Premium
SO 2 ‐catalysed steam pretreatment of quinoa stalks
Author(s) -
Carrasco Cristhian,
Cuno Diego,
Carlqvist Karin,
Galbe Mats,
Lidén Gunnar
Publication year - 2015
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.4286
Subject(s) - hemicellulose , xylose , chemistry , bagasse , enzymatic hydrolysis , hydrolysis , steam explosion , yield (engineering) , straw , xylan , fermentation , sugar , glucan , pulp and paper industry , food science , organic chemistry , materials science , engineering , inorganic chemistry , metallurgy
Abstract BACKGROUND Quinoa 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. SO 2 catalysed steam pretreatment was carried out with a holding time of 5 min at temperatures between 180 and 220°C. The pretreatment was carried out at two different scales, a small reactor of size 0.5 L and a somewhat larger reactor of size 10 L, to allow comparison of scale effects in the pretreatment. RESULTS The highest xylose yield in the liquid phase, obtained after pretreatment at 210°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%. CONCLUSIONS SO 2 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 SO 2 . © 2013 Society of Chemical Industry