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Table 2 Summary of fermentation parameters of steam-exploded and AFEX™-treated bagasse and cane leaf matter

From: Ethanol production potential from AFEX™ and steam-exploded sugarcane residues for sugarcane biorefineries

Parameter AFEX™—bagasse StEx—bagasse—unwashed solids StEx—bagasse—washed solids StEx—bagasse—whole slurry StEx—bagasse—C5-liquor AFEX™—CLM StEx—CLM—unwashed solids StEx—CLM—washed solids StEx—CLM—whole slurry StEx—CLM—C5-liquor
Initial glucose conc. (g L−1) 59.03 83.89 97.56 69.67 2.89 58.45 96.27 101.49 68.30 2.10
Initial xylose conc. (g L−1) 37.01 11.22 5.60 26.09 21.19 35.15 12.38 7.70 27.95 26.18
Glucose consumption (%) 100 100 100 98 100 100 100 100 99 100
Xylose consumption (%) 96 90 95 37 29 95 97 96 41 61
µmax (h−1)a 0.31 0.24 0.27 0.05 0.013 0.3 0.25 0.32 0.055 0.015
Y x/s (g CDW/g sugar)b 0.05 0.04 0.04 0.03 0.02 0.05 0.04 0.04 0.03 0.01
Metabolic yield (%)c 92 91 89 87 69 89 89 90 87 71
Yp/s (g EtOH/g sugar)d 0.46 0.45 0.45 0.36 0.13 0.44 0.45 0.46 0.36 0.23
EtOH conc. (g L−1) 44.17 43.48 46.75 34.62 3.18 41.70 49.24 50.21 35.07 6.48
EtOH yield (kg/100 kg DM)e 25.60 16.54 16.84 16.23 1.69 24.90 15.98 16.58 16.67 3.75
  1. All hydrolysates were supplemented with 0.25% (w/w) corn steep liquor prior to fermentation. The C5-liquor/s were acid hydrolysed to convert oligosaccharides to their monomeric counterparts prior to fermentation
  2. Data represent the averages of independent duplicate fermentation cultivations. All standard errors were less than 5%
  3. aMaximum specific growth rate: maximum growth rate calculated in the exponential growth phase
  4. bCell biomass yield: gram of cell dry weight per gram of sugar (glucose + xylose) consumed during fermentation
  5. cMetabolic yield: gram of ethanol produced per gram of sugar (glucose + xylose) consumed during fermentation
  6. dEthanol yield: gram ethanol produced per gram of sugar at the beginning of fermentation
  7. eEthanol yield per 100 kg of untreated dry material