Chemical and thermal properties of fractionated bagasse soda lignin

Mousavioun, Payam; Doherty, William O.S.

doi:10.1016/j.indcrop.2009.09.001

Cited by 195 publications

(106 citation statements)

References 12 publications

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“…4,5 In the case of sugarcane bagasse and other grasses, alkaline pretreatment also efficiently cleaves the esters of hydroxycinnamic acids attached to either lignin or hemicellulose hydroxyl groups. 8,37,38 As shown in the former results, mild CTM processes removed only part of the original lignin and hemicellulose. To test the hypothesis that plants with lower original lignin content would be suitable for these types of pretreatments, two additional samples were evaluated.…”

Section: Resultssupporting

confidence: 53%

Enzymatic hydrolysis of chemithermomechanically pretreated sugarcane bagasse and samples with reduced initial lignin content

Mendes

Siqueira

Carvalho

et al. 2011

Biotechnology Progress

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Chemithermomechanical (CTM) processing was used to pretreat sugarcane bagasse with the aim of increasing cell wall accessibility to hydrolytic enzymes. Yields of the pretreated samples were in the range of 75-94%. Disk refining and alkaline-CTM and alkaline/sulfite-CTM pretreatments yielded pretreated materials with 21.7, 17.8, and 15.3% of lignin, respectively. Hemicellulose content was also decreased to some extent. Fibers of the pretreated materials presented some external fibrillation, fiber curling, increased swelling, and high water retention capacity. Cellulose conversion of the alkaline-CTM- and alkaline/sulfite-CTM-pretreated samples reached 50 and 85%, respectively, after 96 h of enzymatic hydrolysis. Two samples with low initial lignin content were also evaluated after the mildest alkaline-CTM pretreatment. One sample was a partially delignified mill-processed bagasse. The other was a sugarcane hybrid selected in a breeding program. Samples with lower initial lignin content were hydrolyzed considerably faster in the first 24 h of enzymatic digestion. For example, enzymatic hydrolysis of the sample with the lowest initial lignin content (14.2%) reached 64% cellulose conversion after only 24 h of hydrolysis when compared with the 30% observed for the mill-processed bagasse containing an initial lignin content of 24.4%.

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Section: Resultssupporting

confidence: 53%

Enzymatic hydrolysis of chemithermomechanically pretreated sugarcane bagasse and samples with reduced initial lignin content

Mendes

Siqueira

Carvalho

et al. 2011

Biotechnology Progress

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“…Organosolv lignin is considered to be pure and unaltered (Mousavioun and Doherty 2010). In contrast, Protobind 1000 lignin is digested with caustic soda and the extract, which contains lignin, is treated with an acid to form a lignin slurry, which is filtered and then washed and dried.…”

Section: Reactions With Lignin Model Compoundsmentioning

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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“…Lignin has three monolignol monomers, methoxylated to various degrees: pcoumaryl, coniferyl and sinapyl alcohols [4], which exist in lignin as three basic substructure units: p-hydroxyphenyl (H), guaiacyl (G) and syringyl (S) units respectively [5,6]. The degree of lignin polymerisation in nature is difficult to measure and the exact structure of lignin is still unknown since it is fragmented during delignification/extraction processes [4]. The presence of lignin in biomass reduces the efficiency of enzymatic hydrolysis of carbohydrates due to the formation of physical lignin barriers.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of lignins isolated from sugarcane bagasse pretreated with acidified ethylene glycol and ionic liquids

Moghaddam

Zhang

Wellard

et al. 2014

Biomass and Bioenergy

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Chemical and thermal properties of fractionated bagasse soda lignin

Cited by 195 publications

References 12 publications

Enzymatic hydrolysis of chemithermomechanically pretreated sugarcane bagasse and samples with reduced initial lignin content

Enzymatic hydrolysis of chemithermomechanically pretreated sugarcane bagasse and samples with reduced initial lignin content

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

Characterisation of lignins isolated from sugarcane bagasse pretreated with acidified ethylene glycol and ionic liquids

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Chemical and thermal properties of fractionated bagasse soda lignin

Cited by 195 publications

References 12 publications

Enzymatic hydrolysis of chemithermomechanically pretreated sugarcane bagasse and samples with reduced initial lignin content

Enzymatic hydrolysis of chemithermomechanically pretreated sugarcane bagasse and samples with reduced initial lignin content

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

Characterisation of lignins isolated from sugarcane bagasse pretreated with acidified ethylene glycol and ionic liquids

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