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A joint use of Raman and infrared spectroscopies for the identification of natural organic media used in ancient varnishes
Author(s) -
Daher Céline,
Paris Céline,
Le Hô AnneSolenn,
BellotGurlet Ludovic,
Échard JeanPhilippe
Publication year - 2010
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2693
Subject(s) - raman spectroscopy , infrared , chemistry , infrared spectroscopy , flowchart , analytical chemistry (journal) , polymer science , chromatography , organic chemistry , optics , computer science , physics , programming language
Abstract Various natural organic film‐making media from several chemical families have been used as varnishes. An improvement in the identification of these materials by a combination of Raman and infrared spectroscopies is presented here. Fourteen unaged reference samples representative of resins, glues, gums and oils were analyzed. FT‐Raman and infrared spectra were all compared in order to discriminate the different classes of organic media by considering their spectroscopic features. It led to a flowchart for material discrimination based on simple, notable and specific criteria. It appears that the different families (gums, glues, oils and resins) and subfamilies (di/triterpenoids resins) are easily differentiated thanks to their specific structural composition. However, differentiating between compounds from a same subgroup, for example diterpenoid resins, could be ambiguous because the spectra depend on the sample aspect, age and degradations. Copyright © 2010 John Wiley & Sons, Ltd.