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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| Format: | Article |
| Language: | English |
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Wiley
2017-01-01
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| Series: | International Journal of Polymer Science |
| Online Access: | http://dx.doi.org/10.1155/2017/4876969 |
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| author | Paripok Phitsuwan Chutidet Permsriburasuk Sirilak Baramee Thitiporn Teeravivattanakit Khanok Ratanakhanokchai |
| author_facet | Paripok Phitsuwan Chutidet Permsriburasuk Sirilak Baramee Thitiporn Teeravivattanakit Khanok Ratanakhanokchai |
| author_sort | Paripok Phitsuwan |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-737472d769614c7e99a390d971a02504 |
| institution | Kabale University |
| issn | 1687-9422 1687-9430 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Polymer Science |
| spelling | doaj-art-737472d769614c7e99a390d971a025042025-02-03T05:54:12ZengWileyInternational Journal of Polymer Science1687-94221687-94302017-01-01201710.1155/2017/48769694876969Structural Analysis of Alkaline Pretreated Rice Straw for Ethanol ProductionParipok Phitsuwan0Chutidet Permsriburasuk1Sirilak Baramee2Thitiporn Teeravivattanakit3Khanok Ratanakhanokchai4Division of Biochemical Technology, School of Bioresources and Technology, King Mongkut’s University of Technology Thonburi, Bangkuntien, Bangkok 10150, ThailandDepartment of Chemical Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Thungkru, Bangkok 10140, ThailandDivision of Biochemical Technology, School of Bioresources and Technology, King Mongkut’s University of Technology Thonburi, Bangkuntien, Bangkok 10150, ThailandDivision of Biochemical Technology, School of Bioresources and Technology, King Mongkut’s University of Technology Thonburi, Bangkuntien, Bangkok 10150, ThailandDivision of Biochemical Technology, School of Bioresources and Technology, King Mongkut’s University of Technology Thonburi, Bangkuntien, Bangkok 10150, ThailandRice 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.http://dx.doi.org/10.1155/2017/4876969 |
| spellingShingle | Paripok Phitsuwan Chutidet Permsriburasuk Sirilak Baramee Thitiporn Teeravivattanakit Khanok Ratanakhanokchai Structural Analysis of Alkaline Pretreated Rice Straw for Ethanol Production International Journal of Polymer Science |
| title | Structural Analysis of Alkaline Pretreated Rice Straw for Ethanol Production |
| title_full | Structural Analysis of Alkaline Pretreated Rice Straw for Ethanol Production |
| title_fullStr | Structural Analysis of Alkaline Pretreated Rice Straw for Ethanol Production |
| title_full_unstemmed | Structural Analysis of Alkaline Pretreated Rice Straw for Ethanol Production |
| title_short | Structural Analysis of Alkaline Pretreated Rice Straw for Ethanol Production |
| title_sort | structural analysis of alkaline pretreated rice straw for ethanol production |
| url | http://dx.doi.org/10.1155/2017/4876969 |
| work_keys_str_mv | AT paripokphitsuwan structuralanalysisofalkalinepretreatedricestrawforethanolproduction AT chutidetpermsriburasuk structuralanalysisofalkalinepretreatedricestrawforethanolproduction AT sirilakbaramee structuralanalysisofalkalinepretreatedricestrawforethanolproduction AT thitipornteeravivattanakit structuralanalysisofalkalinepretreatedricestrawforethanolproduction AT khanokratanakhanokchai structuralanalysisofalkalinepretreatedricestrawforethanolproduction |