An analytical method based on pyrolysis in the presence of hexamethyldisilazane followed by gas chromatographic/mass spectrometric analysis, Py(HMDS)-GC/MS, was used for the first time to study birch bark tar, an adhesive that has been used since the Palaeolithic period. Py(HMDS)-GC/MS enabled us to obtain information simultaneously both on polymerised and solvent soluble fractions of birch bark tar. A very particular chromatographic pattern was obtained, which was mainly characterised by the presence of homologous series of linear saturated and unsaturated monocaboxylic fatty acids, and homologous series of straight-chain alkenes and alkanes. The pattern can be linked to suberin and suberan, which are known to be present in birch barks. In addition, lupane-type triterpenoids were also revealed. Py(HMDS)-GC/MS was initially applied to a reference material, and was then used to study the archaeological adhesives from a wooden spindle recovered in a Gallo-Roman burial (3rd century AD) and from the golden sheath of a Thracian dagger (8th-7th centuries BC) recovered in Belogradets (Bulgaria). (C) 2011 Elsevier B.V. All rights reserved.
|Autori:||Ribechini, Erika; Bacchiocchi, M.; Deviese, T.; Colombini, MARIA PERLA|
|Titolo:||Analytical pyrolysis with in situ thermally assisted derivatisation, Py(HMDS)-GC/MS, for the chemical characterization of archaeological birch bark tar|
|Anno del prodotto:||2011|
|Digital Object Identifier (DOI):||10.1016/j.jaap.2011.02.011|
|Appare nelle tipologie:||1.1 Articolo in rivista|