were similar, with the values of 74.88 and 78.26 g·L−1, respectively and the highest total sugar
remaining (128.17 g·L−1) was detected at 38 °C. Sugar consumption and ethanol production were
agreed with each other. Changes of the ethanol concentration at 30 and 35 °C were similar in the first
48 h, after that the value at 30 °C was continuously increased until 72 h. The highest ethanol
concentrations at 35 and 38 °C were observed at 48 h with the values of 79.25 and 57.34 g·L−1,
respectively (Table 4). These results demonstrated that higher fermentation temperature had an adverse
effect on the ethanol production. When compared between 30 and 35 °C, in the first 36 h, sugar
consumption and ethanol production were similar. After 36 h, the values at 30 °C were higher. This
might be due to significantly higher viable cell concentration remaining at 30 °C.
Table 4. Main fermentation parameters of batch ethanol production from the sweet
sorghum juice at different temperatures.