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Table 3 Comparisons of fermentation performance among pretreatments with and without pH profiling.

From: High titer and yield ethanol production from undetoxified whole slurry of Douglas-fir forest residue using pH profiling in SPORL

  Control ( t i = 0) pH profiling ( t i = 25 min) pH profiling ( t i = 45 min)
Average fermentation performance measure (g/L/h)
Glucose consumption (72 h) −0.54 ± 0.06 −0.70 ± 0.07 −0.64 ± 0.05
Ethanol productivity (72 h) 0.42 ± 0.03 0.50 ± 0.02 0.51 ± 0.02
HMF metabolization (24 h) −0.05 ± 0.002 −0.03 ± 0.002 −0.02 ± 0.006
Maximal ethanol production
Terminal ethanol concentration (g/L) 38.6 ± 7.5 48.9 ± 1.4 45.9 ± 4.6
Ethanol yield (g g/sugar)a 0.390 ± 0.076 0.494 ± 0.014 0.460 ± 0.046
Ethanol yield (L/tonne wood)b 215 ± 42 297 ± 9 259 ± 26
Ethanol yield (% theoretical)c 52.8 ± 10.3 73.1 ± 2.1 63.7 ± 6.4
  1. aBased on the total of glucan, mannan, and xylan in the pretreated-solids and glucose, mannose, and xylose in the pretreatment spent liquor.
  2. bCalculated from measured amount of ethanol yield from the amount of pretreated whole slurry used in fermentation and the yield of whole slurry from pretreatment.
  3. cTheoretical yield (406 L tonne wood−1) based on total glucan, mannan, and xylan in the untreated forest residue of FS10.