PEG-functionalized ionic liquids for cellulose dissolution and saccharification

Tang, Shaokun; Baker, Gary A.; Ravula, Sudhir; Jones, J. J.; Zhao, Hua

doi:10.1039/c2gc35631g

Cited by 119 publications

(82 citation statements)

References 84 publications

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“…This elucidates that ORGL samples are amorphous in nature (Sarkanen, 1963). Moreover, absence of any intense peak at 22.1°in all the ORGL samples also established that in these samples cellulose is not present (Tang et al, 2012) and thus it suggests that during isolation procedures lignin is selectively isolated from lignocellulosic materials (Wu et al, 2010). On the contrary, presence of peaks at 2h of 16.6°and 22.1°in all the pulp samples again proves that cellulose is not extracted along with lignin.…”

Section: Resultsmentioning

confidence: 71%

Isolation of lignin by organosolv process from different varieties of rice husk: Understanding their physical and chemical properties

Singh

Dhepe

2016

Bioresource Technology

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Section: Resultsmentioning

confidence: 71%

Isolation of lignin by organosolv process from different varieties of rice husk: Understanding their physical and chemical properties

Singh

Dhepe

2016

Bioresource Technology

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“…Cellulose can exist in many polymorphs (Cellulose I, II, III and IV with additional sub-classifications) due to the hydroxyl groups within the structure being involved either in intra- or intermolecular hydrogen bonding which results in a different arrangement of atoms throughout the structure [33]. Both samples contained cellulose I β (monoclinic) with a primary peak at 2 θ ~22.5° corresponding to the (002) plane; and, a secondary broad peak (2 θ ~16.0°) corresponding to the overlap of the (101) and (10) planes [34, 35]. The reflection at 2 θ ~34.7° was attributed to the (040) plane.…”

Section: Resultsmentioning

confidence: 99%

Isolation of a wide range of minerals from a thermally treated plant: Equisetum arvense, a Mare’s tale

et al. 2016

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Silica is the second most abundant biomineral being exceeded in nature only by biogenic CaCO3. Many land plants (such as rice, cereals, cucumber, etc.) deposit silica in significant amounts to reinforce their tissues and as a systematic response to pathogen attack. One of the most ancient species of living vascular plants, Equisetum arvense is also able to take up and accumulate silica in all parts of the plant. Numerous methods have been developed for elimination of the organic material and/or metal ions present in plant material to isolate biogenic silica. However, depending on the chemical and/or physical treatment applied to branch or stem from Equisetum arvense; other mineral forms such glass-type materials (i.e. CaSiO3), salts (i.e. KCl) or luminescent materials can also be isolated from the plant material. In the current contribution, we show the chemical and/or thermal routes that lead to the formation of a number of different mineral types in addition to biogenic silica.Electronic supplementary materialThe online version of this article (doi:10.1007/s00775-015-1320-0) contains supplementary material, which is available to authorized users.

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“…The changes in cellulose crystallinity correlate nicely with the enzymatic hydrolysis rate of cellulose (Table 1). Earlier studies 10, 40 showed that cellulosic regeneration from an IL is often accompanied by a change in structure from cellulose I to cellulose II. Representative SEM images further corroborate that the morphology of untreated cellulose (Fig 5a) is more heterogeneous consisting of large particles, while the regenerated cellulose (Fig 5b) appears to be more homogeneous and uniform; celluloses treated by aqueous [BMIM][OAc] (1.0 and 2.0 M) (Fig.…”

Section: Resultsmentioning

confidence: 99%

Aqueous ionic liquids and deep eutectic solvents for cellulosic biomass pretreatment and saccharification

et al. 2014

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Ionic liquids (ILs) have proven effective solvents for pretreating lignocellulose, leading to the fast saccharification of cellulose and hemicellulose. However, the high current cost of most ILs remains a major barrier to commercializing this recent approach at a practical scale. As a strategic detour, aqueous solutions of ILs are also being explored as less costly alternatives to neat ILs for cellulose pretreatment. However, limited studies on a few select IL systems are known and there remains no systematic survey of various ILs, eluding an in-depth understanding of pretreatment mechanisms afforded by aqueous IL systems. As a step toward filling this gap, this study presents results for Avicel cellulose pretreatment by neat and aqueous solutions (1.0 and 2.0 M) of 20 different ILs and three deep eutectic solvents, correlating enzymatic hydrolysis rates of pretreated cellulose with various IL properties such as hydrogen-bond basicity, polarity, Hofmeister ranking, and hydrophobicity. The pretreatment efficiencies of neat ILs may be loosely correlated to the hydrogen-bond basicity of the constituent anion and IL polarity; however, the pretreatment efficacies for aqueous ILs are more complicated and cannot be simply related to any single IL property. Several aqueous IL systems have been identified as effective alternatives to neat ILs in lignocellulose pretreatment. In particular, this study reveals that aqueous solutions of 1-butyl-3-methylimidazolium methanesulfonate ([BMIM][MeSO3]) are effective for pretreating switchgrass (Panicum virgatum), resulting in fast saccharification of both cellulose and hemicellulose. An integrated analysis afforded by X-ray diffraction, scanning electron microscopy, thermogravimetric analysis and cellulase adsorption isotherm of lignocellulose samples is further used to deliver a more complete view of the structural changes attending aqueous IL pretreatment.

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PEG-functionalized ionic liquids for cellulose dissolution and saccharification

Cited by 119 publications

References 84 publications

Isolation of lignin by organosolv process from different varieties of rice husk: Understanding their physical and chemical properties

Isolation of lignin by organosolv process from different varieties of rice husk: Understanding their physical and chemical properties

Isolation of a wide range of minerals from a thermally treated plant: Equisetum arvense, a Mare’s tale

Aqueous ionic liquids and deep eutectic solvents for cellulosic biomass pretreatment and saccharification

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