Effect of ionic liquid pretreatment on the chemical composition, structure and enzymatic hydrolysis of energy cane bagasse

Qiu, Zenghui; Aita, Giovanna M.; Walker, Michelle S.

doi:10.1016/j.biortech.2012.04.070

Cited by 218 publications

(93 citation statements)

References 33 publications

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“…[mmim][dmp] and its crystalline structure was modified to amorphous structure, cellulose II. The cellulose II, which was modified to amorphous structure was easy attacked by enzyme in hydrolysis process producing fermentable sugars, so the yield of sugar improved significantly as previously published authors [7,14,27,31].…”

Section: Characterization Of the Ionic Liquid [Mmim][dmp]mentioning

confidence: 61%

Preparation of Reducing Sugar Hydrolyzed from High-Lignin Coconut Coir Dust Pretreated by the Recycled Ionic Liquid [mmim][dmp] and Combination with Alkaline

Sangian

Kristian

Rahma

et al. 2014

Bull. Chem. React. Eng. Catal.

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This study aims to produce reducing sugar hydrolyzed from substrate, coconut coir dust pretreated by recycled ionic liquid and its combination with alkaline. The 1H NMR and FTIR were performed to ver-ify the synthesized ionic liquid methylmethylimidazolium dimethyl phosphate ([mmim][dmp]). The structure of pretreated substrates was analyzed by XRD measurement. The used ionic liquid was recy-cled twice to re-employ for substrate pretreatment. The treated- and untreated-coconut coir dust were hydrolyzed into sugars using pure cellulase. The reaction, which called an enzymatic hydrolysis, was conducted at 60 °C, pH 3, for 48 h. The yields of sugar hydrolyzed from fresh IL-pretreated, 1R*IL-pretreated and 2R*IL-pretreated substrates were of 0.19, 0.15 and 0.15 g sugar / g cellu-lose+hemicellulose, respectively. Pretreatment with NaOH or the combination of NaOH+IL resulted in yields of reducing sugars of 0.25, 0.28 g/g, respectively. When alkaline combined with the recycled ionic liquids, NaOH+1R*IL, NaOH+2R*IL in the pretreatment, the yields of sugar were relatively similar to those obtained using alkaline followed by fresh ionic liquid. If the mixture enzymes, cellu-lase+xylanase, used to liberate sugars from fresh IL-pretreated, or recycled IL-pretreated substrates, the amount of sugar (concentration or yield) increased slightly compared to that employing a single cel-lulase. These findings showed that recycled IL pretreatment of the high-lignin lignocellulose, coconut coir dust, is a new prospect for the economical manufacture of fermentable sugars and biofuel in the coming years. © 2015 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0)

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Section: Characterization Of the Ionic Liquid [Mmim][dmp]mentioning

confidence: 61%

Preparation of Reducing Sugar Hydrolyzed from High-Lignin Coconut Coir Dust Pretreated by the Recycled Ionic Liquid [mmim][dmp] and Combination with Alkaline

Sangian

Kristian

Rahma

et al. 2014

Bull. Chem. React. Eng. Catal.

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“…This effect can be clearly observed in Figure 1, where increased pretreatment temperature during autohydrolysis enhanced glucose release during enzymatic hydrolysis but xylose concentration was reduced because some amount of xylan had already been removed during autohydrolysis [19]. Reduction in xylose concentration at 205 • C can be attributed to the removal of some hemicellulose content during high temperature autohydrolysis, while low xylose concentration at 110 • C might be due to more lignin hindrance [19,22]. Many studies have confirmed the same effect of high-temperature autohydrolysis on the reduction of hemicellulose content [21,23].…”

Section: Discussionmentioning

confidence: 94%

“…However, it is very important to optimize both ionic liquid pretreatment and fermentation conditions for this ethanol-producing MZ-4 strain in order to further enhance yields and make the process less expensive. Moreover, previous studies have reported that the formation of inhibitors is limited in ionic liquid (IL) pretreatments, but the remnants of ILs in pretreated materials can adversely affect the enzymes and microorganisms [22,26]. Therefore, further studies are required to examine the impact of C 4 mimOAc remaining on fermentation, especially under low-process water consumption.…”

