phaidra.vetmeduni.ac.at o:3880 DOI 10.1007/s10570-024-06249-1 Negative effect and removal of trace amounts of 1,3-dialkylimidazolium ionic liquids in samples from biorefineries Ionic liquids (ILs), based on 1,3-dialkylimidazolium cations, are frequently used solvent components or auxiliaries for various types of biomass in biorefinery approaches. Unless washing and sample preparation have been carried out very carefully, analytical samples often contain residual traces of such ionic liquids. These residues can compromise the quality of physicochemical analyses, as was demonstrated for monosaccharide analysis after hydrolysis by gas chromatography, high-performance thin-layer chromatography, or ion chromatography (IC), and even damage analytical equipment, such as gas chromatographic capillaries or IC electrodes. We suggest a simple procedure-short stirring with solid elemental sulfur adsorbed on alumina as the scavenger-as a pretreatment of the analytical samples to remove interfering imidazolium IL traces. The chemistry underlying this pretreatment is the conversion of the 1,3-dialkylimidazolium cation to the corresponding, water-insoluble, neutral, volatile 1,3-dialkylimidazole-2-thiones. Given the negative effect of imidazolium IL impurities, the minor extension of the sample preparation by one short additional step appears to be a small price to pay for an unperturbed and instrument-safe analysis. eng Anion-Exchange Chromatography Cellulose Pretreatment Insights Polysaccharides Identification Acetylation Dissolution Biomass 2025-02-21T09:31:40.446Z LOMv1.0 Author BEGIN:VCARD VERSION:3.0 N:Lehrhofer;Anna F.; FN:Anna F. Lehrhofer X-ORCID:https://orcid.org/0000-0003-0287-3350 END:VCARD BEGIN:VCARD VERSION:3.0 N:Yoneda;Yuko; FN:Yuko Yoneda X-ORCID:https://orcid.org/0009-0008-9845-7274 END:VCARD BEGIN:VCARD VERSION:3.0 N:Tran;Thi Hoai; FN:Thi Hoai Tran X-ORCID:https://orcid.org/0000-0001-5372-5310 END:VCARD BEGIN:VCARD VERSION:3.0 N:Melikhov;Ivan; FN:Ivan Melikhov X-ORCID:https://orcid.org/0000-0003-3950-0160 END:VCARD BEGIN:VCARD VERSION:3.0 N:Gille;Lars; FN:Lars Gille X-ORCID:https://orcid.org/0000-0003-1223-0201 END:VCARD BEGIN:VCARD VERSION:3.0 N:Hettegger;Hubert; FN:Hubert Hettegger X-ORCID:https://orcid.org/0000-0002-9343-5673 END:VCARD BEGIN:VCARD VERSION:3.0 N:Böhmdorfer;Stefan; FN:Stefan Böhmdorfer X-ORCID:https://orcid.org/0000-0003-1400-3395 END:VCARD BEGIN:VCARD VERSION:3.0 N:Potthast;Antje; FN:Antje Potthast X-ORCID:https://orcid.org/0000-0003-1981-2271 END:VCARD BEGIN:VCARD VERSION:3.0 N:Schottenberger;Herwig; FN:Herwig Schottenberger X-ORCID:https://orcid.org/0000-0002-5212-9020 END:VCARD BEGIN:VCARD VERSION:3.0 N:Rosenau;Thomas; FN:Thomas Rosenau X-ORCID:https://orcid.org/0000-0002-6636-9260 END:VCARD https://w3id.org/kim/hcrt/scheme https://w3id.org/kim/hcrt/text Textdokument Text LOMv1.0 yes https://creativecommons.org/licenses/by/4.0 application/pdf 1258527 https://phaidra.vetmeduni.ac.at/o:3880 https://phaidra.vetmeduni.ac.at/api/object/o:3880/thumbnail LOMv1.0 discipline