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SO2-catalysed steam pretreatment of quinoa stalks

Carrasco, Cristhian LU ; Cuno, Diego; Carlqvist, Karin LU ; Galbe, Mats LU and Lidén, Gunnar LU (2015) In Journal of Chemical Technology and Biotechnology 90(1). p.64-71
Abstract
BACKGROUNDQuinoa is a pseudo-cereal grown predominantly in South America. The quinoa stalks are lignocellulosic residues, which have a limited use today. The objective of the current study was to assess the potential of this material as a source of monosaccharides for fermentation purposes by means of steam pretreatment giving sugars from the hemicellulose part, and enzymatic hydrolysis of the solid fraction obtained. SO2 catalysed steam pretreatment was carried out with a holding time of 5min at temperatures between 180 and 220 degrees C. The pretreatment was carried out at two different scales, a small reactor of size 0.5L and a somewhat larger reactor of size 10L, to allow comparison of scale effects in the pretreatment. RESULTSThe... (More)
BACKGROUNDQuinoa is a pseudo-cereal grown predominantly in South America. The quinoa stalks are lignocellulosic residues, which have a limited use today. The objective of the current study was to assess the potential of this material as a source of monosaccharides for fermentation purposes by means of steam pretreatment giving sugars from the hemicellulose part, and enzymatic hydrolysis of the solid fraction obtained. SO2 catalysed steam pretreatment was carried out with a holding time of 5min at temperatures between 180 and 220 degrees C. The pretreatment was carried out at two different scales, a small reactor of size 0.5L and a somewhat larger reactor of size 10L, to allow comparison of scale effects in the pretreatment. RESULTSThe highest xylose yield in the liquid phase, obtained after pretreatment at 210 degrees C, was 80%. In the smaller scale unit, longer residence times were needed. The enzymatic hydrolysis, at an enzyme loading of 15 FPU g(-1) glucan and a WIS loading of 2%, resulted in a glucose yield of 70% based on the original glucan. The overall sugar yield, including the xylan hydrolysed in the enzymatic treatment, at dilute conditions was 75%. CONCLUSIONSSO2 catalysed pretreatment of quinoa straw followed by enzymatic hydrolysis gave a relatively good sugar yield. However, the yield obtained was somewhat lower than previously reported for similar materials, such as wheat straw and sugarcane bagasse, steam pretreated with SO2. (c) 2013 Society of Chemical Industry (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
xylose, quinoa stalks, steam pretreatment, SO2
in
Journal of Chemical Technology and Biotechnology
volume
90
issue
1
pages
64 - 71
publisher
Wiley-Blackwell
external identifiers
  • wos:000345845400010
  • scopus:84912523922
ISSN
0268-2575
DOI
10.1002/jctb.4286
language
English
LU publication?
yes
id
5f86b01c-fe92-41ae-8ca9-d22c8e342d74 (old id 4962593)
date added to LUP
2015-01-29 11:54:36
date last changed
2017-11-12 03:42:12
@article{5f86b01c-fe92-41ae-8ca9-d22c8e342d74,
  abstract     = {BACKGROUNDQuinoa is a pseudo-cereal grown predominantly in South America. The quinoa stalks are lignocellulosic residues, which have a limited use today. The objective of the current study was to assess the potential of this material as a source of monosaccharides for fermentation purposes by means of steam pretreatment giving sugars from the hemicellulose part, and enzymatic hydrolysis of the solid fraction obtained. SO2 catalysed steam pretreatment was carried out with a holding time of 5min at temperatures between 180 and 220 degrees C. The pretreatment was carried out at two different scales, a small reactor of size 0.5L and a somewhat larger reactor of size 10L, to allow comparison of scale effects in the pretreatment. RESULTSThe highest xylose yield in the liquid phase, obtained after pretreatment at 210 degrees C, was 80%. In the smaller scale unit, longer residence times were needed. The enzymatic hydrolysis, at an enzyme loading of 15 FPU g(-1) glucan and a WIS loading of 2%, resulted in a glucose yield of 70% based on the original glucan. The overall sugar yield, including the xylan hydrolysed in the enzymatic treatment, at dilute conditions was 75%. CONCLUSIONSSO2 catalysed pretreatment of quinoa straw followed by enzymatic hydrolysis gave a relatively good sugar yield. However, the yield obtained was somewhat lower than previously reported for similar materials, such as wheat straw and sugarcane bagasse, steam pretreated with SO2. (c) 2013 Society of Chemical Industry},
  author       = {Carrasco, Cristhian and Cuno, Diego and Carlqvist, Karin and Galbe, Mats and Lidén, Gunnar},
  issn         = {0268-2575},
  keyword      = {xylose,quinoa stalks,steam pretreatment,SO2},
  language     = {eng},
  number       = {1},
  pages        = {64--71},
  publisher    = {Wiley-Blackwell},
  series       = {Journal of Chemical Technology and Biotechnology},
  title        = {SO2-catalysed steam pretreatment of quinoa stalks},
  url          = {http://dx.doi.org/10.1002/jctb.4286},
  volume       = {90},
  year         = {2015},
}