Study of the oxygen effect on mechanical pulp lignin using an improved lignin isolation method
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Nathalie Marlin
Abstract
Lignins from kraft and mechanical pulps were isolated before and after oxygen treatment with conventional methods (acidolysis and enzymatic isolation) and with a novel two-step method combining an enzymatic treatment and acidolysis. Results showed that the combined enzymatic hydrolysis-acidolysis made it possible to extract lignin from pulp with a better yield than acidolysis alone and with a higher degree of purity than after enzymatic hydrolysis alone. The lignin samples isolated with the two-step method were analysed by 13C NMR, 19F NMR and by gel permeation chromatography. It was shown that the behaviour of mechanical pulp lignin during oxygen treatment was different from that of kraft pulp lignin. Most of these differences could be explained by the lower phenolic content and larger molecular size of the mechanical pulp lignin. As a consequence, oxygen had a poor delignifying effect. Finally, 19F NMR spectroscopy showed that oxygen could destroy some quinones induced by the alkaline conditions of the O stage.
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©2005 by Walter de Gruyter Berlin New York
Articles in the same Issue
- Obituary
- The role of non-phenolic lignin in chlorate-forming reactions during chlorine dioxide bleaching of softwood kraft pulp
- Study of the oxygen effect on mechanical pulp lignin using an improved lignin isolation method
- Quantitative 1H NMR analysis of alkaline polysulfide solutions
- A comparative study on the degradation of cotton linters induced by carbonate and hydroxyl radicals generated from peroxynitrite
- The carbonate radical as one-electron oxidant of carbohydrates in alkaline media
- Leaf-fiber lignins of Phormium varieties compared bysolid-state 13C NMR spectroscopy
- Antifungal activity of iridoid glycosides from the heartwood of Gmelina arborea
- Antioxidant activity of different components of pine species
- Dislocations in Norway spruce fibres and their effect on properties of pulp and paper
- Isolation and identification of antifungal compounds from Amboyna wood
- Biomechanical pulping of spruce wood chips with Streptomyces cyaneus CECT 3335 and handsheet characterization
- Three-dimensional visualisation of bacterial decay in individual tracheids of Pinus sylvestris
- Mass loss and moisture dynamics of Scots pine (Pinus sylvestris L.) exposed outdoors above ground in Sweden
- The influence of cation and anion structure of new quaternary ammonium salts on adsorption and leaching
- Speciation of arsenic and chromium in the leachate from chromated copper arsenate (CCA) type C treated southern pine (Pinus spp.)
- Metal chelation studies relevant to wood preservation.1. Complexation of propyl gallate with Fe2+
- Comparison of UV and confocal Raman microscopy to measure the melamine–formaldehyde resin content within cell walls of impregnated spruce wood
- Comparison of Pinus taeda L. wood property calibrations based on NIR spectra from the radial-longitudinal and radial-transverse faces of wooden strips
- Detection of failures of adhesively bonded joints using the acoustic emission method
- Effect of cross-sectional change of a board specimen on stress wave velocity determination
- Comments on the experimental methodology for determination of the hygro-mechanical properties of wood
- Properties of chemically and mechanically isolated fibres of spruce (Picea abies [L.] Karst.). Part 1: Structural and chemical characterisation
- Properties of chemically and mechanically isolated fibres of spruce (Picea abies[L.] Karst.). Part 2: Twisting phenomena
Articles in the same Issue
- Obituary
- The role of non-phenolic lignin in chlorate-forming reactions during chlorine dioxide bleaching of softwood kraft pulp
- Study of the oxygen effect on mechanical pulp lignin using an improved lignin isolation method
- Quantitative 1H NMR analysis of alkaline polysulfide solutions
- A comparative study on the degradation of cotton linters induced by carbonate and hydroxyl radicals generated from peroxynitrite
- The carbonate radical as one-electron oxidant of carbohydrates in alkaline media
- Leaf-fiber lignins of Phormium varieties compared bysolid-state 13C NMR spectroscopy
- Antifungal activity of iridoid glycosides from the heartwood of Gmelina arborea
- Antioxidant activity of different components of pine species
- Dislocations in Norway spruce fibres and their effect on properties of pulp and paper
- Isolation and identification of antifungal compounds from Amboyna wood
- Biomechanical pulping of spruce wood chips with Streptomyces cyaneus CECT 3335 and handsheet characterization
- Three-dimensional visualisation of bacterial decay in individual tracheids of Pinus sylvestris
- Mass loss and moisture dynamics of Scots pine (Pinus sylvestris L.) exposed outdoors above ground in Sweden
- The influence of cation and anion structure of new quaternary ammonium salts on adsorption and leaching
- Speciation of arsenic and chromium in the leachate from chromated copper arsenate (CCA) type C treated southern pine (Pinus spp.)
- Metal chelation studies relevant to wood preservation.1. Complexation of propyl gallate with Fe2+
- Comparison of UV and confocal Raman microscopy to measure the melamine–formaldehyde resin content within cell walls of impregnated spruce wood
- Comparison of Pinus taeda L. wood property calibrations based on NIR spectra from the radial-longitudinal and radial-transverse faces of wooden strips
- Detection of failures of adhesively bonded joints using the acoustic emission method
- Effect of cross-sectional change of a board specimen on stress wave velocity determination
- Comments on the experimental methodology for determination of the hygro-mechanical properties of wood
- Properties of chemically and mechanically isolated fibres of spruce (Picea abies [L.] Karst.). Part 1: Structural and chemical characterisation
- Properties of chemically and mechanically isolated fibres of spruce (Picea abies[L.] Karst.). Part 2: Twisting phenomena