Production of lactic acid and ethanol by Rhizopus oryzae integrated with cassava pulp hydrolysis
2010
E02425
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Title
Production of lactic acid and ethanol by Rhizopus oryzae integrated with cassava pulp hydrolysis
Publication Date
2010
Call Number
E02425
Summary
Cassava pulp was hydrolyzed with acids or enzymes. A high glucose concentration (>100 g/L) was obtained from the hydrolysis with 1 N HCl at 121 pC, 15 min or with cellulase and amylases. While a high glucose yield (>0.85 g/g dry pulp) was obtained from the hydrolysis with HCl, enzymatic hydrolysis yielded only 0.4 g glucose/g dry pulp. These hydrolysates were used as the carbon source in fermentation by Rhizopus oryzae NRRL395. R. oryzae could not grow in media containing the hydrolysates treated with 1.5 N HSO or 2 N HPO, but no significant growth inhibition was found with the hydrolysates from HCl (1 N) and enzyme treatments. Higher ethanol yield and productivity were observed from fermentation with the hydrolysates when compared with those from fermentation with glucose in which lactic acid was the main product. This was because the extra organic nitrogen in the hydrolysates promoted cell growth and ethanol production.
Journal Citation
v.33(3):407-416, BIOPROCESS AND BIOSYSTEMS ENGINEERING
Contact Information
harvest@worldveg.org
Record Appears in
Research > Published Articles