Structural Analysis of Alkaline Pretreated Rice Straw for Ethanol Production
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Author list: Phitsuwan P., Permsriburasuk C., Baramee S., Teeravivattanakit T., Ratanakhanokchai K.
Publisher: Hindawi
Publication year: 2017
Journal: International Journal of Polymer Science (1687-9422)
Volume number: 2017
ISSN: 1687-9422
eISSN: 1687-9430
Languages: English-Great Britain (EN-GB)
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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 60ฐC. 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. ฉ 2017 Paripok Phitsuwan et al.
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