Characterisation of water-soluble galactoglucomannans from Norway spruce wood and thermomechanical pulp

Willför, Stefan; Sjöholm, Rainer; Laine, Christiane; Roslund, Mattias U.; Hemming, Jarl; Holmbom, Bjarne

doi:10.1016/s0144-8617(02)00288-6

Cited by 180 publications

(156 citation statements)

References 18 publications

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“…Furthermore, of the acetyls determined by NMR, about 65% are O-acetylated at the C2 of Man and the rest at the C3 position. Integration of the peaks in NMR also show that 61% of the mannose units were acetylated which is consistent with the 65% obtained by Willför et al (2003).…”

Section: Composition and Properties Of Extracted Ggm And Mannan Modelsupporting

confidence: 87%

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The structure of galactoglucomannan impacts the degradation under alkaline conditions

et al. 2018

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Galactoglucomannan (GGM) from spruce was studied with respect to the degradation behavior in alkaline solution. Three reference systems including galactomannan from locust bean gum, glucomannan from konjac and the linear water-soluble carboxymethyl cellulose were studied with focus on molecular weight, sugar composition, degradation products, as well as formed oligomers, to identify relative structural changes in GGM. Initially all mannan polysaccharides showed a fast decrease in the molecular weight, which became stable in the later stage. The degradation of the mannan polysaccharides could be described by a function corresponding to the sum of two first order reactions; one slow that was ascribed to peeling, and one fast that was connected with hydrolysis. The galactose side group was stable under conditions used in this study (150 min, 90°C, 0.5 M NaOH). This could suggest that, apart from the covalent connection to C6 in mannose, the galactose substitutions also interact non-covalently with the backbone to stabilize the structure against degradation. Additionally, the combination of different backbone sugars seems to affect the stability of the polysaccharides. For carboxymethyl cellulose the degradation was linear over time which further suggests that the structure and sugar composition play an important role for the alkaline degradation. Molecular dynamics simulations gave details about the conformational behavior of GGM oligomers in water solution, as well as interaction between the oligomers and hydroxide ions.

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Section: Composition and Properties Of Extracted Ggm And Mannan Modelsupporting

confidence: 87%

“…Spruce GGM was extracted according to (Willför et al 2003). In short, thermo-mechanical spruce pulp was extracted with water at 60°C and the polysaccharides were thereafter precipitated with ethanol (method 2.3 in Willför et al).…”

Section: Methodsmentioning

confidence: 99%

The structure of galactoglucomannan impacts the degradation under alkaline conditions

et al. 2018

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“…[46] The acetylated mannan ( . [14,32,48] Here, through volume integration of the above contours, we report a ratio of 1.5 : 1 for loblolly pine.…”

Section: Naturally Acetylated Structuresmentioning

confidence: 89%

Characterization of nonderivatized plant cell walls using high‐resolution solution‐state NMR spectroscopy

Yelle

Ralph

Frihart

2008

Magnetic Reson in Chemistry

164

179

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A recently described plant cell wall dissolution system has been modified to use perdeuterated solvents to allow direct in-NMR-tube dissolution and high-resolution solution-state NMR of the whole cell wall without derivatization. Finely ground cell wall material dissolves in a solvent system containing dimethylsulfoxide-d 6 and 1-methylimidazole-d 6 in a ratio of 4 : 1 (v/v), keeping wood component structures mainly intact in their near-native state. Two-dimensional NMR experiments, using gradient-HSQC (heteronuclear single quantum coherence) 1-bond 13 C-1 H correlation spectroscopy, on nonderivatized cell wall material from a representative gymnosperm Pinus taeda (loblolly pine), an angiosperm Populus tremuloides (quaking aspen), and a herbaceous plant Hibiscus cannabinus (kenaf) demonstrate the efficacy of the system. We describe a method to synthesize 1-methylimidazole-d 6 with a high degree of perdeuteration, thus allowing cell wall dissolution and NMR characterization of nonderivatized plant cell wall structures.

