Studies on the effects of mixed light-thermal ageing on parchment by vibrational spectroscopy and micro hot table method

Cappa, Federica; Paganoni, Ilaria; Carsote, Cristina; Badea, Elena; Schreiner, Manfred

doi:10.1186/s40494-020-0353-z

Cited by 24 publications

(18 citation statements)

References 39 publications

(67 reference statements)

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“…The loosening and then breaking of collagen-tannin interactions during burial is also suported by the changes in the amide II band, namely the shift of the amide II component at 1550 cm −1 (α-helix) towards lower wavenumbers (1546-1538 cm −1 ) accompanied by a progressive depletion of the complex band at 1502-1515 cm −1 [38,52,55]. In case of CH leather samples, the intensity of the 1660 cm −1 component (α-helix) decreased while the intensity of the 1628 cm −1 component (gelatine) increased [37,38,40,55]. This behaviour, explained by the unfolding of the native triple helix structure and conversion to gelatin, confirms the gelatinisation of CH leather revealed by the dramatic decrease of T f evidenced through the MHT method.…”

Section: Effects Of Leather Burial On Molecular Alteration Of Collage...mentioning

confidence: 99%

“…In the last two decades, shrinkage temperature has been widely used as a metric for damage in old leather and parchment [23,[30][31][32][33] as well as to study the effects of various ageing or conservation treatments on leather and parchment [34][35][36][37][38]. Some of us have reported how leather hydrothermal stability, expressed as T f and T s , and structural cohesivity and heterogeneity, expressed as ΔC and ΔT, respectively, correlates with natural or artificially induced ageing patterns [18,25,33].…”

Section: Effects Of Leather Burial On Collagen Shrinkage Activity By ...mentioning

confidence: 99%

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Burial-induced deterioration in leather: a FTIR-ATR, DSC, TG/DTG, MHT and SEM study

Vyskočilová

Carsote²,

Ševčík

et al. 2022

Herit Sci

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In this study we used an analytical approach based on complementary techniques that targets all structural levels of collagen in leather to investigate how vegetable-tanned leather deteriorates during soil burial tests. For the first time, a group of deterioration markers specific to molecular, fibrillar and fibrous structure of collagen in leather was associated with the deterioration of buried leather. The application of the second order derivative of FTIR-ATR spectra analysis allowed us to detect loosening of collagen–tannin matrix, de-tanning and gelatin formation based on the behaviour of collagen and tannin spectral components (intensity variation and shifts). Collagen denaturation observed by DSC analysis and its thermo-oxidative behaviour measured by TG/DTG analysis, as well as the altered morphology of collagen (namely melt-like fibres and distorted fibrillar ultrastructure) imaged by SEM confirmed the FTIR-ATR analyis results. These analytical outcomes enabled us to understand the effect of leather hardening/cementing through soil mineral penetration into its fibrous structure and thus correctly interprete the higher-than-expected shrinkage temperatures and intervals determinatd by MHT method. Thus, MHT method proved to be suitable for a quick evaluation method that can direcly support the first conservation decision after excavation. The combination of FTIR-ATR, DSC, TG/DTG and SEM can be particularly useful to provide insights on the deterioration mechanism of archaeological leather and support best decision on its long-term preservation.

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Section: Effects Of Leather Burial On Molecular Alteration Of Collage...mentioning

confidence: 99%

Section: Effects Of Leather Burial On Collagen Shrinkage Activity By ...mentioning

confidence: 99%

Burial-induced deterioration in leather: a FTIR-ATR, DSC, TG/DTG, MHT and SEM study

Vyskočilová

Carsote²,

Ševčík

et al. 2022

Herit Sci

Self Cite

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“…Six diferent replicates of each sample were measured and averaged before data preprocessing. Opus 7.0 software (Bruker Optics, Germany) was used for the acquisition and elaboration of the spectra, while their graphic presentation was done with Origin 7.5 software [39][40][41].…”

