| Title: |
Study of interactions between polyethylene glycol and archaeological wood components by 13C high-resolution solid-state CP-MAS NMR
|
| Issue: |
J Archaeol Sci 34 (10) |
| Series: |
Journal of Archaeological Science
|
| Volume: |
34
(10)
|
| Page Start/End: |
1670 - 1676 |
| Biblio Note |
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|
| Publication Type: |
Journal
|
| Abstract: |
The authors demonstrate that NMR is an useful analytical tool to characterize rapidly samples of conserved wooden objects. By choosing an appropriate value of the contact time (from 3 to 5 ms) for which the PEG component gives only a small residual NMR signal in the CP-MAS experiment, it is possible to edit selectively the spectra of the wood components. It allows one to visualize the degradation extent of the archaeological wood even when the conservation processes have been already applied. Moreover, by studying the kinetics of CP-MAS experiments, the time constants, T1ÏH and TCH values for PEG moiety were computed. From these data, it is shown that either in the crude commercial product or incorporated in archaeological woods, two components are present and they are the signatures of crystalline (or ordered) and amorphous (or disordered) molecular domains. Moreover, it was shown in the archaeological woods that almost 30% of PEG was in close molecular interactions with lignins. The study is evidence that the PEG in conserved wood can interact at a molecular level with wood components. It also demonstrates that the PEG diffuses inside the residual cell walls of archaeological wood. |
| Year of Publication: |
2007
|
| Subjects / Periods: |
| Cell Walls (Auto Detected Subject) |
| Wood (Auto Detected Subject) |
|
| Source: |
BIAB
(The British & Irish Archaeological Bibliography (BIAB))
|
| Relations: |
|
| Created Date: |
19 Sep 2007 |
