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Table 3 Effect of dilution rates on lactic acid production in CSFTR

From: Dynamic simulation of continuous mixed sugar fermentation with increasing cell retention time for lactic acid production using Enterococcus mundtii QU 25

  Db Xc Sdcel Sexyl X/C ratiof Sgla Shaa Yila Pjla
h−1 g L−1 g L−1 g L−1 g L−1 g L−1 g g−1 g L−1 h−1
C100X60a—CFSTR
 D1 0.05 1.03 ± 0.01 86.6 ± 4.1 44.8 ± 1.4 0.980 25.5 ± 0.3 0.381 ± 0.080 0.887 1.28
 D2 0.10 1.43 ± 0.01 82.5 ± 3.8 46.7 ± 2.2 0.671 24.1 ± 0.8 0 0.780 2.41
 D3 0.15 2.53 ± 0.03 79.0 ± 1.1 48.1 ± 0.8 0.508 27.9 ± 0.7 0.260 ± 0.039 0.844 4.18
 D4 0.20 2.57 ± 0.02 77.2 ± 3.7 50.3 ± 2.5 0.543 26.9 ± 1.2 0.201 ± 0.031 0.823 5.37
 D5 0.25 1.74 ± 0.05 83.4 ± 1.9 48.2 ± 1.7 0.575 20.8 ± 0.9 0.116 ± 0.023 0.730 5.21
C50X30a— CFSTR
 D1 0.05 1.06 ± 0.03 29.3 ± 0.4 20.9 ± 0.4 0.441 32.7 ± 0.5 0.559 ± 0.018 1.09 1.64
 D2 0.10 1.43 ± 0.05 28.1 ± 0.5 21.5 ± 0.5 0.412 27.1 ± 1.3 0.380 ± 0.043 0.881 2.71
 D3 0.15 1.52 ± 0.08 30.9 ± 1.2 20.7 ± 0.7 0.465 22.1 ± 1.5 0.276 ± 0.058 0.770 3.31
 D4 0.20 2.18 ± 0.16 31.3 ± 0.9 22.7 ± 0.2 0.461 22.9 ± 0.9 0.415 ± 0.011 0.871 4.57
 D5 0.25 2.42 ± 0.02 26.7 ± 0.4 22.9 ± 0.6 0.304 23.4 ± 0.5 0.651 ± 0.064 0.763 5.85
 D6 0.30 2.29 ± 0.08 29.5 ± 0.7 23.7 ± 0.1 0.303 21.7 ± 0.9 0.650 ± 0.031 0.798 6.52
 D7 0.35 2.16 ± 0.12 30.4 ± 0.5 23.9 ± 0.3 0.312 18.0 ± 0.7 0.570 ± 0.032 0.695 6.29
C50X30a— CF/CR
 D0 0.20 33.6 ± 1.9 0.32 ± 0.2 4.71 ± 0.9 0.521 65.2 ± 3.5 1.97 ± 0.21 0.854 13.03
  1. a Compositions of fed medium, i.e., C100X60, 100 g L−1 cellobiose and 60 g L−1 xylose; C50X30, 50 g L−1 cellobiose and 30 g L−1 xylose; b dilution rates; ccell concentration; deffluent cellobiose concentration; eeffluent xylose concentration; fratios of consumed xylose over consumed cellobiose; glactic acid concentration; hacetic acid concentration; iyields of lactic acid production; and jlactic acid productivity