Enzymatic saccharification of duckweed (Lemna minor) biomass without thermophysical pretreatment

X. Zhao, A. Elliston, S. R. A. Collins, G. K. Moates, M. J. Coleman, K. W. Waldron

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Duckweed is a rapidly replicating aquatic plant that has the potential to decontaminate effluent streams from food processing and also has a low-lignin content. Hence it could provide a more suitable source of cellulose for conversion to biofuels.

This paper reports that duckweed biomass has the potential to be enzymatically saccharified to produce glucose and other cell-wall-derived sugars which might be converted to ethanol by fermentation or exploited as industrial platform chemicals. The enzymatic digestibility has been studied on alcohol-extracted, water-insoluble preparations of duckweed cell walls. Within these, glucose accounts for w = 25.4% (dry wt), which has arisen from cellulose and non-cellulosic glucans including starch. Several commercial cell-wall degrading enzymes and cocktails have been evaluated. Saccharification can be achieved within about 8 h using commercial cellulase at 4.35 FPU g−1 substrate in conjunction with added beta-glucosidase at 100 U g−1 substrate. The potential for exploiting duckweed is discussed.

Original languageEnglish
Pages (from-to)354-361
Number of pages8
JournalBiomass and Bioenergy
Volume47
DOIs
Publication statusPublished - Dec 2012

Keywords

  • Duckweed
  • Lemna minor
  • Enzymes
  • Saccharification
  • Biomass sugar

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