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Table 5 Fermentation profile of selected glucose fermenting yeast isolates with acid- and alkali-pretreated rice straw enzymatic hydrolysates at 40 °C in 24 h

From: Evaluation of divergent yeast genera for fermentation-associated stresses and identification of a robust sugarcane distillery waste isolate Saccharomyces cerevisiae NGY10 for lignocellulosic ethanol production in SHF and SSF

S. no. Yeast strains Acid pre-treated rice straw enzymatic hydrolysate (APRSEH-1)b Alkali pre-treated rice straw enzymatic hydrolysate (APRSEH-2)c
Ethanol concentration (g/l) Ethanol yield (g/g) Ethanol Productivity (g/l//h) Ethanol efficiency (%) Glycerol concentration (g/l) Acetic acid concentration (g/l) Ethanol concentration (g/l) Ethanol yield (g/g) Ethanol productivity (g/l/h) Ethanol efficiency (%) Glycerol concentration (g/l) Acetic acid concentration (g/l)
1. Angel yeast 11.79 ± 0.08a 0.451 0.491 88.258 0.47 ± 0.03 0.52 ± 0.02 7.02 ± 0.02 0.456 0.293 89.24 0.46 ± 0.002 0.73 ± 0.02
2. S. cerevisiae CEN-PK-122 11.65 ± 0.21 0.441 0.485 86.423 1.38 ± 0.07 0.78 ± 0.03 6.95 ± 0.07 0.41 0.289 80.23 1.56 ± 0.06 0.79 ± 0.03
3. S. cerevisiae NGY1 11.75 ± 0.13 0.445 0.489 87.165 0.6 ± 0.02 0.54 ± 0.02 7.09 ± 0.09 0.454 0.295 88.85 0.39 ± 0.012 0.24 ± 0.01
4. S. cerevisiae NGY10 12.25 ± 0.09* 0.474 0.51 92.812 0.54 ± 0.02 0.47 ± 0.011 7.18 ± 0.04* 0.468 0.298 91.58 0.33 ± 0.005 0.18 ± 0.002
5. K. marxianus NCIM 3465 10.89 ± 0.16 0.412 0.453 80.785 0.85 ± 0.04 0.66 ± 0.02 6.19 ± 0.03 0.361 0.257 70.64 0.64 ± 0.021 0.36 ± 0.002
6. K. marxianus NGY8 11.55 ± 0.08 0.437 0.481 85.681 0.37 ± 0.01 1.87 ± 0.07 6.98 ± 0.07 0.41 0.29 80.23 0.16 ± 0.003 1.57 ± 0.008
7. C. glabrata CBS138 10.17 ± 0.07 0.419 0.423 82.003 0.28 ± 0.03 0.74 ± 0.032 5.67 ± 0.13 0.331 0.236 64.77 0.07 ± 0.002 0.45 ± 0.01
8. C. glabrata NGY7 10.92 ± 0.13 0.436 0.455 85.513 0.34 ± 0.02 0.81 ± 0.03 7.02 ± 0.06 0.43 0.292 84.14 0.13 ± 0.003 0.52 ± 0.002
9. P. kudriavzevii NGY12 9.45 ± 0.16 0.425 0.393 83.264 0.34 ± 0.01 0.67 ± 0.03 6.95 ± 0.11 0.41 0.289 80.23 0.13 ± 0.001 0.39 ± 0.003
11. P. kudriavzevii NGY20 10.51 ± 0.17 0.456 0.437 89.346 0.34 ± 0.02 0.67 ± 0.033 5.71 ± 0.12 0.332 0.237 64.97 0.13 ± 0.001 0.38 ± 0.002
12. C. tropicalis NGY19 10.48 ± 0.11 0.464 0.436 90.988 0.47 ± 0.03 0.46 ± 0.021 4.98 ± 0.08 0.29 0.207 56.75 0.26 ± 0.011 0.04 ± 0.001
  1. aMean ± standard deviation for n = 3; Fermentation pH-5.4; Initial sugar = 26.38 g/l, inoculums 5.0% v/v ≈ 1.0 × 107 cells/ml, fermentation time 24 h
  2. bAPRSEH-1 consisted of sugar 33.76 g/l (glucose: 26.38 g/l and xylose: 7.38 g/l), furfural: 0.618 g/l, HMF: 0.748 g/l and acetic acid: 1.91 g/l
  3. cAPRSEH-2 consisted of sugar 22.78 g/l (glucose: 17.15 g/l and xylose: 5.63 g/l), furfural: 0.142 g/l, HMF:0.148 g/l and acetic acid:0.51 g/l
  4. * Statistical student t-test of isolate NGY10 with reference strains CEN-PK-122 and Angel yeast for glucose fermentation of APRSEH-1 and APRSEH-2 was performed, and show significance, i.e. p < 0.05