期刊
EUROPEAN BIOPHYSICS JOURNAL WITH BIOPHYSICS LETTERS
卷 47, 期 7, 页码 769-775出版社
SPRINGER
DOI: 10.1007/s00249-018-1290-6
关键词
Analytical ultracentrifuge; SEDFIT-MSTAR; Hydrogen peroxide-ultraviolet depolymerisation; Oseberg artefacts
类别
资金
- Norwegian Ministry of Education and Research
- University of Oslo
- UK EPSRC Centre for Doctoral Training award
The heterogeneity and molecular weight of a chitosan of low molecular weight (molar mass) and low degree of acetylation (0.1) for potential use as a consolidant for decayed archaeological wood were examined by sedimentation velocity and sedimentation equilibrium in the analytical ultracentrifuge before and after depolymerisation. Sedimentation velocity before depolymerisation revealed a uniform distribution of sedimentation coefficient with little concentration dependence. SEDFIT-MSTAR analysis revealed a weight average molecular weight M (w) of (14.2 +/- 1.2) kDa, and polydispersity index of similar to 1.2. Further analysis using MULTISIG revealed a distribution of material between 2 and 20 kDa and consistent with the weight average M (w). Controlled depolymerisation using hydrogen peroxide and ultra-violet radiation in an acetic acid medium reduced this to (4.9 +/- 0.7) kDa, with a similar polydispersity. The depolymerised material appears to be within the range that has been predicted to fully penetrate into archaeological wood. The consequences for this finding and the use of the analytical ultracentrifuge in wood conservation strategies are considered.
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