fermentation Review Commercially Available Non-Saccharomyces Yeasts for Winemaking: Current Market, Advantages over Saccharomyces, Biocompatibility, and Safety Ricardo Vejarano 1,* and Angie Gil-Calderón 2 1 Dirección de Investigación y Desarrollo, Universidad Privada del Norte (UPN), Trujillo 13001, Peru 2 Ingeniería Agroindustrial, Universidad Privada del Norte (UPN), Trujillo 13001, Peru;
[email protected] * Correspondence:
[email protected] Abstract: About 42 commercial products based on non-Saccharomyces yeasts are estimated as avail- able on the market, being mostly pure cultures (79%), with a predominance of Torulaspora delbrueckii, Lachancea thermotolerans, and Metschnikowia pulcherrima. The others are multi-starter consortia that include non-Saccharomyces/Saccharomyces mixtures or only non-Saccharomyces species. Several com- mercial yeasts have shown adequate biocompatibility with S. cerevisiae in mixed fermentations, allowing an increased contribution of metabolites of oenological interest, such as glycerol, esters, higher alcohols, acids, thiols, and terpenes, among others, in addition to a lower production of acetic acid, volatile phenols, biogenic amines, or urea. Multi-starter inoculations are also reviewed here, which show adequate biocompatibility and synergy between species. In certain cases, the aromatic profile of wines based on grape varieties considered neutral is improved. In addition, several yeasts show the capacity as biocontrollers against contaminating microorganisms. The studies conducted to Citation: Vejarano, R.; Gil-Calderón, A. Commercially date demonstrate the potential of these yeasts to improve the properties of wine as an alternative and Available Non-Saccharomyces Yeasts complement to the traditional S. cerevisiae. for Winemaking: Current Market, Advantages over Saccharomyces, Keywords: commercial non-Saccharomyces yeasts; winemaking; biocompatibility; wine quality Biocompatibility, and Safety.