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Table 2 Comparison of different processes using potato waste materials to produce ethanol

From: An environmentally friendly and productive process for bioethanol production from potato waste

Raw materials Substrate concentration (w/v) Pretreatment method Glucose concentration (g/L) Ethanol concentration (g/L) Glucan conversion (%) Glucose to ethanol conversion (%) Ethanol yield
(g/g, dry weight)
Reference
Sweet potato residues 36 % Enzymatic hydrolysisa 168.13 ± 2.62 79.00 ± 0.87 68.34 ± 1.07 67.16 ± 0.74 0.23 ± 0.00 This study
Sweet potato residues 36 % Enzymatic hydrolysisb 153.46 ± 2.01 73.37 ± 1.87 62.37 ± 0.82 62.37 ± 1.59 0.21 ± 0.01 This study
Potato pulp 30 % Hydrothermal pretreatment and enzymatic pretreatmentc 114 Less than 60 68 Less than 68 Less than 0.2 [48]
Potato peel waste 2 % Enzymatic hydrolysisd 18.48 ± 0.65 7.50 ± 0.28 [23]
Waste potato mash Physical methode Less than 80 35 [24]
Potato peel + substandard mash 1:1 Enzymatic hydrolysisf 48.6 ± 1.3 42.5 0.19 [57]
Potato tuber mash 1:1 Acid-catalysed hydrolysisg 100 32.9 [20]
Potato peel waste 4 % Acid-catalysed hydrolysish 18.15 6.97 [23]
Potato starch residue stream Acid-catalysed hydrolysisi 18.9 5.62 ± 0.21 [21]
  1. a4 FPU/g dry SPRs + 1000 PGU/g dry SPRs, 45 °C for 6 h, cellulase from T. reesei TX, pectinase was generously provided by Qingdao Vland Biotech Inc
  2. b6 FPU/g dry SPRs, 45 °C for 6 h, cellulase from T. reesei TX
  3. cHot water pretreatment, 121 °C for 20 min, 5 FPU/g dry weight, 50 °C for 48 h, enzyme from A. cellulolyticus
  4. d0.12 U/g dry weight at 85 °C for 1 h, enzyme from Termamyl 120 L, then 12 U/g dry weight at 44 °C for 2.5 h, enzyme from Viscozyme, and finally, 1 g Celluclast per g dry weight at 50 °C for 2 h
  5. eAgitation at 120 rpm for 3 h at a temperature chosen by the design based on a preliminary study
  6. fThe amount of enzyme, consisting of α-amylase + Pectinase + Enzyme complex, is 0.1 %. They were incubated at 50 °C for 21 h
  7. g60 min in 1 M HCl at 100 °C
  8. h0.5 M HCl, 121 °C for 15 min
  9. i60 min in 1 % H2SO4 at 100 °C