Skip to main content

Table 1 Fermentations summary by E. coli JH13 and JH15

From: Enhancement of D-lactic acid production from a mixed glucose and xylose substrate by the Escherichia coli strain JH15 devoid of the glucose effect

Strain Substrate (100 g L−1) Fermentation Time (h) Sugar consumption (g L−1 h−1)a Lactic acid production (g L−1 h−1)b
Glucose Xylose Total (glu + xyl) Titer (g L−1) Yield (%) Vol. productivity (g L−1 h−1)
Max Average Max Average Max Average Max Average
JH13 Glucose 28 5.88 3.36      85 90 5.44 3.04
Xylose 91    1.65 0.95    84 83 1.63 0.93
Glu + Xyl 114 3.42 2.08 0.6 0.39 n/ac 0.71 66 80 n/a3) 0.58
JH15 Glucose 36 2.88 2.69      88 91 3.75 2.44
Xylose 120    1.38 0.8    81 83 1.13 0.67
Glu + Xyl 96 1.89 1.28 0.95 0.52 2.2 1.04 83 83 2.53 0.86
  1. aThe maximum sugar consumption was calculated from the fastest 8 h, or longer, fermentation period. The average sugar consumption was calculated from the active fermentation period (0 h to the end of fermentation)
  2. bThe yield was calculated based on lactic acid produced over sugar metabolized. The maximum lactic acid productivity was calculated from the fastest 8 h, or longer, fermentation period. The average lactic acid productivity was calculated from the active production period (0 h to the end of fermentation)
  3. cn/a is not applicable (since glucose and xylose was used separately in JH13, the maximum total sugar consumption and maximum lactic acid productivity would be derived from glucose fermentation only)