Solution-state nuclear magnetic resonance spectroscopy of crystalline cellulosic materials using a direct dissolution ionic liquid electrolyte

dc.contributorAalto Universityen
dc.contributor.authorFliri, Lukasen_US
dc.contributor.authorHeise, Katjaen_US
dc.contributor.authorKoso, Tetyanaen_US
dc.contributor.authorTodorov, Aleksandar R.en_US
dc.contributor.authordel Cerro, Daniel Ricoen_US
dc.contributor.authorHietala, Samien_US
dc.contributor.authorFiskari, Juhaen_US
dc.contributor.authorKilpeläinen, Ilkkaen_US
dc.contributor.authorHummel, Michaelen_US
dc.contributor.authorKing, Alistair W.T.en_US
dc.contributor.departmentDepartment of Bioproducts and Biosystemsen
dc.contributor.groupauthorBiopolymer Chemistry and Engineeringen
dc.contributor.groupauthorMaterials Chemistry of Celluloseen
dc.contributor.organizationUniversity of Helsinkien_US
dc.contributor.organizationMid Sweden Universityen_US
dc.descriptionFunding Information: The authors want to acknowledge the fundamental contributions of A. Holding, V. Mäkelä and S. Heikkinen in the early stages of the development of this method. A.W.T.K. gratefully acknowledges funding by the Academy of Finland (project no. 311255, ‘WTF-Click-Nano’). K.H. gratefully acknowledges the postdoctoral grant received from the Academy of Finland (project no. 333905). Publisher Copyright: © 2023, Springer Nature Limited.
dc.description.abstractOwing to its high sustainable production capacity, cellulose represents a valuable feedstock for the development of more sustainable alternatives to currently used fossil fuel-based materials. Chemical analysis of cellulose remains challenging, and analytical techniques have not advanced as fast as the development of the proposed materials science applications. Crystalline cellulosic materials are insoluble in most solvents, which restricts direct analytical techniques to lower-resolution solid-state spectroscopy, destructive indirect procedures or to ‘old-school’ derivatization protocols. While investigating their use for biomass valorization, tetralkylphosphonium ionic liquids (ILs) exhibited advantageous properties for direct solution-state nuclear magnetic resonance (NMR) analysis of crystalline cellulose. After screening and optimization, the IL tetra-n-butylphosphonium acetate [P4444][OAc], diluted with dimethyl sulfoxide-d 6, was found to be the most promising partly deuterated solvent system for high-resolution solution-state NMR. The solvent system has been used for the measurement of both 1D and 2D experiments for a wide substrate scope, with excellent spectral quality and signal-to-noise, all with modest collection times. The procedure initially describes the scalable syntheses of an IL, in 24–72 h, of sufficient purity, yielding a stock electrolyte solution. The dissolution of cellulosic materials and preparation of NMR samples is presented, with pretreatment, concentration and dissolution time recommendations for different sample types. Also included is a set of recommended 1D and 2D NMR experiments with parameters optimized for an in-depth structural characterization of cellulosic materials. The time required for full characterization varies between a few hours and several days.en
dc.description.versionPeer revieweden
dc.identifier.citationFliri, L, Heise, K, Koso, T, Todorov, A R, del Cerro, D R, Hietala, S, Fiskari, J, Kilpeläinen, I, Hummel, M & King, A W T 2023, ' Solution-state nuclear magnetic resonance spectroscopy of crystalline cellulosic materials using a direct dissolution ionic liquid electrolyte ', Nature Protocols, vol. 18, no. 7, pp. 2084–2123 .
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dc.publisherNature Publishing Group
dc.relation.ispartofseriesNature Protocolsen
dc.relation.ispartofseriesVolume 18, issue 7en
dc.titleSolution-state nuclear magnetic resonance spectroscopy of crystalline cellulosic materials using a direct dissolution ionic liquid electrolyteen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi