Ethanol production from hexose and pentose by Kluyveromyces marxianus
Kluyveromyces marxianus DL1 and Saccharomyces cerevisiae 6525 were compared by using hexose (glucose, mannose and galactose) and pentose (xylose and arabinose) as substrates. When hexoses were used as substrates, K. marxianus showed the characteristic of fast growth and higher ethanol yield. Under the condition of anaerobic and 20 g/L sugar concentration, the ethanol concentration of K. marxianus DL1 was 10% higher than that of S. cerevisiae 6525, and the biomass and the ethanol productivity of K. marxianus DL1 were 2 and 1?7 times to that of S. cerevisiae 6525? When pentoses were used as the substrate under the conditions of anaerobic and 20 g/L sugar concentration, S. cerevisiae 6525 could not use pentoses whereas K. marxianus DL1 could use xylose to produce ethanol and xylitol, and the concentration reached 7?68 g/L and 9?12 g/L, respectively. K. marxianus DL1 could also ferment arabinose to produce 6 g/L arabitol. K. marxianus DL1 is more suitable for cellulosic ethanol production than Saccharomyces cerevisiae.
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