Abstract
In the traditional winemaking practices, the sulfur dioxide (SO2) has been used for its antimicrobial and antioxidant properties. However, in recent decades, increasing consumer demand for healthier, low-intervention, and additive-free wines has promoted researchers and producers to explore natural alternatives. Among these, non-Saccharomyces yeasts have been proposed as a sustainable substitute of SO2, addressing both: health and consumer concerns. This method consists of the early inoculation of must or grapes with selected yeast strains, such as Metschnikowia pulcherrima, which produces antimicrobial metabolites to protect the wine and enrich wine aromatic complexity. This study aimed to evaluate the effectiveness of a selected M. pulcherrima strain as a bio protection agent in wine production. Controlled fermentations were conducted in triplicate, comparing conventional sulfiting with bio protected must. The kinetic and microbial populations were monitored during the fermentation process, and the respective wines were analyzed for key quality parameters. The results demonstrated that M. pulcherrima effectively limited undesirable microflora and improved fermentation kinetic without compromising wine quality. These findings support the potential of Bioprotectionas a promising strategy for reducing SO2 in winemaking. This approach, previously unexplored in the Albanian wine industry, offers a pathway for producing organic, natural and sustainable wines, using native cultivars, while contributing to preservation of local biodiversity.
| Keywords: | Bioprotection non-Saccharomyces Yeasts Sulfite Reduction Natural Wine Biodiversity |