Enzymatic polymerisation and effect of fractionation of dissolved lignin from Eucalyptus globulus Kraft liquor

Gouveia, Susana; Fernández‐Costas, Carmen; Sanromán, M.A.; Moldes, Diego

doi:10.1016/j.biortech.2012.05.144

Cited by 58 publications

(50 citation statements)

References 24 publications

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“…Organosolv treatments produce more homogeneous lignin fractions with defined molecular mass distribution, chemical group functionalities (Gouveia et al 2012), and low molecular weight (Lora et al 2008). The obtained results were in agreement with these studies.…”

Section: Lignin Molecular Weightsupporting

confidence: 89%

Fractionation of Hemicelluloses and Lignin from Rice Straw by Combining Autohydrolysis and Optimised Mild Organosolv Delignification

Moniz¹,

Lino²,

Duarte³

et al. 2015

BioResources

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An integrated strategy was followed to valorise rice straw, one of the most relevant biomass feedstocks available worldwide, to selectively recover solubilised hemicelluloses and lignin. The pathway encompassed the use of autohydrolysis to hydrolyse the hemicelluloses and an ethanol-based organosolv process to solubilise lignin. Several autohydrolysis conditions were assayed with the best results obtained at 210 ºC (log R0 4.15), which enabled high removal of hemicelluloses, yielding an oligosaccharide-rich hydrolysate and a treated biomass with low content of hemicelluloses and enriched in cellulose and lignin. The effects of ethanol concentration (5 to 75%), and reaction time (0 to 24 h) on lignin removal under mild temperature (30 ºC) were studied. In optimal conditions (60.5% ethanol, 24h) the delignification yield reached 42%, whereas glucan solubilisation was below 17%. Lignin solubilisation yield was not influenced by the organosolv treatment duration while ethanol concentration favored the delignification up to 60.5% ethanol. The organosolv liquors contained economic interesting ligninderived compounds such as vanillin, ferulic, and coumaric acids. The chemical composition and enzymatic digestibility of the treated biomass from autohydrolysis and organosolv delignification were compared, with the latter presenting an almost 10% higher enzymatic digestibility than the former.

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Section: Lignin Molecular Weightsupporting

confidence: 89%

Fractionation of Hemicelluloses and Lignin from Rice Straw by Combining Autohydrolysis and Optimised Mild Organosolv Delignification

Moniz¹,

Lino²,

Duarte³

et al. 2015

BioResources

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show abstract

“…molecules) and synthesis of fine chemicals under mild reaction conditions [4,[7][8][9][10][11]. Previous studies have also shown that the modifications with laccase are highly dependent on the type of lignin, reaction conditions (pH, temperature), redox potential and type of laccase [7,[12][13][14]. Although the presence of oxygen as http://dx.doi.org/10.1016/j.procbio.2015.05.003 1359-5113/© 2015 Elsevier Ltd. All rights reserved.…”

Section: Introductionmentioning

confidence: 99%

Laccase mediated oxidation of industrial lignins: Is oxygen limiting?

Ortner

Huber

Haske-Cornelius

et al. 2015

Process Biochemistry

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“…Radicals generated during the reaction between laccase and lignin can create different mesomeric forms that may couple in many possible ways, forming new linkages in only a few hours (Gouveia et al 2012). Increasing in the MW on biodegraded-lignin sample observed at 6 th day can be indicative of the presence of new linkages caused during fungus growth.…”

Section: Sec Analysesmentioning

confidence: 99%

Fragmentation of Lignin from Organosolv Black Liquor by White Rot Fungi

Negrão¹,

Sain²,

Leão³

et al. 2015

BioResources

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The mycelial growth ability of 13 white rot fungi were separately evaluated in kraft, organosolv, and soda black liquor agar-plates. The fungus able to best grow and decolorize black liquor agar-plates was grown in organosolv black liquor to investigate whether it reduced organosolv lignin molar mass. The fungus Bjerkandera adusta showed fair mycelial growth and decolorization ability in 10% black liquor-agar plates. To obtain low-molecular weight (MW) lignin, B. adusta was cultivated in 150-mL Erlenmeyer flasks containing 10% black liquor and maintained in a shaking culture for 15 days. Lignin was recovered from each Erlenmeyer flask by acid precipitation and was analysed by size exclusion chromatography (SEC) and Fourier transform infrared (FTIR) spectroscopy. The lowest MW of lignin from black liquor was observed on the 11 th and 12 th days, at 1461 and 1790 kDa, respectively, with the polydispersity close to 1.0, indicating that the molecules were similar in size. Fourier transform infrared spectra bands showed modification of the lignin structure during 9 days, with new bands appearing after five days of lignin biodegradation.

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Enzymatic polymerisation and effect of fractionation of dissolved lignin from Eucalyptus globulus Kraft liquor

Cited by 58 publications

References 24 publications

Fractionation of Hemicelluloses and Lignin from Rice Straw by Combining Autohydrolysis and Optimised Mild Organosolv Delignification

Fractionation of Hemicelluloses and Lignin from Rice Straw by Combining Autohydrolysis and Optimised Mild Organosolv Delignification

Laccase mediated oxidation of industrial lignins: Is oxygen limiting?

Fragmentation of Lignin from Organosolv Black Liquor by White Rot Fungi

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