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“…thermomechanical pulping (TMP), which enables softening of the lignin between the fibers, making it possible to preserve a much greater proportion of full-length fibers during the separation process. The heating is probably responsible for increased release of material into the water phase (Rintala and Puhakka 1994;Stephenson and Duff 1996;Kortekaas et al 1998;Willfor et al 2003), though the literature search did not reveal data to support such an expectation. The peroxide-bleaching of thermomechanical pulp (BCTMP) is known to convert hemicellulose components of TMP into negatively charged carboxylate species, which readily enter into solution and can contribute to the pollutant load (Sundberg et al 2000;Puro et al 2010;Hubbe et al 2012b;Miao et al 2013).…”

Section: Mechanical Pulpingmentioning

confidence: 96%

Wastewater Treatment and Reclamation: A Review of Pulp and Paper Industry Practices and Opportunities

Hubbe

Metts

Hermosilla

et al. 2016

BioRes

182

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The pulp and paper (P&P) industry worldwide has achieved substantial progress in treating both process water and wastewater, thus limiting the discharge of pollutants to receiving waters. This review covers a variety of wastewater treatment methods, which provide P&P companies with costeffective ways to limit the release of biological or chemical oxygen demand, toxicity, solids, color, and other indicators of pollutant load. Conventional wastewater treatment systems, often comprising primary clarification followed by activated sludge processes, have been widely implemented in the P&P industry. Higher levels of pollutant removal can be achieved by supplementary treatments, which can include anaerobic biological stages, advanced oxidation processes, bioreactors, and membrane filtration technologies. Improvements in the performance of wastewater treatment operations often can be achieved by effective measurement technologies and by strategic addition of agents including coagulants, flocculants, filter aids, and optimized fungal or bacterial cultures. In addition, P&P mills can implement upstream process changes, including dissolved-air-flotation (DAF) systems, filtration save-alls, and kidney-like operations to purify process waters, thus reducing the load of pollutants and the volume of effluent being discharged to end-of-pipe wastewater treatment plants. Keywords: Wastewater treatment; Pulp and paper manufacturing; Advanced oxidation; Membrane technologies; Clarification; Activated sludgeContact information: a: North Carolina State University, Dept. of Forest Biomaterials, Campus Box 8005, Raleigh, NC 29695-8005; b: WestRock Company, Water and Waste Treatment, 600 S 8th St, Fernandina Beach, FL 32034; c: Department of Agricultural and Forestry Engineering, University of Valladolid, Campus Duques de Soria, E-42004 Soria, Spain; d: Complutense University of Madrid, Department of Chemical Engineering, Ingn. Quim, Facultad de Ciencias Químicas, Ciudad Universitaria s/n,S-N, E-28040 Madrid, Spain; e: Concordia University, Dept. Bldg. Civil & Environm. Engn., 1455 Maisonneuve Blvd, West Montreal, PQ H3G 1M8, Canada; f: University of Jyväskylä, Dept. Chem., Box 35, FI-40014 Jyväskylä, Finland; g: Department of Biology, Center for Environmental and Marine Studies, CESAM, University of Aveiro, 3810-193 Aveiro, Portugal; h: Department of Environment and Planning, Center for Environmental and Marine Studies, CESAM, Aveiro & Department of Materials and Ceramics, Institute of Materials, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal; i: FPInnovations, 570 St. Jean Blvd., Pointe Claire, PQ H9R 3J9, Canada; * Corresponding author: hubbe@ncsu.edu Contents of the Article INTRODUCTIONThe pulp and paper (P&P) industry occupies a challenging position with respect to the natural environment. On the positive side, the industry is based on the usage of renewable, photosynthetic resources. On the other hand, the industry discharges huge quantities of aqueous effluents. Large volumes (up to 70 m 3 ) of wastewater ...

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Characterisation of water-soluble galactoglucomannans from Norway spruce wood and thermomechanical pulp

Cited by 180 publications

References 18 publications

The structure of galactoglucomannan impacts the degradation under alkaline conditions

The structure of galactoglucomannan impacts the degradation under alkaline conditions

Characterization of nonderivatized plant cell walls using high‐resolution solution‐state NMR spectroscopy

Wastewater Treatment and Reclamation: A Review of Pulp and Paper Industry Practices and Opportunities

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