Section: Discussionmentioning

confidence: 99%

Enhanced Production of Bioethanol by Fermentation of Autohydrolyzed and C4mimOAc-Treated Sugarcane Bagasse Employing Various Yeast Strains

et al. 2017

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Abstract:This study examines the fermentation of autohydrolyzed and 1-n-butyl-3-methylimidazolium acetate (C 4 mimOAc) pretreated sugarcane bagasse, using four different yeast strains to determine the efficiency of bioethanol production. Three strains of Saccharomyces cerevisiae (S. cerevisiae) and one of Scheffersomyces stipitis (S. stipitis) were employed in this study. It was observed that the sugarcane bagasse autohydrolyzed at 205 • C for 6 min with subsequent enzymatic hydrolysis exhibited the maximum ethanol yield of 70.92 ± 0.09 mg/g-substrate when S. cerevisiae MZ-4 was used. However, a slightly higher ethanol yield of 78.78 ± 0.94 mg/g-substrate was obtained from C 4 mimOAc pretreated bagasse employing S. cerevisiae MZ-4. The study showed that the newly isolated MZ-4 strain exhibited better ethanol yield as compared to commercially available yeast strains S. cerevisiae Uvaferm-43, S. cerevisiae Lalvin EC-1118, and S. stipitis.

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“…The increase in the crystalline index of substrate pretreated with NaOH was mainly caused by the liquefaction of the amorphous parts (lignin and hemicellulose). After pretreatment with NaOH+IL, the peak (002) decreased significantly, and the (101) plane almost disappeared, corresponding to the transformation of the material from cellulose I to cellulose II, which has an amorphous structure [18,24,25]. The compositions of cellulose, hemicellulose, and lignin in coconut coir dust were analyzed using the method recommended by Datta and Rathin [17].…”

Section: Characterization Of Pretreated Coconut Coir Dustmentioning

confidence: 99%

Comparative Study of the Preparation of Reducing Sugars Hydrolyzed from High-Lignin Lignocellulose Pretreated with Ionic Liquid, Alkaline Solution and Their Combination

et al. 2015

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Abstract. The ionic liquid [MMIM][DMP] was synthesized from the reactants methyl imidazole [MIM] and trimethylphosphate [TMP] and verified using 1 HNMR and FTIR. Coconut coir dust was pretreated with a 1% alkaline solution. Its crystalline structure increased significantly due to the dissolution of lignin and hemicelluloses under alkaline conditions, exposing the cellulose. After NaOH and IL were employed, the XRD showed that peak (002) decreased significantly and peak (101) almost vanished. This significant decrease in crystallinity was related to the alteration of the substrate from the cellulose I structure to the cellulose II structure. The pretreated substrates were hydrolyzed to convert them to reducing sugars by pure cellulase and xylanase, and the reaction was conducted at 60°C, pH 3, for 12 or 48 hours. The yields of sugar hydrolyzed from untreated and NaOH-pretreated substrates were 0.07 and 0.12 g sugar/g lignocellulose, respectively. Pretreatment with IL or the combination of NaOH+IL resulted in yields of reducing sugars of 0.11 and 0.13 g/g, respectively. These findings showed that IL pretreatment of the high-lignin lignocellulose is a new prospect for the economical manufacture of reducing sugars and bioethanol in the coming years.

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Effect of ionic liquid pretreatment on the chemical composition, structure and enzymatic hydrolysis of energy cane bagasse

Cited by 218 publications

References 33 publications

Preparation of Reducing Sugar Hydrolyzed from High-Lignin Coconut Coir Dust Pretreated by the Recycled Ionic Liquid [mmim][dmp] and Combination with Alkaline

Preparation of Reducing Sugar Hydrolyzed from High-Lignin Coconut Coir Dust Pretreated by the Recycled Ionic Liquid [mmim][dmp] and Combination with Alkaline

Enhanced Production of Bioethanol by Fermentation of Autohydrolyzed and C4mimOAc-Treated Sugarcane Bagasse Employing Various Yeast Strains

Comparative Study of the Preparation of Reducing Sugars Hydrolyzed from High-Lignin Lignocellulose Pretreated with Ionic Liquid, Alkaline Solution and Their Combination

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