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  • 1. Berggren, R.
    et al.
    Molin, U.
    Berthold, F.
    Lennholm, H.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH). KTH, Fibre- and Polymer technology.
    Lindström, M.
    Alkaline degradation of birch and spruce: Influence of degradation conditions on molecular mass distributions and fibre strength2002In: Carbohydrate Polymers, Vol. 51, no 3, p. 255-264Article in journal (Refereed)
  • 2. Ek, R.
    et al.
    Lennholm, H.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH). KTH, Fibre- and Polymer technology.
    Davidson, R.
    Nyström, C.
    Ragnarsson, G.
    Pore swelling in beads made of cellulose fibres and fibre fragments1995In: International Journal of Pharmaceutics, Vol. 122, no 1-2, p. 49-56Article in journal (Refereed)
  • 3. Gustafsson, C.
    et al.
    Lennholm, H.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH). KTH, Fibre- and Polymer technology.
    Iversen, T.
    Nyström, C.
    Comparison of solid-state NMR and isothermal microcalorimetry in the assessment of the amorphous component of lactose1998In: International Journal of Pharmaceutics, Vol. 174, no 1-2, p. 243-252Article in journal (Refereed)
  • 4. Gustafsson, C.
    et al.
    Lennholm, H.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH). KTH, Fibre- and Polymer technology.
    Iversen, T.
    Nyström, C.
    Evaluation of Surface and Bulk Characteristics of Cellulose I Powders in Relation to Compaction Behavior and Tablet Properties2003In: Drug Development and Industrial Pharmacy, Vol. 29, no 10, p. 1095-1107Article in journal (Refereed)
  • 5. Gustafsson, C.
    et al.
    Nyström, C.
    Lennholm, H.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH). KTH, Fibre- and Polymer technology.
    Bonferoni, M. C.
    Caramella, C. M.
    Characteristics of hydroxypropyl methylcellulose influencing compactibility and prediction of particle and tablet properties by infrared spectroscopy2003In: Journal of Pharmaceutical Sciences, Vol. 92, no 3, p. 494-504Article in journal (Refereed)
  • 6. Hafrén, J.
    et al.
    Westermark, U.
    Lennholm, H.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH). KTH, Fibre- and Polymer technology.
    Terashima, N.
    Formation of13C-enriched cell-wall DHP using isolated soft xylem from Picea abies2002In: Holzforschung, Vol. 56, no 6, p. 585-591Article in journal (Refereed)
  • 7.
    Henriksson, Gunnar
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Lennholm, Helena
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Cellulose and carbohydrate chemistry2009In: Pulp and Paper Chemistry and Technology: Wood Chemistry and Wood Biotechnology / [ed] Ek, Monica / Gellerstedt, Göran / Henriksson, Gunnar, Berlin: Walter de Gruyter, 2009, p. 71-99Chapter in book (Refereed)
  • 8.
    Henriksson, Gunnar
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Lennholm, Helena
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Brännvall, Elisabet
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    The Trees2009In: Pulp and Paper Chemistry and Technology: Wood chemistry and wood biotechnology / [ed] Monica Ek, Göran Gellerstedt, Gunnar Henriksson, Berlin: Walter de Gruyter, 2009, p. 13-44Chapter in book (Other academic)
  • 9. Iversen, T.
    et al.
    Lennholm, H.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH). KTH, Fibre- and Polymer technology.
    Estimation of Cellulose I and II in Cellulosic Samples by Principal Component Analysis of 13C-CP/MAS-NMR-Spectra1995In: Holzforschung, Vol. 49, no 2, p. 119-126Article in journal (Refereed)
  • 10. Jardeby, K.
    et al.
    Germgård, U.
    Kreutz, B.
    Heinze, T.
    Heinze, U.
    Lennholm, H.
    Effect of pulp composition on the characteristics of residuals in CMC made from such pulps2005In: Cellulose, Vol. 12, no 4, p. 385-393Article in journal (Refereed)
  • 11. Jardeby, K.
    et al.
    Germgård, U.
    Kreutz, B.
    Heinze, T.
    Heinze, U.
    Lennholm, H.
    The influence of fibre wall thickness on the undissolved residuals in CMC solutions2005In: Cellulose, Vol. 12, no 2, p. 167-175Article in journal (Refereed)
  • 12. Jardeby, K.
    et al.
    Germgård, U.
    Kreutz, B.
    Lennholm, H.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH). KTH, Fibre- and Polymer technology.
    Influence of the pulp composition on the amount and characteristics of the undissolved residuals in CMC2003Conference paper (Refereed)
  • 13. Jardeby, K.
    et al.
    Germgård, U.
    Kreutz, B.
    Lennholm, Helena
    Influence of compression wood content on the characteristics of the undissolved residuals in CMC2007In: Appita Journal, Vol. 60, no 1, p. 55-59Article in journal (Refereed)
  • 14. Jardeby, K
    et al.
    Lennholm, Helena
    KTH, Superseded Departments, Fibre and Polymer Technology.
    Germgard, U
    Characterisation of the undissolved residuals in CMC-solutions2004In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 11, no 2, p. 195-202Article in journal (Refereed)
    Abstract [en]

