Biomechanical pulping of spruce wood chips with Streptomyces cyaneus CECT 3335 and handsheet characterization
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Manuel Hernández
Abstract
The actinobacterium Streptomyces cyaneus CECT 3335 was evaluated for its ability to delignify spruce wood chips (Picea abies) after 2 weeks of incubation prior to refiner mechanical pulping. Weight loss of the chips during the treatment ranged from 2% to 3%. Chemicalanalysis of the treated wood showed an increase in acid-soluble lignin content concomitant with a notable increase in the acid/aldehyde+ketone [AC/(AL+KE)] ratio of the lignin compared with the control. Structural alterations in wood cell walls were observed by optical and scanning microscopy using astra blue-safranin staining and cryosections stained with gold/palladium, respectively. A gradual loss of lignin from the lumen towards the middle lamella and incipient defiberization could be observed. The estimation of specific energy for the defibration and refining stages of treated pulp showed a 24% reduction in the energy required, largely due to a 30% saving in the defibration of chips. The analysis of handsheets obtained from treated pulp showed a notable improvement in some strength properties, such as breaking length, tear index and stretch. In addition, the high Gurley air resistance value indicates more packing of the voids of the fiber network. These results demonstrate for the first time the suitability of Streptomyces cyaneus for biomechanical pulping purposes.
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©2005 by Walter de Gruyter Berlin New York
Artikel in diesem Heft
- 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
Artikel in diesem Heft
- 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
