Characteristics of Lignin Fractions from Dilute Acid Pretreated Switchgrass and Their Effect on Cellobiohydrolase from Trichoderma longibrachiatum

Yao, Lan; Hu, Yang; Yoo, Chang Geun; Meng, Xianzhi; Pu, Yunqiao; Hao, Naijia; Ragauskas, Arthur J.

doi:10.3389/fenrg.2018.00001

Cited by 43 publications

(9 citation statements)

References 46 publications

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“…According to the results of the aforementioned characteristics of lignins and their inhibition on enzymatic hydrolysis, the lignin fractions comprising of more S units resulted in a higher inhibitory impact on cellulase performance (y = -0.14x + 48.55, R² = 0.63), which was consistent with previous study with gramineous crops (Yao et al 2018b). The negative effect of the amount of lignin inter-unit linkages (including β-O-4 and β-5) (y = -0.39x + 43.69, R² = 0.91) or the β-O-4 (y = -0.40x + 43.58, R² = 0.88) in lignin fraction on glucose yield from pretreated MCC was also observed.…”

Section: Relationships Between Structural Properties Of Lignin and Itsupporting

confidence: 91%

Physico-chemical properties of lignin fractions from acid pretreated corn stover and their effects on enzymatic hydrolysis of microcrystalline cellulose

Zhang

Yoo

et al. 2020

BioRes

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Lignin has been shown to be a recalcitrance factor in many biomass conversion studies. To better understand the effects of lignin on cellulose conversion, different lignin fractions were extracted from the same dilute acid pretreated corn stover by three sequential isolation methods, namely ethanol extraction, dioxane extraction, and enzyme purification. The physicochemical properties of each lignin fraction including molecular weight distribution, surface area, surface charge, and other structural features varied, depending on the isolation methods. All three lignin fractions had negative surface charges, and ethanol-extracted lignin carried the highest surface charges, followed by dioxane-extracted lignin and cellulase-purified residual lignin. These physicochemical properties of lignin fractions also resulted in different extent of inhibitory effects on enzymatic hydrolysis of microcrystalline cellulose (MCC). Dioxane-extracted lignin exhibited the highest inhibitory effect on glucose release from MCC, followed by the cellulase-purified residual lignin fraction and ethanol-extracted lignin. Furthermore, lignin fractions with higher contents of syringyl (S) substructure and β-O-4 aryl ether interunit linkages showed a stronger negative effect on cellulase hydrolysis of MCC.

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Section: Relationships Between Structural Properties Of Lignin and Itsupporting

confidence: 91%

Physico-chemical properties of lignin fractions from acid pretreated corn stover and their effects on enzymatic hydrolysis of microcrystalline cellulose

Zhang

Yoo

et al. 2020

BioRes

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“…Previous studies report various degrees of success in improving hysteresis, reproducibility, and stability 5–15 , however, these issues remain to be fully resolved. From a materials point of view, these issues arise from diverse morphological and compositional variations of halide perovskite materials 6,16–19 , crystallization kinetics of halide perovskite grains 5,16,18–21 , various defects and/or remnant of precursors 16–20 , and internal redistribution of ionic species within halide perovskite layers 6,16–19 . Additionally, inorganic materials that are used in conjunction with halide perovskite layers for charge transport and extraction can result in extra interface defects 5,22,23 .…”

Section: Introductionmentioning

confidence: 99%

Light Intensity-dependent Variation in Defect Contributions to Charge Transport and Recombination in a Planar MAPbI3 Perovskite Solar Cell

Ryu

Nguyen

et al. 2019

Sci Rep

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We investigated operation of a planar MAPbI3 solar cell with respect to intensity variation ranging from 0.01 to 1 sun. Measured J-V curves consisted of space-charge-limited currents (SCLC) in a drift-dominant range and diode-like currents in a diffusion-dominant range. The variation of power-law exponent of SCLC showed that charge trapping by defects diminished as intensity increased, and that drift currents became eventually almost ohmic. Diode-like currents were analysed using a modified Shockley-equation model, the validity of which was confirmed by comparing measured and estimated open-circuit voltages. Intensity dependence of ideality factor led us to the conclusion that there were two other types of defects that contributed mostly as recombination centers. At low intensities, monomolecular recombination occurred due to one of these defects in addition to bimolecular recombination to result in the ideality factor of ~1.7. However, at high intensities, another type of defect not only took over monomolecular recombination, but also dominated bimolecular recombination to result in the ideality factor of ~2.0. These ideality-factor values were consistent with those representing the intensity dependence of loss-current ratio estimated by using a constant internal-quantum-efficiency approximation. The presence of multiple types of defects was corroborated by findings from equivalent-circuit analysis of impedance spectra.

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“…In this acid catalysis process, acid can simultaneously promote both de-and re-polymerization. High hydrogen ion concentration might significantly condensate the liquefied phenolic product (Yao et al, 2018). In this work, the acid dissociation constant (pKa) in water consulted acidity comparison in AL liquefaction.…”

Section: Effects Of Acids On Alkali Lignin Conversionmentioning

confidence: 99%

Oligomeric Aromatic Oxides (OAO) Production From Sugarcane Bagasse Lignin by Acid-Catalyzed Solvothermal Liquefaction in Methanol

Cheng

Yang

et al. 2020

Front. Energy Res.

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Extracted alkali lignin (AL) and organosolv lignin (OL) from sugarcane bagasse were acid-catalyzed liquefied in methanol with the aim of producing oligomeric aromatic oxides. Acids were screened for their effects on the output of oligomeric aromatic oxides from alkali lignin liquefaction. Based on the highest amount of lignin conversion, the order of catalytic efficiency was: p-toluenesulfonic acid (TsOH) > CCl3COOH (TCA) > KHSO4 > AlCl3 > H3O40PW12 > H2SO4. The most alkali lignin conversion was 86.2 wt% when catalyzed by p-toluenesulfonic acid. Optimized liquefaction temperatures indicated that AL liquefaction optimum temperature was 250°C and OL was 175°C. GPC characterized AL, OL and resultant products implied that TsOH could degrade both lignins to about 780 g/mol of molecular weight. HSQC-NMR and GC-MS observations suggested that simultaneous vinyl ether cleavage and intermediate stabilization of phenolic hydroxyl group etherification at high temperatures achieved AL liquefaction. Acidolysis of β-ether linkages at mild temperatures was the mechanism of OL liquefaction.

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Characteristics of Lignin Fractions from Dilute Acid Pretreated Switchgrass and Their Effect on Cellobiohydrolase from Trichoderma longibrachiatum

Cited by 43 publications

References 46 publications

Physico-chemical properties of lignin fractions from acid pretreated corn stover and their effects on enzymatic hydrolysis of microcrystalline cellulose

Physico-chemical properties of lignin fractions from acid pretreated corn stover and their effects on enzymatic hydrolysis of microcrystalline cellulose

Light Intensity-dependent Variation in Defect Contributions to Charge Transport and Recombination in a Planar MAPbI3 Perovskite Solar Cell

Oligomeric Aromatic Oxides (OAO) Production From Sugarcane Bagasse Lignin by Acid-Catalyzed Solvothermal Liquefaction in Methanol

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