Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

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Record number 495582
Title Matrix-free hydrodynamic study on the size distribution and conformation of three technical lignins from wood and non-wood
Author(s) Alzahrani, Q.E.; Adams, G.G.; Gillis, R.B.; Besong, T.M.D.; Kök, M.S.; Fong, Emily; Harding, R.A.; Dam, J.E.G. Van; Gosselink, R.J.A.; Rowe, A.J.; Harding, S.E.
Source Holzforschung 70 (2016)2. - ISSN 0018-3830 - p. 117 - 125.
DOI http://dx.doi.org/10.1515/hf-2014-0318
Department(s) FBR BP Biorefinery & Sustainable Value Chains
VLAG
Publication type Refereed Article in a scientific journal
Publication year 2016
Keyword(s) Alcell L - analytical ultracentrifugation - disc shape - DMSO - kraft L - soda L - viscometry
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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