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Table 3 Summary of results after prefermentation of hydrolyzate liquor followed by fed-batch cofermentation of enzymatic hydrolyzate

From: Prefermentation improves ethanol yield in separate hydrolysis and cofermentation of steam-pretreated wheat straw

Fig. Description Residual sugars and end-products Xylose utilization Yields
Glucose Xylose Xylitol Ethanol   Ethanola Xylitolb
g·L−1 g·L−1 g·L−1 g·L−1 % g·g−1 % g·g−1
  S, Model 0.1 5.3 2.0 28.9 75.9 0.346 67.9 0.120
  M, Model 0.1 1.2 5.7 32.2 96.1 0.360 70.6 0.191
2a S, B, 2 0.3 6.4 2.3 37.0 70.6 0.381 74.8 0.135
2b S, FB, 2 32.5 17.5 0.6 16.0 ND 0.164 32.2 ND
3a M, B, 1 0.1 0.1 3.1 38.7 98.0 0.401 78.5 0.112
3b M, FB, 1 0.1 0.4 1.0 40.9 96.9 0.423 82.9 0.036
3c, 4b M, B, 2 0.1 1.6 3.2 38.5 92.4 0.398 78.1 0.123
4a M, B, 2 c 0.5 4.7 1.4 27.3 ND 0.287 56.2 ND
3d M, FB, 2 0.1 2.0 1.5 39.6 90.9 0.409 80.2 0.058
  1. S severe slurry; M mild slurry; B batch prefermentation; FB fed-batch prefermentation; 1 1 addition of enzymatic hydrolyzate; 2 2 additions of enzymatic hydrolyzate, ND not determined
  2. aEthanol yield based on total supplied glucose and xylose and related to the maximum theoretical yield (0.51 g·g−1)
  3. bXylitol yield based on total consumed xylose
  4. c12, M, B, 2 with insufficient prehydrolysis