Evaluation of the major compounds formed during grape must fermentation by yeast isolated from "Serra Gaúcha" (RS) region

Abstract

The objective of this work was to study the growth behavior, as well as, volatile compounds production during grape must fermentation by Kloeckera apiculata and Saccharomyces cerevisiae. The concentrations of the major volatile compounds during the fermentation were dependent of the temperature of the fermentation. In fermentation at 20°C, the concentration of the dry weight biomass and volatile compounds were greater than that ones at 15°C. The Kloeckera apiculata produced high concentrations of the ethyl acetate (197.0mg/L - 310.0mg/L) and isoamyl acetate (19.3mg/L - 31.3mg/L), esters of great sensory importance. However, the ethanol concentration obtained was lower, about 6.3g/L - 24.0g/L, than that one obtained with fermentation by Saccharomyces cerevisiae (27.3g/L - 34.0g/L).

fermentation; wine; aroma production; isolated; Kloeckera apiculata; Saccharomyces cerevisiae