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Polymers 2018, 10(6), 619; https://doi.org/10.3390/polym10060619

Acetyl Groups in Typha capensis: Fate of Acetates during Organosolv and Ionosolv Pulping

1
Chair of Forest Biomaterials, University of Freiburg, Werthmannstr. 6, 79085 Freiburg im Breisgau, Germany
2
Laboratoire d'Étude et de Recherche sur le Matériau Bois LERMAB, Faculty of Science and Technology, University of Lorraine, Boulevard des Aiguillettes, BP 70239, 54506 Vandœuvre lès Nancy CEDEX, France
3
Freiburg Materials Research Center (FMF), University of Freiburg, Stefan-Meier-Str. 21, 79104 Freiburg im Breisgau, Germany
4
Institute of Plant and Wood Chemistry, Technische Universität Dresden, Pienner Straße 19, 01737 Tharandt, Germany
*
Author to whom correspondence should be addressed.
Received: 13 December 2017 / Revised: 28 May 2018 / Accepted: 31 May 2018 / Published: 5 June 2018
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Abstract

During biomass fractionation, any native acetylation of lignin and heteropolysaccharide may affect the process and the resulting lignin structure. In this study, Typha capensis (TC) and its lignin isolated by milling (MWL), ionosolv (ILL) and organosolv (EOL) methods were investigated for acetyl group content using FT-Raman, 1H NMR, 2D-NMR, back-titration, and Zemplén transesterification analytical methods. The study revealed that TC is a highly acetylated grass; extractive free TC (TCextr) and TC MWL exhibited similar values of acetyl content: 6 wt % and 8 wt % by Zemplén transesterification, respectively, and 11 wt % by back-titration. In contrast, lignin extracted from organosolv and [EMIm][OAc] pulping lost 80% of the original acetyl groups. With a high acetyl content in the natural state, TC could be an interesting raw material in biorefinery in which acetic acid could become an important by-product. View Full-Text
Keywords: Typha capensis; native acetate; lignin; MWL; ionic liquid lignin; ethanol organosolv lignin Typha capensis; native acetate; lignin; MWL; ionic liquid lignin; ethanol organosolv lignin
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Audu, I.G.; Brosse, N.; Winter, H.; Hoffmann, A.; Bremer, M.; Fischer, S.; Laborie, M.-P. Acetyl Groups in Typha capensis: Fate of Acetates during Organosolv and Ionosolv Pulping. Polymers 2018, 10, 619.

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