Fig. 4From: Production of acetoin and its derivative tetramethylpyrazine from okara hydrolysate with Bacillus subtilisRecombinant strain fermented acetoin under microaerobic conditions in M9 mixed sugar medium (10 g/L glucose + 5 g/L galactose). a BS01-pMA5; b BS02; c BS03; d BS04Back to article page