Lignocellulosic fiber charge enhancement by catalytic oxidation during oxygen delignification

Zhang, Dongcheng; Chai, Xin‐Sheng; Pu, Yunqiao; Ragauskas, Arthur J.

doi:10.1016/j.jcis.2006.10.046

Cited by 17 publications

(13 citation statements)

References 25 publications

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“…In addition, Cu II (bpy)‐catalyzed AHP pretreatment of biomass resulted in a colloidal suspension of solids that could not be removed by centrifugation at 4,500 g . This is consistent with the introduction of multiple charged carboxyl groups along the polysaccharide backbone [e.g., at the C6 for cellulose (Zhang et al, 2007)], which at alkaline pH would result in electrostatic repulsions between individual polysaccharide polymers (Habibi et al, 2006). Importantly, oxidative depolymerization of cellulose by GH61 enzymes was recently shown to introduce a lactone group at the C1 carbon which may spontaneously hydrolyze to yield an aldonic acid (Quinlan et al, 2011).…”

Section: Resultssupporting

confidence: 68%

Catalysis with Cu^II(bpy) improves alkaline hydrogen peroxide pretreatment

Chen

Liu

et al. 2012

Biotech & Bioengineering

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Copper(II) 2,2'-bipyridine (Cu(II) (bpy))-catalyzed alkaline hydrogen peroxide (AHP) pretreatment was performed on three biomass feedstocks including alkali pre-extracted switchgrass, silver birch, and a hybrid poplar cultivar. This catalytic approach was found to improve the subsequent enzymatic hydrolysis of plant cell wall polysaccharides to monosaccharides for all biomass types at alkaline pH relative to uncatalyzed pretreatment. The hybrid poplar exhibited the most significant improvement in enzymatic hydrolysis with monomeric sugar release and conversions more than doubling from 30% to 61% glucan conversion, while lignin solubilization was increased from 36.6% to 50.2% and hemicellulose solubilization was increased from 14.9% to 32.7%. It was found that Cu(II) (bpy)-catalyzed AHP pretreatment of cellulose resulted in significantly more depolymerization than uncatalyzed AHP pretreatment (78.4% vs. 49.4% decrease in estimated degree of polymerization) and that carboxyl content the cellulose was significantly increased as well (fivefold increase vs. twofold increase). Together, these results indicate that Cu(II) (bpy)-catalyzed AHP pretreatment represents a promising route to biomass deconstruction for bioenergy applications.

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Section: Resultssupporting

confidence: 68%

Catalysis with Cu^II(bpy) improves alkaline hydrogen peroxide pretreatment

Chen

Liu

et al. 2012

Biotech & Bioengineering

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“…Ozone and chlorine dioxide reduce the amount of charge considerably. An exception of a slight total charge increase after oxygen delignification was also reported (Laine and Stenius 1997;Yang et al 2003;Risen et al 2004;Zhang et al 2007).…”

Section: Introductionsupporting

confidence: 60%

Correlation Analysis for Fiber Characteristics and Strength Properties of Softwood Kraft Pulps from Different Stages of a Bleaching Fiber Line

Lin¹,

He²,

Liu³

et al. 2014

BioResources

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During sequential bleaching operations, pulp fiber properties are gradually changed due to mechanical and chemical treatments. In this study, the correlations between pulp or fiber properties such as kappa number, viscosity, total charge, fiber length, and zero-span tensile strength as well as Scott bond of elemental chlorine free (ECF) bleached softwood kraft pulps was investigated. The influence of zero-span tensile strength and Scott bond on tensile and tear strength was also discussed. The Scott bond and zero-span tensile strength showed a strong logarithmic correlation with pulp kappa number and pulp viscosity, while the regression coefficient for Scott bond was negative. An overall deterioration of paper tensile and tear strength from pulps whether beaten or not were observed along the multi-stage ECF bleaching operations. Changing contributions to sheet tensile or tear strength could be mostly attributed to changes in zero-span tensile strength rather than Scott bond during ECF bleaching.

