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Multi-step purification method of water-soluble oligosaccharides produced from hardwood and softwood

Authors
  • Francillon, Juliette1
  • Chirat, Christine2
  • Boisset, Claire3
  • Buon, Laurine3
  • 1 CNRS, CERMAV, France , (France)
  • 2 CNRS, Institute of Engineering Université Grenoble-Alpes (Grenoble INP), LGP2, France , (France)
  • 3 Université Grenoble Alpes, CNRS, CERMAV , (France)
Type
Published Article
Journal
Holzforschung
Publisher
De Gruyter
Publication Date
Jun 02, 2020
Volume
74
Issue
6
Pages
615–623
Identifiers
DOI: 10.1515/hf-2019-0273
Source
De Gruyter
Keywords
License
Yellow

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.

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