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. 2018 Nov 19;9:2763. doi: 10.3389/fmicb.2018.02763

FIGURE 8.

FIGURE 8

Production of (A) ethanol and methyl-1-butanol and (B) ethyl acetate, ethyl lactate, and acetoin during the 24-month lambic beer production processes carried out in two identical oak casks. Since no differences were found regarding substrates and metabolites for the different sampling heights (top, middle, and bottom of the fermenting wort and maturing beer in the casks), average concentrations are reported. In the case of ethanol, ethyl acetate and acetoin, the averages were taken of the concentrations measured in the fermenting wort and maturing beer at the top, middle, and bottom of the same casks during the same lambic beer production processes reported before (De Roos et al., 2018). Standard deviations represent technical replicates. Cask 1 (Inline graphic) and cask 2 (Inline graphic).