Physicochemical characterization and enzymatic digestibility of Chinese pennisetum pretreated with 1-ethyl-3-methylimidazolium acetate at moderate temperatures. (June 2016)

• Record Type: Journal Article
• Authors: Xin, Donglin; Yang, Ming; Zhang, Yage; Hou, Xincun; Wu, Juying; Fan, Xifeng; Wang, Jingfeng; Zhang, Junhua
• Is Part Of: Renewable energy. Volume 91(2016)
• Page Start: 409
• Page End: 416
• Publication Date: 2016-06
• Subjects: Chinese pennisetum -- Ionic liquid -- Pretreatment -- Moderate temperature -- Enzymatic hydrolysis; CEL cellulases -- CrI crystallinity index -- DM dry matter -- [EMIM] AC 1-ethyl-3-methylimidazolium acetate -- FPU filter paper unit -- FT-IR fourier transform infrared spectroscopy -- HPLC high-performance liquid chromatograph -- PEC pectinase -- SEM scanning electron microscopy -- XRD X-ray diffraction -- XYL xylanase; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2016.01.079
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: 1-ethyl-3-methylimidazolium acetate ([EMIM] AC) pretreatment at moderate temperatures (60 °C and 75 °C) was evaluated for improving hydrolysability of Chinese pennisetum, a leading candidate as an energy crop, for bioethanol production. The pretreatment caused slight carbohydrate and lignin loss but significantly changed the material physicochemical characters, such as crystallinity and surface structure. Both changes exhibited positive effects on improving the enzymatic digestibility of the Chinese pennisetum. It was observed that approximately 90% of the cellulose and 50% of the xylan in the Chinese pennisetum after pretreatment at 75 °C were converted to fermentable monosaccharides by the combined cellulases and endo-xylanase. The results suggested that Chinese pennisetum could be effectively pretreated with ([EMIM] AC) pretreatment at moderate temperatures, and the high hydrolysis yield of fermentable sugars from pretreated Chinese pennisetum could be achieved by the synergistic action of accessory xylanase in enzymatic hydrolysis by cellulases. Highlights: Chinese pennisetum, a new energy crop, was used as a substrate. Effect of moderate temperature was studied on ionic liquid pretreatment. Changes in crystallinity and surface structure of the material were observed. Addition of PEG6000 and PEC with CEL modestly improved the hydrolysis yield. The maximum glucose yield achieved for pretreated Chinese pennisetum was 91.2%.