Structure of Regenerated Celluloses Treated with Ionic Liquids and Comparison of their Enzymatic Digestibility by Purified Cellulase Components

2012 ◽  
Vol 65 (11) ◽  
pp. 1491 ◽  
Author(s):  
Masahiro Mizuno ◽  
Shuji Kachi ◽  
Eiji Togawa ◽  
Noriko Hayashi ◽  
Kouichi Nozaki ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Crystal Form ◽  
Regenerated Cellulose ◽  
Cellulose Ii ◽  
Cellulose I ◽  
Acid Moiety ◽  
Amino Acid Moiety ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of ◽  
Disordered Chain

In this study, regenerated celluloses were prepared from microcrystalline cellulose (MCC) by treatment with three ionic liquids (ILs) having 1-ethyl-3-methylimidazolium (Emim) as the cation, and the IL N-(2-methoxyethyl)-N,N-diethyl-N-methylammonium alanine ([N221ME][Ala]), where the amino acid moiety is the anion. The crystal form of cellulose was transformed from cellulose I to cellulose II by dissolution with an IL and regeneration with anti-solvent. However, the crystallinity of the regenerated cellulose was different; the disordered chain region was increased in the order of [N221ME][Ala] < [Emim][OAc] < [Emim][DEP] < [Emim][Cl]. The monocomponent cellulase, especially endoglucanase, showed high hydrolyzing activity for regenerated cellulose compared with untreated cellulose. Furthermore, the degree of increase of hydrolyzing activity was almost coincident with the order of crystallinity. For the effective hydrolysis of cellulose treated with an IL, it is necessary to prepare the cellulase mixture containing an adequate ratio of each cellulase component according to crystal allomorph and the crystallinity of regenerated cellulose.

Supramolecular Structure Characterization of Cellulose II Nanowhiskers Produced by Acid Hydrolysis of Cellulose I Substrates

2012 ◽  
Vol 13 (2) ◽  
pp. 570-578 ◽  
Author(s):  
Gilles Sèbe ◽  
Frédérique Ham-Pichavant ◽  
Emmanuel Ibarboure ◽  
Akissi Lydie Chantal Koffi ◽  
Philippe Tingaut
Keyword(s):  
Acid Hydrolysis ◽  
Supramolecular Structure ◽  
Structure Characterization ◽  
Cellulose Ii ◽  
Cellulose I ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of

SO3H-functionalized acidic ionic liquids as catalysts for the hydrolysis of cellulose

2013 ◽  
Vol 92 (1) ◽  
pp. 218-222 ◽  
Author(s):  
Yuanyuan Liu ◽  
Wenwen Xiao ◽  
Shuqian Xia ◽  
Peisheng Ma
Keyword(s):  
Ionic Liquids ◽  
Acidic Ionic Liquids ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of

scholarly journals Importance of Hydrolysis of Amino Acid Moiety in Water-Soluble Prodrugs of Disodium Cromoglycate for Increased Oral Bioavailability.

1992 ◽  
Vol 15 (7) ◽  
pp. 339-345 ◽  
Author(s):  
Akihisa YOSHIMI ◽  
Hiroyuki HASHIZUME ◽  
Satoshi TAMAKI ◽  
Hirokazu TSUDA ◽  
Fumio FUKATA ◽  
...  
Keyword(s):  
Amino Acid ◽  
Oral Bioavailability ◽  
Water Soluble ◽  
Disodium Cromoglycate ◽  
Acid Moiety ◽  
Amino Acid Moiety ◽  
Hydrolysis Of

Cellulose Hydrolysis by Acidic Ionic Liquids Enhanced with Microwave Heating

2018 ◽  
Vol 1145 ◽  
pp. 75-79 ◽  
Author(s):  
Hai Yun Ma ◽  
Zhi Ping Zhao ◽  
Peng Lu
Keyword(s):  
Ionic Liquids ◽  
Microwave Heating ◽  
Reducing Sugars ◽  
Cellulose Hydrolysis ◽  
Degree Of Polymerization ◽  
Deionized Water ◽  
Acidic Ionic Liquids ◽  
Hydrolysis Of Cellulose ◽  
Total Reducing Sugars ◽  
Hydrolysis Of

The hydrolysis of cellulose into platform compounds and chemicals fuels has gained much attention to relieve the global energy crisis and environmental pollution. The filter paper (FP) cellulose with average degree of polymerization (DP) of 1000-1300 was dissolved in 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) firstly. And then acidic ionic liquids (ILs), ([(CH2)3SO3HVIm]HSO4) as the catalyst was applied to hydrolyze the FP cellulose by microwave heating. Compared with the oil bath heating method, microwave heating could effectively increase the total reducing sugars (TRS) yield about 10.7%. When the ratio of ILs catalyst to FP (w/w) was 0.167, and the ratio of deionized water to FP (w/w) was 0.833, the TRS yield was up to 60.8% within 20 min at 100°C.

scholarly journals Dissolution and recovery of cellulose from pine wood bits in ionic liquids and a co-solvent component mixed system

2019 ◽  
Vol 14 ◽  
pp. 155892501983844 ◽  
Author(s):  
Ran Liu ◽  
Juan Zhang ◽  
Shuang Sun ◽  
Yuhang Bian ◽  
Yanhui Hu
Keyword(s):  
Ionic Liquids ◽  
Degree Of Polymerization ◽  
Mixed System ◽  
Regenerated Cellulose ◽  
Gravimetric Analysis ◽  
Cellulose I ◽  
Pine Wood ◽  
Good Thermal Stability ◽  
Component Solution ◽  
Solvent Component

The dissolution and recovery of cellulose from pine wood bits with two types of ionic liquids and co-solvents were explored. The results revealed that 1-ethyl-3-methylimidazolium diethylphosphonate ionic liquid/dimethylsulfoxide (mass ratio 1:0.5) could dissolve pine cellulose within 8 min at 105°C. Moreover, the degree of polymerization of the regenerated cellulose reached 244. The dissolved cellulose could be regenerated from the component solution when water was added. Then, the regenerated cellulose was characterized by X-ray powder diffraction, Fourier-transform infrared spectroscopy, and thermal gravimetric analysis measurements. The results revealed that there was no derivatization of the reaction in the process of dissolution and that dissolving the pine cellulose was a direct process. The crystalline structure of the cellulose was converted from cellulose I to cellulose II after regeneration. The regenerated cellulose was also found to have good thermal stability.

scholarly journals Enzymatic Hydrolysis of Cellulose after Pretreated by Ionic Liquids: Focus on One-pot Process

2012 ◽  
Vol 14 ◽  
pp. 1741-1747 ◽  
Author(s):  
Suli Zhi ◽  
Yanli Liu ◽  
Xiaoyan Yu ◽  
Xinying Wang ◽  
Xuebin Lu
Keyword(s):  
Ionic Liquids ◽  
Enzymatic Hydrolysis ◽  
One Pot ◽  
Enzymatic Hydrolysis Of Cellulose ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of
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