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“…Post-treatment of steam pretreated Douglas-fir by alkali-oxygen increased enzymatic hydrolysis, although the substrate still contained more than 10% (w/w) lignin (Pan et al, 2004). One possible explanation for the increase in hydrolysis yields is that the carboxylic acid content of the residual lignin was increased by oxygen-delignification (Zhang et al, 2007). By increasing the hydrophilicity of the lignin and by increasing its carboxylic content, this may facilitate the solubilization of lignin in water and likely enhances the enzymatic hydrolysis of the pretreated substrates.…”

Section: The Effect Of the Carboxylic Groups In Lignin On The Enzymatmentioning

confidence: 99%

Enhancing the enzymatic hydrolysis of lignocellulosic biomass by increasing the carboxylic acid content of the associated lignin

Nakagame

Chandra

Kadla

et al. 2010

Biotech & Bioengineering

231

137

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To assess the effects that the physical and chemical properties of lignin might have on the enzymatic hydrolysis of pretreated lignocellulosic substrates, protease treated lignin (PTL) and cellulolytic enzyme lignin (CEL) fractions, isolated from steam and organosolv pretreated corn stover, poplar, and lodgepole pine, were prepared and characterized. The adsorption of cellulases to the isolated lignin preparations corresponded to a Langmuir adsorption isotherm. It was apparent that, rather than the physical properties of the isolated lignin, the carboxylic acid functionality of the isolated lignin, as determined by FTIR and NMR spectroscopy, had much more of an influence when lignin was added to typical hydrolysis of pure cellulose (Avicel). An increase in the carboxylic content of the lignin preparation resulted in an increased hydrolysis yield. These results suggested that the carboxylic acids within the lignin partially alleviate non-productive binding of cellulases to lignin. To try to confirm this possible mechanism, dehydrogenative polymers (DHP) of monolignols were synthesized from coniferyl alcohol (CA) and ferulic acid (FA), and these model compounds were added to a typical enzymatic hydrolysis of Avicel. The DHP from FA, which was enriched in carboxylic acid groups compared with the DHP from CA, adsorbed a lower mount of cellulases and did not decrease hydrolysis yields when compared to the DHP from CA, which decreased the hydrolysis of Avicel by 8.4%. Thus, increasing the carboxylic acid content of the lignin seemed to significantly decrease the non-productive binding of cellulases and consequently increased the enzymatic hydrolysis of the cellulose.

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Lignocellulosic fiber charge enhancement by catalytic oxidation during oxygen delignification

Cited by 17 publications

References 25 publications

Catalysis with Cu^II(bpy) improves alkaline hydrogen peroxide pretreatment

Catalysis with Cu^II(bpy) improves alkaline hydrogen peroxide pretreatment

Correlation Analysis for Fiber Characteristics and Strength Properties of Softwood Kraft Pulps from Different Stages of a Bleaching Fiber Line

Enhancing the enzymatic hydrolysis of lignocellulosic biomass by increasing the carboxylic acid content of the associated lignin

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Lignocellulosic fiber charge enhancement by catalytic oxidation during oxygen delignification

Cited by 17 publications

References 25 publications

Catalysis with CuII(bpy) improves alkaline hydrogen peroxide pretreatment

Catalysis with CuII(bpy) improves alkaline hydrogen peroxide pretreatment

Correlation Analysis for Fiber Characteristics and Strength Properties of Softwood Kraft Pulps from Different Stages of a Bleaching Fiber Line

Enhancing the enzymatic hydrolysis of lignocellulosic biomass by increasing the carboxylic acid content of the associated lignin

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Catalysis with Cu^II(bpy) improves alkaline hydrogen peroxide pretreatment

Catalysis with Cu^II(bpy) improves alkaline hydrogen peroxide pretreatment