Sorption of corn cob and oat spelt arabinoxylan onto softwood kraft pulp
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Felipe Ramírez
Abstract
Arabinoxylans from corn cob and oat spelt were studied in sorption experiments onto bleached and unbleached softwood kraft pulp. The corn cob (CC) xylans were produced by steam extraction (SE-CC) and alkaline extraction (NaOH-CC), while the oat spelt xylan (NaOH-OS) was obtained by alkaline extraction. Both alkaline extracted xylans exhibited a high degree of polymerization (DP) (230–240), whereas the steam extraction induced a significant degradation resulting in DPs around 36. Investigation of the xylan addition mode revealed that adding xylan before beating of pulp is most effective for increasing the beating degree and the strength properties. The tensile and burst indices are improved by xylan addition over the whole range of beating degrees. In contrast to that, the tear strength is increased significantly for unbeaten pulps but declines after beating, compared to the reference. Xylan sorption rates are increased with prolonged beating. Highest sorption rates are observed for the NaOH-OS (12–32%) and lowest for the SE-CC xylan (6.6–14%). In general, the alkaline extracted xylans have a better performance, most likely as a result of their higher molar masses.
©2008 by Walter de Gruyter Berlin New York
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- Effects of thermomechanical refining conditions on the morphology and thermal properties of wheat straw fibre
- Extractive composition and summative chemical analysis of thermally treated eucalypt wood
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- Determination of the thermal conductivity of wood by the hot plate method: The influence of morphological properties of fir wood (Abies alba Mill.) to the contact thermal resistance
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- Obituary
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Artikel in diesem Heft
- Meetings
- Original Papers
- Topochemical investigation on tension wood fibres of Acer spp., Fagus sylvatica L. and Quercus robur L.
- Developing environmentally benign and effective organic wood preservatives by understanding the biocidal and non-biocidal properties of extractives in naturally durable heartwood
- Assessment of biodeterioration for the screening of new wood preservatives: Calculation of stiffness loss in rapid decay testing
- Degradation of thermo-hygro-mechanically (THM)-densified wood by soft-rot fungi
- FT-NIR spectroscopy in predicting the decay resistance related characteristics of solid Scots pine (Pinus sylvestris L.) heartwood
- Effects of fixation temperature and environment on copper speciation in ACQ treated red pine
- Fixation of copper(II)-protein formulation in wood: Part 1. Influence of tannic acid on fixation of copper in wood
- Fixation of copper-protein formulation in wood: Part 2. Molecular mechanism of fixation of copper(II) in cellulose, lignin and wood studied by EPR
- 1-Alkoxymethyl-X-dimethylaminopyridinium-base ionic liquids in wood preservation
- Short Note
- Synthesis and evaluation of phosphortriamidates in wood for thermal and fungal decay protection
- Original Papers
- 3D magnetic resonance microscopy of a wounded beech branch
- Sorption of corn cob and oat spelt arabinoxylan onto softwood kraft pulp
- Effects of thermomechanical refining conditions on the morphology and thermal properties of wheat straw fibre
- Extractive composition and summative chemical analysis of thermally treated eucalypt wood
- Analysis of cell wall swelling on the basis of a cylindrical model
- Swelling of larch wood in organic liquids
- Determination of the thermal conductivity of wood by the hot plate method: The influence of morphological properties of fir wood (Abies alba Mill.) to the contact thermal resistance
- Short Note
- Study of the retarding mechanism of citric acid during gypsum particleboard manufacturing
- Obituary
- William Edwin (Ted) Hillis (1921–2008)
