the dealcoholisation process, depending on the type of wine. Meanwhile, other more soluble compounds like phenols and acids undergo transformations during GoLo’s dealcoholisation process, leading to an increase in their concentrations up to more than 90% in the case of phenols in white wines or 35% for acids in red wines.