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Name of the crops | Major investigation | Major achievements | Reference |
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Sugarcane (Saccharum officinarum) | Juices were studied (i) without adding supplement, (ii) with addition of 0.5% yeast extract, and (iii) with addition of yeast extract, thiamine, and micronutrients | The highest ethanol concentration (39.4–42.1 g/L) was found in (iii), while the lowest was 11.0 g/L and found in (i) | [61] |
Enrichment technique was applied to isolate a thermotolerant yeast from cane juice for ethanol production at elevated temperature | Isolation and selection of thermotolerant yeast strain that produced high concentrations of ethanol at both 40 and 45°C from the juice | [59] |
Juices were supplemented and cells were adapted to galactose medium | Higher (30.0%) ethanol was found with adapted cells than nonadapted cells | [26] |
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Sugar beet (Beta vulgaris) | Juices were ultrafiltered and were supplemented with mineral salt | Ethanol concentration was found to be 85.0–87.0 g/L | [30] |
Flocculating and nonflocculating yeasts along with Z. mobilis were used through immobilization on loofa sponge | The highest ethanol yield (0.44 g/g) with the lowest productivity (0.08 g/h/L) was found by Z. mobilis | [3] |
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Sweet sorghum (Sorghum bicolor) | Five different genetic varieties (Keller, BJ 248, SSV84, Wray, and NSSH 104) were investigated for ethanol production | Keller variety produced the highest ethanol (9.0%, w/v) | [118] |
Impact of storage on sugar content loss of juice was studied | Up to 20.0% free sugars lost in 3 days at ambient temperature | [119] |
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Watermelon (Citrullus lanatus) | Juice was used as diluent, additive, and nitrogen source for processed sugar or molasses fermentation | As much as 25.0% w/v sugar was fermented at pH 3.0 (ethanol yield was 0.41–0.46 g/g) or up to 35.0% w/v sugar at pH 5.0 with an ethanol yield of 0.36–0.41 g/g | [120] |
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Dates (Phoenix dactylifera) | Juices were extracted from 3 genetic varieties of dates (Kunta, Bouhatem, and Eguoua) and fermentation was studied at 30°C and natural pH | All varieties produced ethanol with a maximum concentration of 25.0%, v/v | [111] |
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