Table 5 shows the effect of extrusion on fermentable sugar yields, ethanol yield and fermentation parameters of DCF after semi-simultaneous saccharification and fermentation. The data clearly show extruded DCF gave significantly (p < 0.05) higher ethanol yield. Ethanol yields (22.75e29.08 g L1) are comparable with previously published results (Saha et al., 1998). From the data presented in Table 5, it is evident that xylose fermentation is the main contribution for ethanol yield because xylose yield (168.96 mg/g) is much higher than glucose yield (2.17 mg/g). Moreover, incomplete fermentation of xylose has been found when hexose (glucose) dominates in the medium (Barbosa et al., 1992; Lawford and Rousseau, 1993). Efficient xylose fermenting micro- organisms have also been observed among bacteria, yeast and fungi (natural as well as recombinant) (Olsson and Hahn-Hagerdal, 1996). Hahn-Hagerdal et al. (1986)
Table 5 shows the effect of extrusion on fermentable sugar yields, ethanol yield and fermentation parameters of DCF after semi-simultaneous saccharification and fermentation. The data clearly show extruded DCF gave significantly (p < 0.05) higher ethanol yield. Ethanol yields (22.75e29.08 g L1) are comparable with previously published results (Saha et al., 1998). From the data presented in Table 5, it is evident that xylose fermentation is the main contribution for ethanol yield because xylose yield (168.96 mg/g) is much higher than glucose yield (2.17 mg/g). Moreover, incomplete fermentation of xylose has been found when hexose (glucose) dominates in the medium (Barbosa et al., 1992; Lawford and Rousseau, 1993). Efficient xylose fermenting micro- organisms have also been observed among bacteria, yeast and fungi (natural as well as recombinant) (Olsson and Hahn-Hagerdal, 1996). Hahn-Hagerdal et al. (1986)
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