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Combined alkali and hydrothermal pretreatments for oat straw valorization within a biorefinery concept
- Source :
- Repositório Científico de Acesso Aberto de Portugal, Repositório Científico de Acesso Aberto de Portugal (RCAAP), instacron:RCAAP
- Publication Year :
- 2016
- Publisher :
- Elsevier B.V., 2016.
-
Abstract
- The aim of this work was the evaluation of lime pretreatment combined or not with previous step of autohydrolysis for oat straw valorization. Under selected conditions of lime pretreatment, 96% of glucan and 77% of xylan were recovered and 42% of delignification was achieved. Xylose fermentation to ethanol by metabolic engineered Saccharomyces cerevisiae (MEC1133) strain improved the ethanol production by 22% achieving 41 g/L. Alternatively, first step of autohydrolysis (S0=4.22) allowed a high oligosaccharides recovery (68%) and subsequent lime pretreatment attained a 57% of delignification and 99% of glucan to glucose conversion. Oat straw processed by autohydrolysis and lime pretreatment reached the maximal ethanol concentration (50 g/L). Both strategies led to oat straw valorization into bioethanol, oligosaccharides and lignin indicating that these pretreatments are adequate as a first stage within an oat straw biorefinery.<br />The authors thank the financial support from the Strategic Project of UID/BIO/04469/2013 CEB Unit (Funding agency for Science and Technology, FCT, Portugal) and for the Project CTQ2012-30855 of the Spanish "Ministry of Science and Innovation", partially funded by the FEDER program of the European Union. A Romani thanks her post-doctoral grant funded by Xunta of Galicia (Plan I2C, 2014).
- Subjects :
- 0106 biological sciences
Environmental Engineering
animal structures
Avena
Oligosaccharides
Bioengineering
Bioethanol
Saccharomyces cerevisiae
Alkalies
010501 environmental sciences
engineering.material
Lignin
01 natural sciences
complex mixtures
chemistry.chemical_compound
Polysaccharides
010608 biotechnology
Lime pretreatment
Ethanol fuel
Waste Management and Disposal
0105 earth and related environmental sciences
Lime
Glucan
chemistry.chemical_classification
Xylose
Ethanol
Science & Technology
Renewable Energy, Sustainability and the Environment
Hydrolysis
food and beverages
Oxides
General Medicine
Calcium Compounds
Biorefinery
Pulp and paper industry
Xylan
Glucose
Metabolic Engineering
chemistry
Agronomy
Autohydrolysis
Biofuel
Fermentation
engineering
Oat straw
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Repositório Científico de Acesso Aberto de Portugal, Repositório Científico de Acesso Aberto de Portugal (RCAAP), instacron:RCAAP
- Accession number :
- edsair.doi.dedup.....df98e2676e53097f62991cf1447d6304