The correlation between cellulose allomorphs (I and II) and conversion after removal of hemicellulose and lignin of lignocellulose

Song, Ying; Zhang, Jingzhi; Zhang, Xu; Tan, Tianwei

doi:10.1016/j.biortech.2015.06.084

Cited by 54 publications

(33 citation statements)

References 28 publications

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“…The presence of crystalline cellulose is confirmed by the three following signals at 1456 cm -1 27,37,39,42 , 1372 cm - 1 19,22,42-44 and 1314 cm - 1 19,22,27,37-41,44 (bending mode vibration of C-H), while the amorphous content is justified by the presence of centered peak at 1425 cm -1 corresponding to CH 2 bending vibration (scissoring) 16,19,27,39,40,43 . According to Song et al 2015 42 and Zghari et al 2018 37 the crystalline cellulose I and cellulose II appear as doublet peak at 1430 cm -1 (strong band) and at 1420 cm -1 (weak band), respectively 44 . Furthermore, Hajji et al 2015 19 and Broda et al 2019 41 report that the decline in the intensities of the two bands at 1314 and 1163 cm -1 is correlated to the decrease of cellulose crystallinity (cellulose I).…”

Section: Ftir Spectroscopymentioning

confidence: 95%

“…Concerning the band at 899 cm -1 ascribed to C-O-C stretching vibration mode of cellulose -(1-4)-glycosidic linkage is related to the content of amorphous cellulose which is completely in accordance with published literature studies 16,19,22,38,39,43 . However, this band is sensitive to changes, and so, a portion of amorphous cellulose content underwent crystallization due to mechanochemical processes 22 and/or to natural environmental degradation conditions 37,42,44 , that is why it is subject of many controversies data 22,37,42,44 . A clear indications have been reported by Song et al 2015 42 which attributed the weak and broad absorption band to cellulose I, while the strong and sharp one might be assigned to cellulose II and amorphous cellulose.…”

Section: Ftir Spectroscopymentioning

confidence: 99%

“…However, this band is sensitive to changes, and so, a portion of amorphous cellulose content underwent crystallization due to mechanochemical processes 22 and/or to natural environmental degradation conditions 37,42,44 , that is why it is subject of many controversies data 22,37,42,44 . A clear indications have been reported by Song et al 2015 42 which attributed the weak and broad absorption band to cellulose I, while the strong and sharp one might be assigned to cellulose II and amorphous cellulose. The similar finding was confirmed by Hajji et al 2016 44 and Zghari et al 2018 37 which reported that the ageing process promote the breakage of the C-O-C bonds of crystalline cellulose I in the -(1-4)-glycosidic linkage.…”

Section: Ftir Spectroscopymentioning

confidence: 99%

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The effect of the natural degradation process on the cellulose structure of Moroccan hardwood fiber: a survey on spectroscopy and structural properties

Boukir¹,

Mehyaoui²,

Fellak³

et al. 2019

Mediterr.J.Chem.,

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The aim of this work is to study the effect of natural degradation on the cellulose structure conformation changes of 2 ageing Moroccan hardwoods (400 and 500 years) compared to recent one considered as a reference; and to provide information on the polymorphs content variability from two-phases material (crystalline and amorphous) influenced by a long time of ageing and environmental degradation effects. In order to investigate the effects of both natural degradation conditions and a long time of exposure on cellulose structure conformation (examined samples) with estimating their content (crystalline and amorphous cellulose), three combined techniques XRD, ATR-FTIR and FT-Raman spectroscopy were used. XRD results associated with the crystallographic planes and Miller indices provide information on the presence of a mixture of cellulose polymorphs (crystalline cellulose I, II, I  and amorphous phase). The decrease in crystallinity-index values from recent to aged ones (38 to 19.5%) confirms well the occurred alteration of crystalline cellulose fibres and their evolution towards a high content of the amorphous form. The prominent regression in the intensities of three FTIR fingerprint cellulose regions evolving towards an overall increase in the intensities of C=O area (1733-1630 cm-1) is a sign on the introduced changes on cellulose conformation and cellulose fibres degradation more accentuated in the case of the very aged sample (500 years). Similar results were confirmed by combining FT-Raman spectroscopy as a vibrational technique. No work has been done on this genus of degraded Moroccan hardwood and the relevance of this study is to investigate the compositional content and structural conformation, to determine the variability in the forms of both crystalline and amorphous cellulose phases with estimating the evolution of their polymorphism, and to monitor the degree of crystalline cellulose fibres deterioration.

