Fig. 6From: Production of acetoin and its derivative tetramethylpyrazine from okara hydrolysate with Bacillus subtilisa Production of acetoin using okara enzymatic hydrolysate as carbon source in conjunction with different amounts of corn dry powder (CDP). Control: okara enzymatic hydrolysate as the carbon source, 15 g/L corn dry power. b Comparison of acetoin fermentation between okara hydrolysate (29 g/L reducing sugar) supplementation of 3 g/L urea and containing 3 g/L urea simulating okara hydrolysate sugar composition (29 g/L reducing sugar), supplemented with (2.5, 7.5, 15 g/L) corn dry powder and (2.5, 7.5, 15 g/L) yeast extract, respectively. Control: okara enzymatic hydrolysate as the carbon source, 3 g/L urea (*Significance code: p < 0.05, **Significance code: p < 0.01)Back to article page