Spectroscopic study of degraded woods from the Elbe river valley

Pavlíková, Helena; Sýkorová, Ivana; Černý, Jaroslav; Šebestová, E.; Machovič, Vladimı́r

doi:10.1021/ef00039a003

Cited by 9 publications

(4 citation statements)

References 3 publications

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“…This is in agreement with previous FT-IR spectroscopy studies of WAW (Pavlikova et al 1993;MacLeod and Richards 1997;Gelbrich et al 2008;Giachi and Pizzo 2009;Petrou et al 2009). Even though the analysed WAW did not have any intact S2, the carbohydrate contributions were still strong except for the band assigned to C = O stretch in unconjugated carbonyls at 1735 cm -1 (Schwanninger et al 2004), which was completely lost.…”

Section: Tracheids Decayed By Ebsupporting

confidence: 93%

Bacterial and abiotic decay in waterlogged archaeological Picea abies (L.) Karst studied by confocal Raman imaging and ATR-FTIR spectroscopy

2014

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Bacterial and abiotic decay in waterlogged archaeological Picea abies (L.) Karst studied by confocal Raman imaging and ATR-FTIR spectroscopyAbstract: Waterlogged archaeological Norway spruce [Picea abies (L.) Karst] poles were studied by means of confocal Raman imaging (CRI) and attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) analysis to determine lignin and polysaccharide composition and distribution in the cell wall. The waterlogged archaeological wood (WAW) was submerged under anoxic conditions for approximately 400 years and solely decayed by erosion bacteria (EB). CRI showed that decayed tracheids contain a residual material (RM) with heterogeneous lignin distribution; within the same tracheid RM often contained regions with intensities lower than sound S2 layers up to intensity values as high as the compound middle lamella (CML). CRI revealed strong depletion of carbohydrates in RM which indicated that EB are able to utilise the carbohydrate fraction of the cell wall effectively. Raman bands assigned to lignin did not show any difference between RM and sound S2. This is a hint that EB do not modify the lignin structure. Sound WAW free from EB decay showed evidence of loss of acetyl groups in glucomannan, loss of un-conjugated ester linkages in the lignin-carbohydrate complexes between xylan and lignin, and minor oxidation of the lignin polymer compared to recent reference material. This is evidence for abiotic decay in the course of waterlogging.

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Section: Tracheids Decayed By Ebsupporting

confidence: 93%

Bacterial and abiotic decay in waterlogged archaeological Picea abies (L.) Karst studied by confocal Raman imaging and ATR-FTIR spectroscopy

2014

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“…Hence the relative ratios of the heights of chosen peaks assigned to certain wood chemicals are used in comparative studies and therefore this method is usually described as semi-quantitative. Wood components show characteristic infrared absorption bands in a 'fingerprint' wave number region from about 1800 to 800 cm -1 , which can be used to diagnose the relative amounts of lignin, hemicellulose and cellulose [18], and thereby assist in assessing the extent of wood degradation [19,20]. However, one of the major problems associated with the analysis of FTIR spectra of archaeological wood samples is the incorporation of polyethylene glycol (PEG) in the wood matrix after conservation.…”

Section: X-ray Powder Diffraction (Xrd)mentioning

confidence: 99%

The Effects of the Ammonia Neutralizing Treatment on Marine ArchaeologicalVasaWood

Fors¹,

Richards²

2010

Studies in Conservation

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“…[29][30][31] By means of a diamond anvil cell it is possible to acquire semi-quantitative spectra related to the peak heights of certain wood components. Softwood and hardwood can be identified from their characteristic lignin components, and the content of lignin (Klason lignin structure) can be determined.…”

Section: ·2 Fourier-transform Infrared (Ft-ir) Spectroscopymentioning

confidence: 99%

“…the cellulose and in particular the hemicellulose, degrade much faster than lignin, which usually stays rather unaffected. 30,31,42 With solid state 13 C NMR that employs cross-polarization and magic-angle spinning (CP/MAS), structural and chemical differences between modern and archaeological wood can be studied both qualitatively and quantitatively. 31,43 For example, the resonance peaks from hemicellulose at ~21 and ~173 ppm were virtually absent in archaeological ligno-cellulosic material from Greece, indicating the degree and type of degradation (chemical lysis or biodeterioration).…”

Section: ·6 Nmr Spectroscopy and Cp/masmentioning

confidence: 99%