ABSTRACT Fumaric acid is an additive allowed by the Codex Alimentarius and under evaluation by the International Organisation of Vine and Wine (OIV) that can be used for wine acidification but also to inhibit malolactic fermentation (MLF). The use of 300–900 mg/L of fumaric acid can inhibit MLF in red wines decreasing pH by 0.2 units or more depending on the buffer capacity. When MLF was running with populations of either 7 or 8 log CFU/mL strain alpha (Oenococcus oeni) the application of 600 mg/L of fumaric acid stopped the process for more than 50 days and cells were undetected in specific media. In triangular tastings, fumaric acid was not detected at 300–600 mg/L (p < .05). In subsequent preference tests, some tasters perceived more acidity and body. Fumaric acid is a useful technological additive to improve wine microbiological stability and freshness, also allowing reduction of...

RESUMEN El objetivo de este trabajo fue evaluar el efecto de diferentes inhibidores metabólicos sobre la fermentación alcohólica por dos cepas de Saccharomyces cerevisiae: 7VA y AWRI796. Estos inhibidores se producen durante la hidrólisis de materiales lignocelulósicos para la producción de bioetanol. La levadura 7VA mostró una alta tolerancia a estos inhibidores, sin afectar su producción de etanol. Además, se observaron efectos sobre la producción de glicerina y acetaldehído con o-vainillina y ácido trans-cinámico.

ABSTRACT The aim of this study was to evaluate the bioconversion of metabolic inhibitors (furfural, o-vanillin, transcinnamic acid and copper) during alcoholic fermentation by Saccharomyces cerevisiae, and its effect on secondary metabolites production. The tested yeast shows a good activity to convert furfural and o-vanillin into their derivatives furfuryl alcohol and ovanillyl alcohol, respectively, both detected in the respective mediums at final of fermentative process. Also, the production of higher alcohols was affected in the presence of o-vainillin and trans-cinnamic acid, and to a lesser extent of copper, with a marked effect obtained by discriminant analysis.