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Analysis, pretreatment and enzymatic saccharification of different fractions of Scots pine
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Department of Forest Biomaterials and Technology, Swedish University of Agricultural Sciences, Umeå, Sweden.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
2014 (English)In: BMC Biotechnology, ISSN 1472-6750, E-ISSN 1472-6750, Vol. 14, 20Article in journal (Refereed) Published
Abstract [en]

Background: Forestry residues consisting of softwood are a major lignocellulosic resource for production of liquid biofuels. Scots pine, a commercially important forest tree, was fractionated into seven fractions of chips: juvenile heartwood, mature heartwood, juvenile sapwood, mature sapwood, bark, top parts, and knotwood. The different fractions were characterized analytically with regard to chemical composition and susceptibility to dilute-acid pretreatment and enzymatic saccharification. Results: All fractions were characterized by a high glucan content (38-43%) and a high content of other carbohydrates (11-14% mannan, 2-4% galactan) that generate easily convertible hexose sugars, and by a low content of inorganic material (0.2-0.9% ash). The lignin content was relatively uniform (27-32%) and the syringyl-guaiacyl ratio of the different fractions were within the range 0.021-0.025. The knotwood had a high content of extractives (9%) compared to the other fractions. The effects of pretreatment and enzymatic saccharification were relatively similar, but without pretreatment the bark fraction was considerably more susceptible to enzymatic saccharification. Conclusions: Since sawn timber is a main product from softwood species such as Scots pine, it is an important issue whether different parts of the tree are equally suitable for bioconversion processes. The investigation shows that bioconversion of Scots pine is facilitated by that most of the different fractions exhibit relatively similar properties with regard to chemical composition and susceptibility to techniques used for bioconversion of woody biomass.

Place, publisher, year, edition, pages
BioMed Central, 2014. Vol. 14, 20
Keyword [en]
Scots pine, Chemical composition, Dilute-acid pretreatment, Enzymatic saccharification
National Category
Microbiology Agricultural Biotechnology
URN: urn:nbn:se:umu:diva-89235DOI: 10.1186/1472-6750-14-20ISI: 000334881900001OAI: diva2:719700
Available from: 2014-05-26 Created: 2014-05-26 Last updated: 2016-10-07Bibliographically approved
In thesis
1. Pretreatment and enzymatic saccharification of lignocellulose: formation and effects of pseudolignin
Open this publication in new window or tab >>Pretreatment and enzymatic saccharification of lignocellulose: formation and effects of pseudolignin
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Production of advanced biofuels, green chemicals, and bio-based materials from renewable lignocellulosic biomass would contribute to decreased dependence on fossil resources and to sustainable development. The overall aim of the investigations was to explore how preprocessing and pretreatment technologies affected the chemical composition of cellulosic materials and their susceptibility to enzymatic saccharification, which is one of the major routes for biorefining of lignocellulose. Special attention was given to formation and effects of pseudolignin, an aromatic substance derived from polysaccharides. Pseudolignin is formed during dry thermal preprocessing, such as torrefaction, and during dilute-acid pretreatment, techniques that are highly relevant for biorefining of wood.

The susceptibility of seven fractions of Scots pine to dilute-acid pretreatment and enzymatic saccharification was investigated. Harsh pretreatment conditions led to slow initial conversion, which was tentatively attributed to pseudolignin. Pretreatment with ionic liquids was investigated using substrates consisting of crystalline and amorphous cellulose, hemicelluloses, and wood. The susceptibility of torrefied spruce wood to enzymatic saccharification after pretreatment with acid or ionic liquid was investigated. The results showed that the negative effects of mild torrefaction on enzymatic saccharification were possible to overcome using pretreatment with the ionic liquid. In a subsequent study, the possibility to dissolve pseudolignin with ionic liquids and conventional solvents was explored. The effects of pseudolignin on wood polysaccharides and enzymatic saccharification were further studied using NMR, FTIR, XPS, TOF-SIMS, and SEM. The surface-sensitive analytical methods TOF-SIMS, XPS, and SEM revealed how pseudolignin formed a coat on the surface of the polysaccharide, which could explain the effects on the enzymatic saccharification.

Place, publisher, year, edition, pages
Umeå: Umeå Universitet, 2016. 67 p.
Pretreatment, enzymatic saccharification, ionic liquid, torrefaction, pseudolignin
National Category
Analytical Chemistry
Research subject
Analytical Chemistry
urn:nbn:se:umu:diva-126463 (URN)978-91-7601-575-9 (ISBN)
Public defence
2016-10-28, KB3B1, KBC-huset, Linnaeus väg 6, 907 36, Umeå, 13:00 (English)
Available from: 2016-10-07 Created: 2016-10-06 Last updated: 2016-10-07Bibliographically approved

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