Ethanol production from candidate energy crops: Water hyacinth (Eichhornia crassipes) and water lettuce (Pistia stratiotes L.)

  • Mishima D
  • Kuniki M
  • Sei K
 et al. 
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Abstract

Fermentation modes and microorganisms related to two typical free-floating aquatic plants, water hyacinth and water lettuce, were investigated for their use in ethanol production. Except for arabinose, sugar contents in water lettuce resembled those in water hyacinth leaves. Water lettuce had slightly higher starch contents and lower contents of cellulose and hemicellulose. A traditional strain, Saccharomyces cerevisiae NBRC 2346, produced 14.4 and 14.9 g l-1ethanol, respectively, from water hyacinth and water lettuce. Moreover, a recombinant strain, Escherichia coli KO11, produced 16.9 and 16.2 g l-1ethanol in the simultaneous saccharification and fermentation mode (SSF), which was more effective than the separated hydrolysis and fermentation mode (SHF). The ethanol yield per unit biomass was comparable to those reported for other agricultural biomasses: 0.14-0.17 g g-dry-1for water hyacinth and 0.15-0.16 g g-dry-1for water lettuce. © 2007 Elsevier Ltd. All rights reserved.

Author-supplied keywords

  • Aquatic plant
  • Biomass
  • Ethanol
  • Water hyacinth (Eichhornia crassipes)
  • Water lettuce (Pistia stratiotes L.)

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