Matrix-free hydrodynamic study on the size distribution and conformation of three technical lignins from wood and non-wood
-
Qushmua E. Alzahrani
, Gary G. Adams , Richard B. Gillis , Tabot M.D. Besong , M. Samil Kök , Emily Fong , Richard A. Harding , Jan E.G. van Dam , Richard J.A. Gosselink, Arthur J. Rowe
and Stephen E. Harding
Abstract
Molecular weight (MW) and related conformational data of three commercially available technical lignins (Alcell L, kraft L, and soda L) have been studied by means of analytical ultracentrifugation, taking advantage of some recent developments in both sedimentation velocity and sedimentation equilibrium determinations. The lignins were dissolved in dimethyl sulphoxide (with ca. 90% solubility), and solutions were studied with regards to their oligomeric state, heterogeneity profiles (distribution of sedimentation coefficients), and molecular weight distributions (MWD). Alcell L and soda L have similar properties showing one major low MW component and two minor high MW components, whereas kraft L appears to be larger and more uniform, i.e., it shows a more monodisperse MWD. Weight average molecular weight (Mw) data from sedimentation equilibrium obtained by the new SEDFIT-MSTAR procedure in conjunction with MULTISIG analysis were found to be ~18 kDa (Alcell L), 25 kDa (kraft L), and 15 kDa (soda L). Further analysis of the data by means of the routines MULTISIG and M_INVEQ confirmed the presence of additional components in Alcell L and soda L, and the larger size and high degree of monodispersity of kraft L. The intrinsic viscosity data of the three lignins were found to be very similar in the range of 22–24 ml g-1, and all data were consistent with an elongated plate shape molecular structure with an equivalent discoid aspect ratio ~30.
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©2016 by De Gruyter
Articles in the same Issue
- Frontmatter
- Original Articles
- Structural analysis of hardwood native lignins by quantitative 13C NMR spectroscopy
- A light-colored hydroxypropyl sulfonated alkali lignin for utilization as a dye dispersant
- Matrix-free hydrodynamic study on the size distribution and conformation of three technical lignins from wood and non-wood
- Testing three proposed DNA barcodes for the wood identification of Dalbergia odorifera T. Chen and Dalbergia tonkinensis Prain
- Capillary pore-size distribution and equilibrium moisture content of wood determined by means of pressure plate technique
- Measurement of moisture-related strain in bonded ash depending on adhesive type and glueline thickness
- The cellular level mode I fracture behaviour of spruce and birch in the RT crack propagation system
- Assessment of wood microstructural changes after one-stage thermo-hydro treatment (THT) by micro X-ray computed tomography
- Failure and failure mechanisms of wood during longitudinal compression monitored by synchrotron micro-computed tomography
Articles in the same Issue
- Frontmatter
- Original Articles
- Structural analysis of hardwood native lignins by quantitative 13C NMR spectroscopy
- A light-colored hydroxypropyl sulfonated alkali lignin for utilization as a dye dispersant
- Matrix-free hydrodynamic study on the size distribution and conformation of three technical lignins from wood and non-wood
- Testing three proposed DNA barcodes for the wood identification of Dalbergia odorifera T. Chen and Dalbergia tonkinensis Prain
- Capillary pore-size distribution and equilibrium moisture content of wood determined by means of pressure plate technique
- Measurement of moisture-related strain in bonded ash depending on adhesive type and glueline thickness
- The cellular level mode I fracture behaviour of spruce and birch in the RT crack propagation system
- Assessment of wood microstructural changes after one-stage thermo-hydro treatment (THT) by micro X-ray computed tomography
- Failure and failure mechanisms of wood during longitudinal compression monitored by synchrotron micro-computed tomography