Optical density and final concentrations of malic and lactic acids 5 days after inoculation of MLO media with 2×10⁷ cfu/mLO. oeni. A: culture media added with fumaric acid; B: culture media added with potassium metabisulfite. In both tests there is a control treatment without addition of inhibitors. Different letters in the same series indicate significant statistical differences (p < 0.05).