    The undissolved fibre and gel residuals that had not completely reacted to form fully dissolved carboxy-methyl cellulose (CMC) in the production of CMC were studied to clarify the reactivity of wood components in the pulp. The undissolved residuals, the pulp and the CMC were therefore analysed on the fibre level, the cell-wall level and the chemical composition level. The results may be interpreted as indicating that the presence of undissolved residuals in the CMS was not due to any chemical difference. The undissolved residuals were shown to consist mainly of swollen cell wall parts and some whole wood cells, mainly thick-walled compression wood and summerwood cells. They react more slowly in the mercerisation and etherification, probably because of a greater diffusion resistance due to their larger dimensions or to a more dense structure. These cells are assumed to be less accessible for chemical penetration, but they may also contain supramolecular structures that slow down the CMC reaction.

  • 15. Johansson, A.
    et al.
    Lennholm, H.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH). KTH, Fibre- and Polymer technology.
    Influences of SO2and O3on the ageing of paper investigated by in situ diffuse reflectance FTIR and time-resolved trace gas analysis2000In: Applied Surface Science, Vol. 161, no 1, p. 163-169Article in journal (Refereed)
  • 16. Josefsson, T.
    et al.
    Lennholm, H.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH). KTH, Fibre- and Polymer technology.
    Gellerstedt, G.
    Changes in cellulose supramolecular structure and molecular weight distribution during steam explosion of aspen wood2002In: Cellulose, Vol. 8, no 4, p. 289-296Article in journal (Refereed)
  • 17. Josefsson, T.
    et al.
    Lennholm, H.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH). KTH, Fibre- and Polymer technology.
    Gellerstedt, G.
    Steam explosion of aspen wood. Characterisation of reaction products2002In: Holzforschung, Vol. 56, no 3, p. 289-297Article in journal (Refereed)
  • 18.
    Krusa, Martin
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Wood Chemistry and Pulp Technology.
    Lennholm, Helena
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Wood Chemistry and Pulp Technology.
    Henriksson, Gunnar
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Wood Chemistry and Pulp Technology.
    Pre-treatment of cellulose by cellobiose dehydrogenase increases the degradation rate by hydrolytic cellulases2007In: Cellulose Chemistry and Technology, ISSN 0576-9787, Vol. 41, no 2-3, p. 105-111Article in journal (Refereed)
    Abstract [en]

    Cellobiose dehydrogenase (CDH) is an extra-cellular flavocytochrome with unknown biological function, produced by various wood degrading fungi. In the presence of Fe(III) and cellobiose, CDH produces hydroxyl radicals through a Fenton-type reaction. Treatment of cellulose with CDH, cellobiose, hydrogen peroxide and ferriacetate decreased cellulose's polymerization degree and increased its degradability for different functional types of hydrolytic cellulases, except for an exo-enzyme working from the reducing end. This suggests a biological role for CDH in fungal cellulose degradation, possibly by activating the cellulose for hydrolytic cellulases by depolymerization and disturbance of the hydrogen bonding pattern in cellulose.

