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L-Lactic acid concentration (a) and pH (b) of fermenting wort measured every 24 h during lactic acid fermentation (LAF) and in the beer; REF: reference sample (without supplementation); Mg.1, Mg.2: wort supplemented with magnesium at two different levels; Zn.1, Zn.2: wort supplemented with zinc at two different levels. Bars show the average of three replicates ± standard deviation. *, ** and *** indicate homogeneous groups (p < 0.05) within the samples analysed at a certain timepoint.
