Details

Autor(en) / Beteiligte

• Daher, Céline
• Paris, Céline
• Le Hô, Anne-Solenn
• Bellot-Gurlet, Ludovic
• Échard, Jean-Philippe

Titel

A joint use of Raman and infrared spectroscopies for the identification of natural organic media used in ancient varnishes

Ist Teil von

• Journal of Raman spectroscopy, 2010-11, Vol.41 (11), p.1494-1499

Ort / Verlag

Chichester, UK: John Wiley & Sons, Ltd

Erscheinungsjahr

2010

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• 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. The identification of natural organic reference materials representative of resins, glues, gums and oils is proposed by the joint use of vibrational spectroscopies. The combination of FT‐Raman spectroscopic features with IR ones succeeded in building an algorithm that identifies and discriminates between the different media. It is shown that the different families (gums, glues, oils and resins) and subfamilies (di/triterpenoids) are easily differentiated.