Fast dissolution pretreatment of the corn stover in gamma-valerolactone promoted by ionic liquids: Selective delignification and enhanced enzymatic saccharification

Jin, Longming; Yu, Xuebin; Peng, Chang; Guo, Yuanlong; Zhang, Lihua; Xu, Qin; Zhao, Zongbao K.; Liu, Yu; Xie, Haibo

doi:10.1016/j.biortech.2018.09.083

Cited by 40 publications

(21 citation statements)

References 45 publications

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“…XRD spectra of regenerated cellulose films and raw cellulose specimens were recorded on a X’pert Pro-1 diffractometer equipped with a Cu Kα radiation source (λ = 1.54 Å), operated at 40 kV and 40 mA. Scans were collected from 2 θ = 5–75° with a step size of 0.016° and a scan speed of 0.208°/s [26,27]. The cellulose crystallinity index (CrI) was estimated according to the following empirical Equation (1) [28]:CrI=[It −Ia]It, where I t is the total intensity of the (2 0 0) peak for cellulose I 2θat22.7° and of the (0 2 0) peak for cellulose II 2θat 21.7°, and I a is the amorphous intensity 2θat 18° for cellulose I and 2θat 16° forcellulose II.…”

Section: Methodsmentioning

confidence: 99%

Preparation of Cellulose Films from Sustainable CO2/DBU/DMSO System

Jin

Gan

et al. 2019

Polymers

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Cellulose films are regarded as sustainable materials having wide applications in food packaging, separation, etc. Their preparation substantially relies on sufficient dissolution. Herein, various celluloses adequately dissolved in a new solvent system of carbon dioxide,1, 8-diazabicyclo [5.4.0] undec-7-ene and dimethyl sulfoxide (CO2/DBU/DMSO) were made in to films using different regeneration reagents. The films regenerated from ethanol and methanol presented homogeneous and smooth surfaces, while those from 5 wt % NaOH (aq.) and 5 wt % H2SO4 (aq.) showed rough surfaces, as analyzed using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The films regenerated from 5 wt % NaOH (aq.) and 5 wt % H2SO4 (aq.) rendered cellulose II structures, while those regenerated from alcohols had amorphous structures as evidenced using fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) results. The films made of microcrystalline cellulose had a good light transmittance of about 90% at 800 nm with a tensile strength of 55 MPa and an elongation break of 6.5%, while those from wood pulp cellulose demonstrated satisfactory flexibility with a tensile strength of 91 MPa and an elongation break of 9.0%. This research reports a simple, environmental, and sustainable method to prepare cellulose films of good mechanical properties.

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Section: Methodsmentioning

confidence: 99%

Preparation of Cellulose Films from Sustainable CO2/DBU/DMSO System

Jin

Gan

et al. 2019

Polymers

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“…A large variety of depolymerization or condensation reactions typically occur within the lignin structure under such conditions. Quantitative 31 P NMR analyses of lignins isolated from various biomass pretreatment technologies have been highlighted in recent studies 101,[108][109][110][111][112][113][114][115][116][117] . As lignin has become a key genetic engineering target for the enhancement of wood quality and biofuel production 118,119 , quantitative 31 P NMR analyses also have been carried out on transgenic lignin 97,120 .…”

Section: Applications Of the 31 P Nmr Protocolmentioning

confidence: 99%

Determination of hydroxyl groups in biorefinery resources via quantitative 31P NMR spectroscopy

et al. 2019

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The analysis of chemical structural characteristics of biorefinery product streams (such as lignin and tannin) has advanced substantially over the past decade, with traditional wet-chemical techniques being replaced or supplemented by NMR methodologies. Quantitative 31 P NMR spectroscopy is a promising technique for the analysis of hydroxyl groups because of its unique characterization capability and broad potential applicability across the biorefinery research community. This protocol describes procedures for (i) the preparation/solubilization of lignin and tannin, (ii) the phosphitylation of their hydroxyl groups, (iii) NMR acquisition details, and (iv) the ensuing data analyses and means to precisely calculate the content of the different types of hydroxyl groups. Compared with traditional wet-chemical techniques, the technique of quantitative 31 P NMR spectroscopy offers unique advantages in measuring hydroxyl groups in a single spectrum with high signal resolution. The method provides complete quantitative information about the hydroxyl groups with small amounts of sample (~30 mg) within a relatively short experimental time (~30-120 min).

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“…Being miscible with water, it induces better hydrolytic effects for biomass to dissolve out lignin [21]. It has also been applied under synergetic effects with metal salts, microwave, and with acids [22,23].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Lignin Extraction Variables by Response Surface Methodology from Pine Saw Dust, and Quantification of Major Structural Units in Isolated Lignin Fraction

2021

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A synergistic combination of dioxane, acetic acid, and HCl was investigated for lignin extraction from pine wood biomass. After initial screening of reagent combination, response surface methodology (RSM) was used to optimize the lignin yield with respect to the variables of time 24–72 h, solids loading 5–15%, and catalyst dose 5–15 mL. A quadratic model predicted 8.33% of the lignin yield, and it was further confirmed experimentally and through the analysis of variance (ANOVA). Lignin at optimum combination exhibited features in terms of derivatization followed by reductive cleavage (DFRC) with a value of (305 µmol/gm), average molecular weights of 4358 and polydispersity of 1.65, and 2D heteronuclear single quantum coherence nuclear magnetic resonance spectrum (2D-HSQC NMR) analysis showing relative β-O-4 linkages (37.80%). From here it can be suggested that this fractionation can be one option for high quality lignin extraction from lignocellulosic biomass.

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Fast dissolution pretreatment of the corn stover in gamma-valerolactone promoted by ionic liquids: Selective delignification and enhanced enzymatic saccharification

Cited by 40 publications

References 45 publications

Preparation of Cellulose Films from Sustainable CO2/DBU/DMSO System

Preparation of Cellulose Films from Sustainable CO2/DBU/DMSO System

Determination of hydroxyl groups in biorefinery resources via quantitative 31P NMR spectroscopy

Optimization of Lignin Extraction Variables by Response Surface Methodology from Pine Saw Dust, and Quantification of Major Structural Units in Isolated Lignin Fraction

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