Studies of structure changes of archeological leather by FTIR spectroscopy / Yang Zhang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 5 (09-10/2018)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 102, N° 5 (09-10/2018) . - p. 262-267 Titre : Studies of structure changes of archeological leather by FTIR spectroscopy Type de document : texte imprimé Auteurs : Yang Zhang, Auteur ; Zifan Chen, Auteur ; Chengming Wang, Auteur ; Yong Tian, Auteur ; Decai Gong, Auteur Année de publication : 2018 Article en page(s) : p. 262-267 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antiquités (objets anciens) -- Analyse Collagène -- Détérioration Cuirs et peaux -- Analyse Cuirs et peaux -- Détérioration Essais accélérés (technologie) Fourier, Spectroscopie infrarouge à transformée de Tanins végétaux Tannage végétal Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Fourier transform infrared spectroscopy was used to investigate protein structures in new vegetable-tanned and artificially aged leather as well as in waterlogged archaeological leather dating from the Warring State Period (475BC-221BC). The obtained quantitative and qualitative information on protein structure changes was useful to characterize the deterioration of the archaeological leather during ageing in the buried environment. Compared with those in new vegetable-tanned leather, the amide A and amide II bands in the artificially aged and archaeological leather shifted to lower wavenumbers, suggesting hydrogen bonding in the collagen in the artificially and naturally aged leather was weakened. The estimation of the relative percentages of collagen secondary structures based on the peak area of component bands in the amide III showed that a-helix structure of collagen convertet into a random coil structure in the artificially aged and archaeological leather. Besides, the characteristic absorption peaks of tannins appeared in the spectra of all archaeological leather samples, but the tannins content decreased, indicating that tannins present in the archaeological leather could be degraded or detanned. The results showed that there was an increase in disorder structures in the collagen molecular structure and that the crosslinking between the tannins and collagen was disrupted in archaeological leather. This study will help us to elucidate the deterioration mechanism and guide the conservation of archaeological leathers. Note de contenu : - EXPERIMENTAL PROCEDURES : Samples - Accelerated ageing measurements - Instrumentation - RESULTS AND DISCUSSION : Analysis of FTIR spectra - Changes in collagen secondary structures - Degradation of vegetable tannins - Fig. 1 : FTIR spectra of new, artificially aged and archaeological leathers - Fig. 2 : Amide III curve-fitting spectra new vegetable-tanned leather, artificially aged leather, old 1 sqample, old 2 sample, old 3 sample - Fig. 3 : Comparison of the relative amount of secondary structures in amide III - Table 1 : FTIR spectra peak positions and assignments - Table 2 : Δv(vAl-vAll) and IR absorption ratio 1239/1450 cm-1 - Table 3 : Assignments and relative amounts of secondary structures in amide III En ligne : https://drive.google.com/file/d/182gmLMtHUQgbH95e42H2-UOWa1aB22-_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31113 [article]

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