Enhanced enzymatic hydrolysis of poplar bark by combined use of gamma ray and dilute acid for bioethanol production |
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| Authors: | Byung Yeoup Chung Jae Taek Lee Hyoung-Woo Bai Ung-Jin Kim Hyeun-Jong Bae Seung Gon Wi Jae-Young Cho |
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| Institution: | 1. Advanced Radiation Technology Institute (ARTI), Korea Atomic Energy Research Institute (KAERI), Jeongeup 580-185, Republic of Korea;2. Department of Plant & Environmental New Resources, KyungHee University, Yongin 446-701, Republic of Korea;3. Department of Bioenergy Science and Technology, Chonnam National University, Gwangju 500-757, Republic of Korea;4. Department of Bioenvironmental Chemistry, Chonbuk National University, Jeonju 561-756, Republic of Korea;1. Research Center of Supercritical Fluid Technology, Graduate School of Engineering, Tohoku University, Sendai, Japan;2. Graduate School of Environmental Studies, Tohoku University, Sendai, Japan;1. International Centre for Bamboo and Rattan, Beijing 100102, China;2. USDA Forest Service, Forest Products Laboratory, 1 Gifford Pinchot Dr., Madison, WI 53726, United States;3. Biological Systems Engineering, University of Wisconsin, 460 Henry Mall, Madison, WI 53706, United States;1. Laboratório Nacional de Energia e Geologia, I.P. (LNEG), Unidade de Bioenergia, Estrada do Paço do Lumiar 22, 1649-038 Lisboa, Portugal;2. Instituto Superior de Agronomia (ISA), Universidade de Lisboa, Linking Landscape, Environment, Agriculture and Food (LEAF), Tapada da Ajuda, 1349-017 Lisboa, Portugal;1. Department of Chemical Engineering, Universidad Autónoma de Nayarit, Tepic, Mexico;2. Department of Chemical Engineering and Materials Science, DOE Great Lakes Bioenergy Research Center, Michigan State University, East Lansing, MI, United States;3. Biorefinery Group, Food Research Department, School of Chemistry, Autonomous University of Coahuila, Saltillo, Coahuila, Mexico;4. Department of Chemical Engineering and Conn Center for Renewable Energy Research, University of Louisville, Louisville, KY, United States;5. Joint BioEnergy Institute, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Emeryville, CA, United States;6. Sandia National Laboratories, Biological and Engineering Sciences Center, Livermore, CA, United States |
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| Abstract: | Pretreatment of poplar bark with a combination of sulfuric acid (3%, w/w, H2SO4) and gamma irradiation (0–1000 kGy) was performed in an attempt to enhance enzymatic hydrolysis for bioethanol production. The yields of reducing sugar were slightly increased with an increasing irradiation dose, ranging from 35.4% to 51.5%, with a 56.1% reducing sugar yield observed after dilute acid pretreatment. These results clearly showed that soluble sugars were released faster and to a greater extent in dilute acid-pretreated poplar bark than in gamma irradiation-pretreated bark. When combined pretreatment was carried out, a drastic increase in reducing sugar yield (83.1%) was found compared with individual pretreatment, indicating the possibility of increasing the convertibility of poplar bark following combined pretreatment. These findings are likely associated with cellulose crystallinity, lignin modification, and removal of hemicelluloses. |
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