  • 19.
    Lennholm, H.
    et al.
    KTH, Fibre- and Polymer technology.
    Iversen, T.
    Classification of Pulp Fibres from Different Wood’ Species by Multivariate Data Analysis of 13C-CP/MAS-NMR-Spectra1995In: Holzforschung, Vol. 49, no 5, p. 462-464Article in journal (Refereed)
  • 20.
    Lennholm, Helena
    KTH, Superseded Departments (pre-2005), Pulp and Paper Technology.
    Investigtions of cellulose polymorphs by 13C-CP/MAS-NMR spectroscopy and chemometrics1994Doctoral thesis, comprehensive summary (Other academic)
  • 21.
    Lennholm, Helena
    et al.
    KTH, School of Industrial Engineering and Management (ITM).
    Bonferoni, M. C.
    Caramella, C.
    Lennholm, H.
    Nyström, C.
    Characterisation of particle properties and compaction behaviour of hydroxypropyl methylcellulose with different degrees of methoxy/hydroxypropyl substitution1999In: European Journal of Pharmaceutical Sciences, Vol. 9, no 2, p. 171-184Article in journal (Refereed)
  • 22.
    Lennholm, Helena
    et al.
    KTH, School of Industrial Engineering and Management (ITM).
    Eriksson, Roland
    Determination of moisture content in impregnated paper using near infrared spectroscopy1999Conference paper (Refereed)
  • 23.
    Lennholm, Helena
    et al.
    KTH, School of Industrial Engineering and Management (ITM).
    Henriksson, Gunnar
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
    Wood Chemistry and Biotechnology: Cellulose and Carbohydrate Chemistry2009Book (Other academic)
  • 24.
    Lennholm, Helena
    et al.
    KTH, School of Industrial Engineering and Management (ITM).
    Henriksson, Gunnar
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
    Kruså, Martin
    Pre-treatment of cellulose be cellobiose dehydrogenase increases the degradation rate by hydrolytic cellulase2007In: Cellulose Chemistry and Technology, ISSN 0576-9787, Vol. 41, no 2-3, p. 105-111Article in journal (Refereed)
  • 25.
    Lennholm, Helena
    et al.
    KTH, School of Industrial Engineering and Management (ITM).
    Hult, E.
    Molin, U.
    Daniel, G.
    Iversen, T.
    Lennholm, H.
    The influence of hemicellulose on fibril aggregation of kraft pulp fibres as revealed by FE-SEM and CP/MAS 13C-NMR2001In: Cellulose, Vol. 8, no 2, p. 103-111Article in journal (Refereed)
  • 26.
    Lennholm, Helena
    et al.
    KTH, School of Industrial Engineering and Management (ITM).
    Iversen, T.
    Structural characterisation of lignocellulosic samples using 13C-CP/MAS-NMR-spectroscopy and chemometrics1993Conference paper (Refereed)
  • 27.
    Lennholm, Helena
    et al.
    KTH, School of Industrial Engineering and Management (ITM).
    Iversen, T.
    Structural characterization of lignocellulosic samples using 13C-CP/MAS-NMR-spectroscopy and chemometrics1998In: Use of Minerals in Papermaking, p. 93-100Article in journal (Refereed)
  • 28.
    Lennholm, Helena
    et al.
    KTH, School of Industrial Engineering and Management (ITM).
    Larsson, T.
    Iversen, T.
    Determination of cellulose Iαand Iβin lignocellulosic materials1994In: Carbohydrate Research, Vol. 261, no 1, p. 119-131Article in journal (Refereed)
  • 29.
    Lennholm, Helena
    et al.
    KTH, School of Industrial Engineering and Management (ITM).
    Lennholm, H.
    Iversen, T.
    Pulp bleaching with dithionite: Brightening and darkening reactions1998In: Journal of Pulp and Paper Science, Vol. 24, no 8, p. 254-259Article in journal (Refereed)
  • 30.
    Lennholm, Helena
    et al.
    KTH, School of Industrial Engineering and Management (ITM).
    Lennholm, Helena
    Influence of molecular weight on mechanical properties of pulp fibers2000Conference paper (Refereed)
  • 31. Molin, U.
    et al.
    Lennholm, H.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH). KTH, Fibre- and Polymer technology.
    The influence of alkaline degradation during pulping on the mechanical properties of pulp fibres2001In: Appita Journal, Vol. 54, no 6, p. 540-546Article in journal (Refereed)
  • 32. Wickholm, K.
    et al.
    Hult, E. -L
    Larsson, P. T.
    Iversen, T.
    Lennholm, Helena
    KTH, Superseded Departments (pre-2005), Pulp and Paper Technology.
    Quantification of cellulose forms in complex cellulose materials: A chemometric model2001In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 8, no 2, p. 139-148Article in journal (Refereed)
    Abstract [en]

    In this paper, we present a chemometric model for quantifying the cellulose forms with different states of order found within cellulose I fibrils. The relative amounts of the different cellulose forms, that is crystalline cellulose I, para-crystalline cellulose and cellulose at accessible and inaccessible cellulose surfaces, were determined by non-linear least squares fitting of the C4-region in CP/MAS C-13-NMR (Cross-Polarisation Magic Angle Spinning Carbon-13 Nuclear Magnetic Resonance) spectra. By correlating these results from the C4-region with the full spectral data we obtained a model which is able to provide an assessment of the relative amounts of the different cellulose forms directly from NMR-spectra of complex lignocellulosic samples. Furthermore, this model enabled new assignments to be made in the C1-region for signals from cellulose at accessible fibril surfaces.

1 - 32 of 32
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