Section: Fourier Transform Infrared Spectroscopy In Attenuated Total Re Ection Mode (Ftir-atr)mentioning

confidence: 99%

Burial-Induced Deterioration in Leather – A FTIR-ATR, DSC, TG/DTG, MHT and SEM study

Vyskočilová

Ševčík

Carsote

et al. 2021

Preprint

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In this study we used an analytical approach based on complementary techniques that targets all structural levels of collagen to investigate the effects of burrial tests on vegetable-tanned lather. For the first time, a group of deterioration markers specific to molecular, fibrillar and and fibrous structure of collagen in leather was associated with the anaerobic condition of burried leather. Gelatin was identified both through the FTIR-ATR spectral markers (molecular alteration of collageneous triple helix structure) and SEM imaging (alteration of fibrils and fibres morphology). Loosening of collagen-tannin interaction and de-tanning were detected by the application of second derivative spectral analysis. Collagen denaturing profile was evidenced by DSC analysis and documented by SEM observations at high magnification, while TG/DTG analysis gave information on the leather thermo-oxidative deterioration. Our results confirmed that the shrinkage temperature measured by MHT method could be misleading. However, this method proved its usefulness in assessing the structural inhomogeneity of collagen in buried leather and identifying gelatin. The complementary FTIR-ATR, DSC, TG/DTG, MHT and SEM analytical protocol proved its high effectiveness and could thus be extended to the challenging study of archaeological leather.

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“…Several micro-destructive or non-invasive methods can be used to analyse parchment such as the micro hot table method [23], NMR and thermal microscopy [24] or polarised light microscopy [25].…”

Section: Introductionmentioning

confidence: 99%

Possible modifications of parchment during ion beam analysis

et al. 2022

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Ion beam analysis (IBA) is an established method to determine the concentration and the distribution of elements in art and archaeological objects. However, especially for organic specimens, caution must be taken to avoid harmful effects. In this work, the possible modification of recent calf parchment samples by proton beam irradiation was investigated applying fluences (given as deposited charge per unit area) both within and beyond the usual analytical practice. Attenuated Total Reflection Fourier Transform Infra-red Spectroscopy (FTIR-ATR) and Optical Coherence Tomography (OCT) were employed to assess changes, inspected from the surface of the samples. Although both techniques are apt to detect alterations of parchment in general, in the case of particles, which deposit the majority of their energy below the surface these techniques could not detect changes at low fluences. However, a simple “bath test” (short immersion in liquid) proved that disintegration within the material had already happened. After the “bath test”, OCT and digital 3D microscopy were used to check the discontinuities in the material, especially for low fluences when the visual inspection might have missed them. Unfortunately, simply monitoring organic objects such as parchment during or after ion beam irradiation, non-destructively, is not sufficient to claim absolute harmlessness, as some studies in the past did. In line with our former findings using electron microscopy on cross sections, we found that 2.3 MeV protons with a deposited charge of 0.5 µC/cm2 caused no changes affecting the integrity of parchment but 2 µC/cm2 apparently did under the applied experimental conditions. To ensure the required analytical signal at a relatively low deposited charge, the detection system must be optimized for efficiency. Nevertheless, since the variability of the historic materials and the measurement set-ups are considerable, these values cannot be taken as absolutes, but only as guides, both for further IBA studies and for studies conducted in the past.

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Studies on the effects of mixed light-thermal ageing on parchment by vibrational spectroscopy and micro hot table method

Cited by 24 publications

References 39 publications

Burial-induced deterioration in leather: a FTIR-ATR, DSC, TG/DTG, MHT and SEM study

Burial-induced deterioration in leather: a FTIR-ATR, DSC, TG/DTG, MHT and SEM study

Burial-Induced Deterioration in Leather – A FTIR-ATR, DSC, TG/DTG, MHT and SEM study

Possible modifications of parchment during ion beam analysis

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