Evaluation of the biocompatibile ionic liquid 1-methyl-3-methylimidazolium dimethylphosphite pretreatment of corn cob for improved saccharification |
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Authors: | Qiang Li Xinglin Jiang Yucai He Liangzhi Li Mo Xian Jianming Yang |
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Institution: | (1) Key Laboratory of Biofuel, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266071, China; |
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Abstract: | Ionic liquid (IL) pretreatment of lignocellulose materials is a promising process in biomass conversion to renewable biofuel.
More in-depth research involving environment-friendly IL is much needed to explore pretreatment green route. In our case,
IL 1-methyl-3-methylimidazolium dimethylphosphite (Mmim]DMP) was chosen as an environment-friendly solvent to pretreat corn
cob in view of its biocompatibility with both lignocellulose solubility and cellulase activity. The pretreatment/saccharification
process and in situ saccharification process involving Mmim]DMP were efficiently performed in bioconversion of corn cob to
sugars, and more than 70% saccharification rates were obtained. Furthermore, the fermentability of reducing sugars obtained
from the hydrolyzates was evaluated using Rhodococcus opacus strain ACCC41043 (R. opacus). High lipid production 41–43% of cell dry matter was obtained after 30 h of cultivation. GC/MS analysis indicated that lipids
from R. opacus contained mainly long-chain fatty acids with four major constituent/oleic acid, stearic acid, palmitic acid, palmitoleic
acid which are good candidates for biodiesel. These elucidated that corn cob pretreated by IL Mmim]DMP did not bring negative
effects on saccharification, cell growth, and accumulation of lipid of R. opacus. In conclusion, the IL Mmim]DMP shows promise as green pretreatment solvent for cellulosic materials. |
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