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Henriksson, Åsa; Gatenhalm, Paul

doi:10.1023/a:1015826713109

Cited by 36 publications

(11 citation statements)

References 15 publications

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“…However, HYP fibers display poor flexibility, low whiteness, susceptibility to photo-yellowing, thermal reversion, and low contribution to paper strength because of the high lignin content (Liu et al 2012). Therefore, modifications to HYP are needed to improve the quality of the paper and hence broaden its application (Lachenal et al 1995;Henriksson and Gatenhalm 2002). The common modification methods for fiber include mechanical modification, chemical modification (Gruber et al 2002), and physical modification (Goring 1967;Carlsson and Ström 1995).…”

Section: Introductionmentioning

confidence: 99%

“…The common modification methods for fiber include mechanical modification, chemical modification (Gruber et al 2002), and physical modification (Goring 1967;Carlsson and Ström 1995). With the development of biotechnology, enzymes are of great interest in studies for the modification of pulp (Sigoillot et al 1997;Richardson et al 1998;Henriksson and Gatenhalm 2002). Enzymes do not generate the pollution that other methods generate.…”

Section: Introductionmentioning

confidence: 99%

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Structural Analysis of Fast-Growing Aspen Alkaline Peroxide Mechanical Pulp Lignin: A Post-Enzymatic Treatment

et al. 2016

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An enzymatic mild acidic hydrolysis was used to separate and purify residual lignin from alkaline peroxide mechanical pulp (APMP). Using the optimum conditions for the laccase treatment (pH 4.5, temperature 50 °C, lignin consistency of 1%, a reaction time of 60 min, and a laccase dosage of 8 μ/g), oven-dried lignin was treated with laccase and in a laccase mediator system (LMS) to explore the mechanism for laccase and the LMS modification of APMP. The changes of functional groups in lignin were analyzed using nuclear magnetic resonance ( C-NMR spectra revealed that the lignin structure changed significantly with the laccase and the LMS treatments. Meanwhile, GPC demonstrated that laccase without a mediator could lead to the polymerization of lignin, while the LMS could degrade the lignin. Hence, it was concluded that laccase is an attractive enzyme for lignin modification.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structural Analysis of Fast-Growing Aspen Alkaline Peroxide Mechanical Pulp Lignin: A Post-Enzymatic Treatment

et al. 2016

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“…The hemicelluloses can be utilized in a number of ways. In monomeric form they can be fermented to ethanol or xylitol [8,9], in oligomeric form they have considerable potential for application in foods [10], and in polymeric form they have been tested as thermoplastic materials [11], as fillers for polypropylene [12], as a coating for cellulosic fibers [13], as hydrogels [14,15], and as bio-degradable barrier films for food packaging [15,16].…”

Section: Introductionmentioning

confidence: 99%

“…1 H NMR (spectrum A) and13 C NMR (spectrum B) of hemicellulosic fraction H 3 isolated from dewaxed C. sinica (solvent D 2 O).The methyl protons of acetate group and methoxyl protons in 4-O-methyl-Dglucuronic acid exhibited peaks at 1.72 ppm and 3.43 ppm, respectively. The protons of the α-linked glucuronic acid units gave signals at 5.25 and 5.35 ppm[36].…”

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confidence: 99%

Fractional isolation and structural characterization of hemicellulosic polymers from Caragana sinica

Xiao¹,

Xu²,

Sun

2011

E-Polymers

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The cell wall material of Caragana sinica was fractionated by successive extractions with distilled water at 80 °C for 2 h, 70% ethanol, 70% ethanol containing 1% NaOH, 1 M KOH, 1 M NaOH, 3 M KOH, and 3 M NaOH at 75 °C for 3 h. The sequential treatments resulted in a total dissolution of 86.7% of the original hemicelluloses and 80.1% of the original lignin from dewaxed C. sinica. The current results showed that the four alkali-soluble hemicellulosic preparations, comprising almost 80% xylose of the total neutral sugars, were more linear and acidic, but lower molecular weights ( w , 28420-55140 g/mol) than the other two organosolv-soluble hemicelluloses ( w , 57930-96470 g/mol). The 1 M KOH-soluble hemicellulosic fraction was characterized by sugar analysis and 1D, 2D NMR spectroscopy and was found to be composed of a linear (1→4)-β-D-xylopyranosyl main chain with a 4-Omethylglucuronic acid substituting the C-2 position of approximately every eight xylose unit, which is typical of a hardwood acidic 4-O-methylglucuronoxylan (MGX).

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“…CTMP is produced by a relatively mild chemical treatment followed by a pressurized refining step (Börås and Gatenholm 1999). Many absorbent hygiene products, especially those found on the European markets, contain softwood bleached CTMP and it is used in printing paper and board grades to increase opacity and to improve sheet formation or to replace reinforcement pulps (Konn et al 2002;Henriksson and Gatenholm 2002). The surfaces of CTMP fibres are formed during mechanical disintegration and refining of chemically treated wood.…”

Section: Introductionmentioning

confidence: 99%

Endoxylanase action towards the improvement of recycled fibre properties

2008

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The nature of recycled paper fibres varies widely. Those fibres contain high amounts of heteroxylans and lignin besides cellulose. In order to study the potential effect of xylanases on the quality of recycled fibres, chemithermomechanical pulp fibres (CMTP) are used as model substrates owing to their high content in non-cellulosic components. It has been found that the morphology of CTMP fibres changes by means of xylanase treatment. Treatments of CTMP fibres with an endoxylanase result in an improved surface area of the fibres by fibrillation, without shortening the fibres. The chemical composition of the surfaces of the fibres changes and an augment in surface hydrophilicity as a result of the removal of lignin and extractives associated to the xylan backbones is observed. Experimental results are in agreement with the findings when studying the chemical composition of the fibres' surfaces: the xylan backbone is removed by the action of the endoxylanase, resulting in fibre fibrillation; further hydrolysis of released xylan chains proceeds in the bulk down to the monomer xylose

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Cited by 36 publications

References 15 publications

Structural Analysis of Fast-Growing Aspen Alkaline Peroxide Mechanical Pulp Lignin: A Post-Enzymatic Treatment

Structural Analysis of Fast-Growing Aspen Alkaline Peroxide Mechanical Pulp Lignin: A Post-Enzymatic Treatment

Fractional isolation and structural characterization of hemicellulosic polymers from Caragana sinica

Endoxylanase action towards the improvement of recycled fibre properties

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