Review Article
Bioethanol Production from Fermentable Sugar Juice
Table 4
Fermentation process employed in ethanol production from different feedstocks.
| Feedstock | Initial sugar (g/L) | Fermentation mode | Processing/techniques | Microorganisms | Temperature (°C) | pH | Agitation rate (rpm) | Time (h) | Ethanol concentration (g/L) | Productivity (g/L/h) | Ethanol yield (%) | Reference |
| Sugarcane juice | 200 | Batch | Juice was supplemented with sucrose | K. marxianus DMKU 3-1042 | 40 | 5.0 | 300 | 42–96 | 67.9 | 1.42 | 60.4 | [59] | 166 | Batch | Recycling of yeast | P. kudriavzevii | 40 | 5.5 | 150 | 24 | 71.9 | 4.00 | — | [26] | 173 | Repeated batch | Immobilization of cells on sugarcane pieces | S. cerevisiae | 30 | — | — | 32 | 89.73 | 2.48 | — | [56] | 220 | Batch | Coculture of immobilized cells on thin-shell silk cocoon | K. marxianus DMKU 3-1042 and S. cerevisiae M30 | 37–40 | 5.0 | 150 | 72 | 77.3–81.4 | 1.07–1.1 | 80.23–86.1 | [126] | 180 | Continuous | Immobilization of cells on chrysotile | Strains of Saccharomyces sp. | 30 | 5.0 | — | 117 | 13.3–19.4 | — | 80.4–97.3 | [127] | 200 | Continuous | Recycling of cells was done in a tower reactor | S. cerevisiae IR-2 | 30 | — | 130 | 72 | 90 | 18 | 99 | [128] |
| Sweet sorghum juice | 190 | Fed-batch | Juice was supplemented with 0.5% ammonium sulphate | S. cerevisiae TISTR 5048 | 30 | — | Static | 108 | 116.62–120.28 | 1.08–1.11 | 94.12–96.8 | [44] | 240–320 | Batch | Juice was adjusted with sucrose or molasses for very high gravity fermentation | S. cerevisiae NP01 | 30 | 4.9 | Static | 40–72 | 120.68 | 2.01 | 99.8 | [96] | — | Batch | Immobilization on Ca-alginate | S. cerevisiae CICC 1308 | 37 | 5.0 | 200 | 11 | — | — | 93.24 | [104] |
| Watermelon juice | 183–409 | Batch | Juice was supplemented with molasses | Dried yeast | 32 | 3.1–5.0 | 100 | 36–160 | 83.2 | — | — | [120] |
| Sugar beet juice | 200 | Batch | Immobilization of cells on loofa sponge | S. cerevisiae, Candida brassicae, and Z. mobilis | 30 | 6.5 | 200 | — | — | 0.08–0.53 | 72.4–86.1 | [3] |
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