Structural Analysis of Alkaline Pretreated Rice Straw for Ethanol Production

Rice straw (RS) is an abundant, readily available agricultural waste, which shows promise as a potential feedstock for Asian ethanol production. To enhance release of glucose by enzymatic hydrolysis, RS was pretreated with aqueous ammonia (27% w/w) at two pretreatment temperatures: room temperature...

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Published inInternational Journal of Polymer Science Vol. 2017; no. 2017; pp. 1 - 9
Main Authors Teeravivattanakit, Thitiporn, Baramee, Sirilak, Permsriburasuk, Chutidet, Phitsuwan, Paripok, Ratanakhanokchai, Khanok
Format Journal Article
LanguageEnglish
Published Cairo, Egypt Hindawi Publishing Corporation 01.01.2017
Hindawi
John Wiley & Sons, Inc
Wiley
Subjects
Acids
Agricultural wastes
Alcohol
Alcohol, Denatured
Alternative energy sources
Ammonia
Biochemistry
Biodiesel fuels
Biomass
Biotechnology
Carbohydrates
Cellulase
Cellulose
Cellulose fibers
Chemical composition
Crystallinity
Dextrose
Enzymes
Ethanol
Fermentation
Glucan
Glucose
Hydrolysis
Lignin
Lignocellulose
Porosity
Pretreatment
Production data
Raw materials
Refining
Saccharification
Silicon dioxide
Statistical analysis
Straw
Structural analysis
Thailand
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Abstract Rice straw (RS) is an abundant, readily available agricultural waste, which shows promise as a potential feedstock for Asian ethanol production. To enhance release of glucose by enzymatic hydrolysis, RS was pretreated with aqueous ammonia (27% w/w) at two pretreatment temperatures: room temperature and 60°C. Statistical analysis indicated similarity of enzymatic glucose production at both pretreatment temperatures after 3-day incubation. Chemical composition, FTIR, and EDX analyses confirmed the retention of glucan and xylan in the pretreated solid, but significant reduction of lignin (60.7% removal) and silica. SEM analysis showed the disorganized surfaces and porosity of the pretreated RS fibers, thus improving cellulose accessibility for cellulase. The crystallinity index increased from 40.5 to 52.3%, indicating the higher exposure of cellulose. With 10% (w/v) solid loadings of pretreated RS, simultaneous saccharification and fermentation yielded a final ethanol concentration of 24.6 g/L, corresponding to 98% of maximum theoretical yield. Taken together, aqueous ammonia pretreatment is an effective method to generate highly digestible pretreated RS for bioethanol production and demonstrates potential application in biorefinery industry.
AbstractList Rice straw (RS) is an abundant, readily available agricultural waste, which shows promise as a potential feedstock for Asian ethanol production. To enhance release of glucose by enzymatic hydrolysis, RS was pretreated with aqueous ammonia (27% w/w) at two pretreatment temperatures: room temperature and 60[degrees]C. Statistical analysis indicated similarity of enzymatic glucose production at both pretreatment temperatures after 3-day incubation. Chemical composition, FTIR, and EDX analyses confirmed the retention of glucan and xylan in the pretreated solid, but significant reduction of lignin (60.7% removal) and silica. SEM analysis showed the disorganized surfaces and porosity of the pretreated RS fibers, thus improving cellulose accessibility for cellulase. The crystallinity index increased from 40.5 to 52.3%, indicating the higher exposure of cellulose. With 10% (w/v) solid loadings of pretreated RS, simultaneous saccharification and fermentation yielded a final ethanol concentration of 24.6 g/L, corresponding to 98% of maximum theoretical yield. Taken together, aqueous ammonia pretreatment is an effective method to generate highly digestible pretreated RS for bioethanol production and demonstrates potential application in biorefinery industry.
Rice straw (RS) is an abundant, readily available agricultural waste, which shows promise as a potential feedstock for Asian ethanol production. To enhance release of glucose by enzymatic hydrolysis, RS was pretreated with aqueous ammonia (27% w/w) at two pretreatment temperatures: room temperature and 60°C. Statistical analysis indicated similarity of enzymatic glucose production at both pretreatment temperatures after 3-day incubation. Chemical composition, FTIR, and EDX analyses confirmed the retention of glucan and xylan in the pretreated solid, but significant reduction of lignin (60.7% removal) and silica. SEM analysis showed the disorganized surfaces and porosity of the pretreated RS fibers, thus improving cellulose accessibility for cellulase. The crystallinity index increased from 40.5 to 52.3%, indicating the higher exposure of cellulose. With 10% (w/v) solid loadings of pretreated RS, simultaneous saccharification and fermentation yielded a final ethanol concentration of 24.6 g/L, corresponding to 98% of maximum theoretical yield. Taken together, aqueous ammonia pretreatment is an effective method to generate highly digestible pretreated RS for bioethanol production and demonstrates potential application in biorefinery industry.
Audience Academic
Author Teeravivattanakit, Thitiporn
Permsriburasuk, Chutidet
Ratanakhanokchai, Khanok
Phitsuwan, Paripok
Baramee, Sirilak
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ContentType Journal Article
Copyright Copyright © 2017 Paripok Phitsuwan et al.
COPYRIGHT 2017 John Wiley & Sons, Inc.
Copyright © 2017 Paripok Phitsuwan et al.; This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright_xml – notice: Copyright © 2017 Paripok Phitsuwan et al.
– notice: COPYRIGHT 2017 John Wiley & Sons, Inc.
– notice: Copyright © 2017 Paripok Phitsuwan et al.; This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Snippet Rice straw (RS) is an abundant, readily available agricultural waste, which shows promise as a potential feedstock for Asian ethanol production. To enhance...
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SubjectTerms Acids
Agricultural wastes
Alcohol
Alcohol, Denatured
Alternative energy sources
Ammonia
Biochemistry
Biodiesel fuels
Biomass
Biotechnology
Carbohydrates
Cellulase
Cellulose
Cellulose fibers
Chemical composition
Crystallinity
Dextrose
Enzymes
Ethanol
Fermentation
Glucan
Glucose
Hydrolysis
Lignin
Lignocellulose
Porosity
Pretreatment
Production data
Raw materials
Refining
Saccharification
Silicon dioxide
Statistical analysis
Straw
Structural analysis
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Title Structural Analysis of Alkaline Pretreated Rice Straw for Ethanol Production
URI https://search.emarefa.net/detail/BIM-1169006
https://dx.doi.org/10.1155/2017/4876969
https://www.proquest.com/docview/1932732127
https://doaj.org/article/737472d769614c7e99a390d971a02504
Volume 2017
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