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

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 (TC_extr) 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.

SUBMITTER: Audu IG

PROVIDER: S-EPMC6404047 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature

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Acetyl Groups in <i>Typha capensis</i>: Fate of Acetates during Organosolv and Ionosolv Pulping.

Audu Idi Guga IG Brosse Nicolas N Winter Heiko H Hoffmann Anton A Bremer Martina M Fischer Steffen S Laborie Marie-Pierre MP

Polymers 20180605 6

During biomass fractionation, any native acetylation of lignin and heteropolysaccharide may affect the process and the resulting lignin structure. In this study, <i>Typha capensis</i> (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 (TC<su ...[more]

PMID: 30966652

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