Characterizations of poplar catkin fibers and their potential for enzymatic hydrolysis
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This study focused on poplar (Populus tomentosa) catkin fiber as a new resource for bioethanol production via enzymatic hydrolysis. The poplar catkin fiber was found to have advantages of relatively high α-cellulose content (44.5%), and low lignin content (2.9%), which indicated the potential for facile enzymatic hydrolysis. The results indicated that the pretreatment improved the cellulose-to-glucose conversion yield (CGCY), the high concentration alkaline pretreatment resulted in highest CGCY (83.3%), followed by dewaxing (31.5%), dilute alkaline (29.8%), and dilute acid pretreatment (24.4%) after enzymatic hydrolysis with cellulase of 15 filter paper units per gram glucan, while the poplar catkin fiber only achieved 18.7% of CGCY by enzymatic hydrolysis after 48 h at 50 °C without any pretreatment.
KeywordsPoplar catkin fiber Enzymatic hydrolysis Dilute acid pretreatment Alkali pretreatment Dewaxing pretreatment
We gratefully acknowledge funding for this project by National Science Foundation of China (31400519) and the Basic Scientific Research Funds of International Center for Bamboo and Rattan (1632016007).
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