Characterization of lignin during oxidative and hydrothermal pre-treatment processes of wheat straw and corn stover

Kaparaju, Prasad; Felby, Claus

doi:10.1016/j.biortech.2009.12.008

Cited by 147 publications

(73 citation statements)

References 19 publications

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“…They thought that thermochemical pretreatments reaching temperatures above the range for lignin phase transition cause lignins to coalesce into larger molten bodies that migrate within and out of the cell wall, and can redeposit on the surface of plant cell walls. Therefore, the lignin droplets observed when the corncobs were exposed to hydrothermal pretreatment at high temperature were in accordance with the observations of other reports (Donohoe et al 2008;Kaparaju and Felby 2010;Kristensen et al 2008;Xiao et al 2011).…”

Section: Morphological Structure Of Corncobssupporting

confidence: 92%

Hydrothermal Treatment and Enzymatic Saccharification of Corncobs

Sun¹,

Yang²,

Yang³

et al. 2014

BioResources

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Hydrothermal pretreatment of corncobs in aqueous media under nonisothermal conditions is an effective means for solubilizing hemicellulose fractions and improving cellulose hydrolysis. The effects of a range of pretreatment severities (temperatures of 170 to 230 °C) on the conversion of corncobs into fermentable sugars were examined. The major differences between the conversions of untreated and pretreated corncobs were the dissolution of hemicelluloses into the prehydrolyzate and the partial removal and relocation of lignin on the external surface of biomass particles (in the form of recondensed droplets) in the pretreated corncobs. Hemicellulose dissolution increased with pretreatment temperature. The maximum sugar recovery (272.3 g/kg raw material) and the minimum accumulation of inhibitory compounds in the prehydrolyzate were observed following treatment at 190 °C. While the fibrils of the untreated raw material remained largely intact, serious disruption of the cell wall was observed in SEM images of the surfaces of pretreated samples. Accordingly, the cellulose digestibilities of residues increased from 26.8% for the raw material to almost 100% for the 190 °C-treated sample. It was concluded that low severity hydrothermal pretreatment can be successfully applied to corncobs to obtain high cellulose digestibility while operating at low enzyme charges.

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Section: Morphological Structure Of Corncobssupporting

confidence: 92%

Hydrothermal Treatment and Enzymatic Saccharification of Corncobs

Sun¹,

Yang²,

Yang³

et al. 2014

BioResources

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“…The characterization and application of lignin from second generation of bioethanol plants (Kristensen et al 2008;Kaparaju and Felby 2010;Hansen et al 2013;Yelle et al 2013) have revealed that there is a strong interaction between lignin and silica, which is not yet fully understood, and which has an impact on lignin structure, properties, and applications. For understanding the association between silica and lignin, the structureproperty relationships have to be elucidated, which may enable a better control concerning the lignin properties for specific applications.…”

Section: Introductionmentioning

confidence: 99%

Solid-state ²⁹Si NMR and FTIR analyses of lignin-silica coprecipitates

Cabrera

Larsen

et al. 2016

Holzforschung

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When agricultural residues are processed to ethanol, lignin and silica are some of the main byproducts. Separation of these two products is difficult and the chemical interactions between lignin and silica are not well described. In the present study, the effect of lignin-silica complexing has been investigated by characterizing lignin and silica coprecipitates by FTIR and solid state NMR. Silica particles were coprecipitated with three different lignins, three lignin model compounds, and two silanes representing silica-inlignin model compounds. Comparison of 29 Si SP/MAS NMR spectra revealed differences in the distribution of silanol hydroxyl groups among different coprecipitates. These differences are dependent on the lignin type. The results are interpreted that the underlying mechanism of the interactions is the formation of hydrogen bonds between lignin aliphatic hydroxyl or carboxyl groups and the silanols, but not a condensation of the silica-inlignin among the silica particles and not the formation of C-O-Si bonds.

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“…For good anaerobic co-digestion condition, it proved that the ratio should be in a reasonable range of 1/5 to 1/10 as the result of this research. cumulative biogas production ml biogas yield ml/g·VS part A biogas yield cumulative biogas production lignin contents [9]. As the substrate of anaerobic digestion, the corn straws might need to be pretreated using some pretreatment processes such as adding enzyme and fungicide to improve the utilization rate of cellulose [10].…”

Section: Resultsmentioning

confidence: 99%