Removal of Water-Soluble Extractives Improves the Enzymatic Digestibility of Steam-Pretreated Softwood Barks
Frankó, Balázs LU ; Carlqvist, Karin LU ; Galbe, Mats LU ; Lidén, Gunnar LU and Wallberg, Ola LU
(2018)
In Applied Biochemistry and Biotechnology
184(2).
p.599-615
- Abstract
Softwood bark contains a large amounts of extractives—i.e., soluble lipophilic (such as resin acids) and hydrophilic components (phenolic compounds, stilbenes). The effects of the partial removal of water-soluble extractives before acid-catalyzed steam pretreatment on enzymatic digestibility were assessed for two softwood barks—Norway spruce and Scots pine. A simple hot water extraction step removed more than half of the water-soluble extractives from the barks, which improved the enzymatic digestibility of both steam-pretreated materials. This effect was more pronounced for the spruce than the pine bark, as evidenced by the 30 and 11% glucose yield improvement, respectively, in the enzymatic digestibility. Furthermore, analysis of the... (More)
Softwood bark contains a large amounts of extractives—i.e., soluble lipophilic (such as resin acids) and hydrophilic components (phenolic compounds, stilbenes). The effects of the partial removal of water-soluble extractives before acid-catalyzed steam pretreatment on enzymatic digestibility were assessed for two softwood barks—Norway spruce and Scots pine. A simple hot water extraction step removed more than half of the water-soluble extractives from the barks, which improved the enzymatic digestibility of both steam-pretreated materials. This effect was more pronounced for the spruce than the pine bark, as evidenced by the 30 and 11% glucose yield improvement, respectively, in the enzymatic digestibility. Furthermore, analysis of the chemical composition showed that the acid-insoluble lignin content of the pretreated materials decreased when water-soluble extractives were removed prior to steam pretreatment. This can be explained by a decreased formation of water-insoluble “pseudo-lignin” from water-soluble bark phenolics during the acid-catalyzed pretreatment, which otherwise results in distorted lignin analysis and may also contribute to the impaired enzymatic digestibility of the barks. Thus, this study advocates the removal of extractives as the first step in the processing of bark or bark-rich materials in a sugar platform biorefinery.
(Less)
- author
- Frankó, Balázs
LU
; Carlqvist, Karin
LU
; Galbe, Mats
LU
; Lidén, Gunnar
LU
and Wallberg, Ola
LU
- organization
- publishing date
- 2018-02
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Bark, Enzymatic saccharification, Extractives, Softwood, Steam pretreatment
- in
- Applied Biochemistry and Biotechnology
- volume
- 184
- issue
- 2
- pages
- 599 - 615
- publisher
- Humana Press
- external identifiers
-
- pmid:28808883
- scopus:85028539045
- ISSN
- 0273-2289
- DOI
- 10.1007/s12010-017-2577-2
- language
- English
- LU publication?
- yes
- id
- c616b322-19fb-4c43-a3e3-2e786c8b6d07
- date added to LUP
- 2017-09-18 22:41:46
- date last changed
- 2024-04-14 17:55:46
@article{c616b322-19fb-4c43-a3e3-2e786c8b6d07,
abstract = {{<p>Softwood bark contains a large amounts of extractives—i.e., soluble lipophilic (such as resin acids) and hydrophilic components (phenolic compounds, stilbenes). The effects of the partial removal of water-soluble extractives before acid-catalyzed steam pretreatment on enzymatic digestibility were assessed for two softwood barks—Norway spruce and Scots pine. A simple hot water extraction step removed more than half of the water-soluble extractives from the barks, which improved the enzymatic digestibility of both steam-pretreated materials. This effect was more pronounced for the spruce than the pine bark, as evidenced by the 30 and 11% glucose yield improvement, respectively, in the enzymatic digestibility. Furthermore, analysis of the chemical composition showed that the acid-insoluble lignin content of the pretreated materials decreased when water-soluble extractives were removed prior to steam pretreatment. This can be explained by a decreased formation of water-insoluble “pseudo-lignin” from water-soluble bark phenolics during the acid-catalyzed pretreatment, which otherwise results in distorted lignin analysis and may also contribute to the impaired enzymatic digestibility of the barks. Thus, this study advocates the removal of extractives as the first step in the processing of bark or bark-rich materials in a sugar platform biorefinery.</p>}},
author = {{Frankó, Balázs and Carlqvist, Karin and Galbe, Mats and Lidén, Gunnar and Wallberg, Ola}},
issn = {{0273-2289}},
keywords = {{Bark; Enzymatic saccharification; Extractives; Softwood; Steam pretreatment}},
language = {{eng}},
number = {{2}},
pages = {{599--615}},
publisher = {{Humana Press}},
series = {{Applied Biochemistry and Biotechnology}},
title = {{Removal of Water-Soluble Extractives Improves the Enzymatic Digestibility of Steam-Pretreated Softwood Barks}},
url = {{http://dx.doi.org/10.1007/s12010-017-2577-2}},
doi = {{10.1007/s12010-017-2577-2}},
volume = {{184}},
year = {{2018}},
}