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High Saccharification, Low Lignin, and High Sustainability Potential Make Duckweeds Adequate as Bioenergy Feedstocks

Abstract

Duckweeds are the smallest free-floating aquatic monocots. They have a unique cell wall containing pectin polymers named apiogalacturonan and xylogalacturonan. Knowing that the cell wall composition is essential for duckweeds as a bioenergy feedstock, notably ethanol production, this work reports the five duckweed species’ (Spirodela polyrhiza, Landoltia punctata, Lemna gibba, Wolffiella caudata, and Wolffia borealis) composition and saccharification potential. Nonstructural carbohydrates were, on average, 42% of the dry weight. The cell wall comprises 20.1% pectin and glucomannan, 35.2% hemicelluloses, 30% cellulose, and 5% lignin, and the fermentable sugars in duckweed walls are glucose, galactose, and xylose. Together, these monosaccharides constitute 51.4% of the cell wall. Duckweeds displayed low recalcitrance to hydrolysis, probably due to the low lignin and cellulose contents. Furthermore, the saccharification of the duckweeds was higher than sugarcane, a primary bioethanol feedstock. Results indicate that duckweed biomass displays a high potential as a feedstock for bioethanol production.

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Data Availability

Not applicable.

Abbreviations

4M NaOH:

sodium hydroxide four molar

AIR:

alcohol insoluble residue

AmnOx:

ammonium oxalate

H:

hour

HPAEC-PAD:

high-performance anion-exchange chromatography with pulsed amperometric detection

L. gibba :

Lemna gibba stream DWC128

L. punctata :

Landoltia punctata stream 7624

MBTH:

3-methyl-2-benzothiazolinone hydrazone

Min:

minutes

RDSC:

Rutgers Duckweed Stock Corporation

S. polyrhiza :

Spirodela polyrhiza stream 9509

TFA:

trifluoroacetic acid

W. borealis :

Wolffia borealis stream 9144

W. caudata :

Wolffiella caudata stream 9139

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Acknowledgments

The authors gratefully acknowledge Dr. Eny Iochevet Segal Floh for allowing the use of her lab’s facility to cultivate the plants.

Funding

This work was supported by the Instituto Nacional de Ciência e Tecnologia do Bioetanol -INCT do Bioetanol (FAPESP/CNPq). DP (CAPES, 88882.377113/2019-1). AG (FAPESP 2019/13936-0). The support by a travel grant to EL by the US Fullbright-Brazil Scholar Mobility Program (2014) to travel to the laboratory of MB to jump-start this Project in 2014-2015 is gratefully acknowledged.

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MB, DP, AG, and EL planned the work; DP performed the experiments; DP and AG analyzed the data; DP, AG, and MB wrote the manuscript.

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Correspondence to Marcos S. Buckeridge.

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Supplementary Information

Supplemental Table 1.
figure4

The yield of cell wall fractionation process of Spirodela polyrhiza, Landoltia punctata, Lemna gibba, Wolffiella caudata, and Wolffia borealis concerning initial dry biomass. Values are the average percentage (%) ± standard errors (n=5). Significant differences are shown in bold with distinct letters (p<0.05). The nonstructural carbohydrates represent the biomass extracted with ethanol 80% plus the starch content. AmnOX stands for ammonium oxalate. The recovered cell wall represents the sum of the fractions AmnOx, 4 M NaOH, and residue, while the lost material represents the biomass lost during the fractionation. (PNG 532 kb)

Supplemental Table 2.
figure5

The percentage yield of cell wall fractionation process of Spirodela polyrhiza, Landoltia punctata, Lemna gibba, Wolffiella caudata, and Wolffia borealis concerning initial dry biomass. Values are percentage (%) from data of Table 1. L represented the Lemnoideae family and W Wolffioideae family. The nonstructural carbohydrates represent the biomass extracted with ethanol 80% plus the starch content. AmnOX stands for ammonium oxalate. The recovered cell wall represents the sum of the fractions AmnOx, 4 M NaOH, and residue, while the lost material represented the biomass lost during the fractionation (PNG 1660 kb)

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Pagliuso, D., Grandis, A., Lam, E. et al. High Saccharification, Low Lignin, and High Sustainability Potential Make Duckweeds Adequate as Bioenergy Feedstocks. Bioenerg. Res. (2020). https://doi.org/10.1007/s12155-020-10211-x

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Keywords

  • Cell wall
  • Polysaccharides
  • Ethanol
  • Fermentable sugars