Abstract
Pressurized hot water pretreatment was performed on softwood (SW) and hardwood (HW) chips following the same conditions (1 h at 170 °C) in order to partly hydrolyse hemicelluloses. The complete characterization of these sugar enriched autohydrolysates (AH) being rather complex, two different purification methods were conducted. Nanofiltration (NF) 1kDa membrane and ultrafiltration (UF) 3 and 5kDa membranes were used to separate oligosaccharides (OS) from undesired compounds and for their molar mass fractionation. Granulated activated charcoal (GAC) adsorption was also used for hydrolysates detoxification. The chemical nature of OS and side charge groups vary significantly depending of the fractions obtained, e. g. xylans' chain length is positively correlated with the degree of acetylation. UF at 5kDa allows for the total separation of galactoglucomannans (GGMs) from xylans, in SW AH, however, this result was not achieved with HW. From the acid soluble lignin (ASL) removal point of view, membrane filtration from 1kDa is more efficient than activated carbon treatment concerning HW AH, on the contrary to SW AH. Regarding the lignin to OS ratio, for both species, GAC leads to a better sugar purity.
Funding source: French National Research Agency under the Investissements d'avenir program
Award Identifier / Grant number: ANR-15-IDEX-02
Funding source: PEPS Ingénierie Verte
Award Identifier / Grant number: INSIS 2018 2019
Acknowledgements
This work was developed in the framework of Glyco@Alps, supported by the French National Research Agency under the Investissements d’avenir program (ANR-15-IDEX-02).
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Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: Part of this study was financed by CNRS under the frame of the PEPS Ingénierie Verte (INSIS 2018 2019).
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Employment or leadership: None declared.
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Honorarium: None declared.
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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