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Acetic acid concentration (a) after 72 h of lactic acid (LAF) and ethanol fermentation (beer), and succinic and malic acid (b) in 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 within the same compound (p < 0.05).