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Section: Ftir Spectroscopymentioning

confidence: 95%

Section: Ftir Spectroscopymentioning

confidence: 99%

Section: Ftir Spectroscopymentioning

confidence: 99%

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The effect of the natural degradation process on the cellulose structure of Moroccan hardwood fiber: a survey on spectroscopy and structural properties

Boukir¹,

Mehyaoui²,

Fellak³

et al. 2019

Mediterr.J.Chem.,

View full text Add to dashboard Cite

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“…The increased accessibility for enzymes seems to be strongly related to the cellulose structure that is the arrangement of cellulose chains in the cell wall and the cellulose crystallinity. In fact, cellulose can be transformed from natural cellulose I to the thermodynamically more stable cellulose II (Kontturi 2006;Song et al 2015). In particular alkaline conditions eventually lead to the rearrangement of neighboring cellulose fibers with different orientation to form cellulose II.…”

Section: Introductionmentioning

confidence: 99%

In operando monitoring of wood transformation during pretreatment with ionic liquids

et al. 2020

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The conversion of lignocellulosic biomass or wood into chemicals still poses a challenge due to the recalcitrance of this composite-like material consisting of lignin, hemicellulose and cellulose. A very high accessibility of cellulose is reported by a pretreatment with ionic liquids that enables high conversion rates by enzymatic hydrolysis. However, the underlying mechanisms have not yet been monitored in operando nor are they fully understood. We monitored the transformation of wood in ionic liquids using small-angle neutron scattering to observe changes in the material in operando and to elucidate the intrinsic effects. The data analysis shows three different stages that is (1) impregnation, (2) the formation of voids and (3) increasing structure size within cellulose fibrils. This consecutive mechanism coincides with macroscopic disintegration of the tissue. The analysis further reveals that the reduction of order in longitudinal direction along the fiber axis is a prerequisite for disintegration of cells along the radial direction. This understanding supports further research and development of pretreatment processes starting from lignocellulosic raw material.

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“…Lignin fills the voids between carbohydrates in the plant cell wall, which creates highly natural biomass recalcitrance that reduces their accessibility to carbohydrate-modifying enzymes. Lignin content is the key factor that is negatively correlated with enzyme digestibility and sugar release (Song et al 2015;Yu et al 2015;Raut et al 2016). With less than 20% lignin content in Populus, the sugar yield increases significantly for enzymatic hydrolysis even without pretreatment (Studer et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Topochemical Correlation between Carbohydrates and Lignin in Eucommia ulmoides Cell Wall from Tissue to Cell Level

et al. 2016

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The efficient conversion of biomass into biofuels is closely associated with the topochemistry of the cell wall. In this study, the topochemical correlation between carbohydrates and lignin in the Eucommia ulmoides cell wall was investigated in situ by confocal Raman microscopy. The carbohydrates and lignin were mainly collocated in the secondary wall of the fiber, ray parenchyma, and vessel in E. ulmoides. High carbohydrates were associated with low lignin or vice versa, indicating that a high concentration of carbohydrates leads to a drop in the degree of lignification. Furthermore, the band intensity ratio of S-and G-lignin to carbohydrates (I1333/I2889 and I1274/I2889) in morphologically distinct regions of fiber was calculated. In accordance with the wet chemical analysis, a higher ratio of lignin to carbohydrates was observed within the middle layer of the 3-year-old E. ulmoides fiber secondary wall. The results potentially extend the current understanding of the carbohydrate and lignin topochemistry in woody biomass and may facilitate an efficient wood bioconversion process in future biorefineries.

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The correlation between cellulose allomorphs (I and II) and conversion after removal of hemicellulose and lignin of lignocellulose

Cited by 54 publications

References 28 publications

The effect of the natural degradation process on the cellulose structure of Moroccan hardwood fiber: a survey on spectroscopy and structural properties

The effect of the natural degradation process on the cellulose structure of Moroccan hardwood fiber: a survey on spectroscopy and structural properties

In operando monitoring of wood transformation during pretreatment with ionic liquids

Topochemical Correlation between Carbohydrates and Lignin in Eucommia ulmoides Cell Wall from Tissue to Cell Level

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