Cited by 137Biofuel production and bioconversionIonic liquids properties and applicationsEnzyme Catalysis and Immobilization

Point by point analysis: how ionic liquid affects the enzymatic hydrolysis of native and modified cellulose

Engel, Philip, Mladenov, Radoslav, Wulfhorst, Helene, Jäger, Gernot, Spiess, Antje C.·2010·Green Chemistry

Abstract

New strategies are needed to efficiently convert non-food biomass to glucose as a platform chemical. One promising approach is to use ionic liquids to first dissolve lignocellulose. Yet, in the presence of such solvents, the enzymes that catalyze cellulose hydrolysis become compromised in their activity. However, this decreased cellulase activity has not been examined in detail. Thus, the aim of this study was to investigate how the ionic liquid precisely affects cellulase activity and stability with regard to different cellulose substrates. Hereby, four ionic liquids were screened to identify which one best minimized the loss of enzyme activity. Then, this best ionic liquid was tested on one insoluble and two soluble cellulose substrates. Subsequently, the relevant parameters of solution viscosity and ionic strength were evaluated with respect to enzyme activity and stability. Finally the residual ionic liquid concentration from the precipitation of α-cellulose was varied. The best ionic liquid was found to be 1,3-dimethylimidazolium dimethylphosphate with the highest retained activity of 30% on the α-cellulose substrate in the presence of 10% (v/v) ionic liquid. Most importantly, an increase in viscosity and ionic strength contributed to the decrease in enzyme activity which nonetheless retained their stability. The hydrolysis of precipitated α-cellulose from ionic liquid showed significant higher reaction rates but reduced sugar yields when residual ionic liquid was present. None the less, it should be possible to effectively produce glucose from precipitated cellulose without needing to wash off all residual ionic liquid when optimized cellulase mixtures are used.

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Crossref · 10.1039/c0gc00135j

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61 of 61 references verified0 citation errors · 0 not checkable

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  • Hardwoods and softwoods may require prohibitive quantities of energy to grind to fine powders.

    “In contrast, hardwoods and softwoods may require prohibitive quantities of energy to grind to fine powders.183,186”

    From Deconstruction of lignocellulosic biomass with ionic liquids (2013) · cites this paper as [183]

  • The larger the ratio between initial and final particle size, the more mechanical energy is required for the size reduction, all other conditions being equal.

    “However, the larger the ratio between initial and final particle size, the more mechanical energy is required for the size reduction, all other conditions being equal.183”

    From Deconstruction of lignocellulosic biomass with ionic liquids (2013) · cites this paper as [183]

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Authors
Engel, P., Mladenov, R., Wulfhorst, H., Jäger, G., & Spiess, A. C.
Affiliations
RWTH Aachen University (DE)
Corresponding author
Spiess, Antje C.
Venue
Green Chemistry
Published
2010
Volume
12
Issue
11
Pages
1959
ISSN
  • 1463-9262 (ISSN-L)
  • 1463-9270
OpenAlex
W2074255689
Cited by
137
References
61
Citations by year
2026: 1 · 2025: 2 · 2024: 3 · 2023: 3 · 2022: 5 · 2021: 8 · 2020: 2 · 2019: 15 · 2018: 10 · 2017: 12 · 2016: 11 · 2015: 11 · 2014: 18 · 2013: 13 · 2012: 14
FWCI
6.80
Type
journal article
Language
en
Open access
closed
Locations
  • Green Chemistry (publishedVersion)
  • RWTH Publications (RWTH Aachen) (submittedVersion)
Funders
Deutsche Forschungsgemeinschaft
Topics
  • Physical Sciences › Engineering › Biomedical Engineering › Biofuel production and bioconversion
  • Physical Sciences › Chemical Engineering › Catalysis › Ionic liquids properties and applications
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Enzyme Catalysis and Immobilization
Keywords
ionic liquids, enzymatic hydrolysis, cellulase activity, alpha-cellulose, solution viscosity, ionic strength, glucose production, non-food biomass, sugar yield

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