Study of deterioration of historical parchments by various thermal analysis techniques complemented by SEM, FTIR, UV-Vis-NIR and unilateral NMR investigations

Badea, Elena; Miu, Lucreţia; Budrugeac, P.; Giurginca, Maria; Mašić, Admir; Badea, Nicoleta; Gatta, Giuseppe Della

doi:10.1007/s10973-007-8513-x

Cited by 86 publications

(48 citation statements)

References 36 publications

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“…Probele au fost preparate prin mãcinarea a aproximativ 1 mg de piele cu 100 mg KBr ºi presarea amestecului în discuri foarte subþiri, care au fost scanate de 32 de ori. -1 Rezoluþia maximã a mãsurãtorilor a fost de 1 cm [16].…”

Section: Resultsunclassified

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Effect of UV Irradiation on Vegetable Tanned Leather

Gao¹,

Yang²,

Jian³

et al. 2015

LFJ

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EFFECT OF UV IRRADIATION ON VEGETABLE TANNED LEATHERABSTRACT. This article aims at studying the influence of UV irradiation on vegetable tanned leather. Vegetable tanned leather was treated in QUV chamber (T = 50°C, 2 irradiance = 1.77 W/mm nm, ë = 340 nm) for 0, 30, 60, 90, 120 and 150 hours. Then, these samples were evaluated by different analytical methods to get a whole UVA picture of the leather during the irradiation. Micro hot table (MHT), differential scanning calorimetry (DSC) and thermogravimetry (TG) were used to evaluate the influences of UV irradiation on thermal behaviors. Damages to mechanical properties were also analyzed by a standard method. Fourier transform infrared spectroscopy (FT-IR) and optical microscopy were used to investigate the changes of structural and histological properties during aging process. With the extension of aging time, thermal stability was gradually reduced to lower values, including shrinkage temperature, thermal denaturation temperature, associated enthalpy and temperature for maximum decomposition rate. In addition, mechanical properties such as tensile strength, tear strength and elongation at break also gradually decreased. The FT-IR results showed that, during the aging process, amide I and amide II band of the tanned collagen gradually shifted to lower numbers, indicating an increasingly serious damage to the structure of the peptide chain, that corresponds to obvious fibril breakages which are also detected through optical microscopy. KEY WORDS: UV irradiation, vegetable tanned leather, aging INFLUENÞA IRADIERII UV ASUPRA PIELII TÃBÃCITE VEGETAL REZUMAT. Acest articol urmãreºte studiul influenþei iradierii UV asupra pielii tãbãcite vegetal. Pielea tãbãcitã vegetal a fost tratatã în camera QUV (T = 50°C, iradiere 2 = 1,77 W/mm nm, ë = 340 nm) timp de 0, 30, 60, 90, 120 ºi 150 de ore. Apoi, aceste probe au fost evaluate prin diferite metode analitice pentru a obþine o imagine UVA de ansamblu a pielii în timpul iradierii. S-au utilizat microplaca încãlzitã (MHT), calorimetria cu scanare diferenþialã (DSC) ºi termogravimetria (TG) pentru a evalua influenþele iradierii UV asupra comportamentului termic. Deteriorarea proprietãþilor mecanice a fost, de asemenea, analizatã utilizând o metodã standard. S-au utilizat spectroscopia în infraroºu cu transformatã Fourier (FT-IR) ºi microscopia opticã pentru a investiga modificãrile proprietãþilor structurale ºi histologice în timpul procesului de îmbãtrânire. Cu prelungirea timpului de îmbãtrânire, stabilitatea termicã a fost redusã treptat la valori mai mici, inclusiv temperatura de contracþie, temperatura de denaturare termicã, entalpia asociatã ºi temperatura vitezei maxime de descompunere. În plus, proprietãþi mecanice precum rezistenþa la rupere, rezistenþa la sfâºiere ºi alungirea la rupere au scãzut treptat. Rezultatele FT-IR au arãtat cã, în timpul procesului de îmbãtrânire, benzile amidã I ºi amidã II ale colagenului tãbãcit s-au deplasat treptat la numere de undã mai mici, indicând o deteriorare mai serioasã a stru...

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Section: Resultsunclassified

“…Samples were prepared by grinding about 1 mg leather with 100 mg KBr and pressing the mixture into very thin disks and were scanned for 32 times. The maximum resolution of -1 measurements was 1 cm [16]. …”

Section: Optical Microscope Analysismentioning

confidence: 99%

Effect of UV Irradiation on Vegetable Tanned Leather

Gao¹,

Yang²,

Jian³

et al. 2015

LFJ

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“…These chemical processes can be characterized in FTIR spectra as differences in the relative intensity (AI/AII) and location (Δv) of the Amide I and II bands (Badea et al 2008). In the case of the Wager parka and N: 233, the degrees of oxidation and hydrolysis described by these classifications are nearly identical ( Table 2).…”

Section: Analysis To Explain the Colour Difference Between The Parkasmentioning

confidence: 99%

Conservation and Analysis on a Shoestring: Displaying Gut Parkas at the Polar Museum, Cambridge

Rowe

Ravaioli²,

Tully³

et al. 2018

Journal of Conservation and Museum Studies

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This paper presents a low-cost conservation project from the Polar Museum, Cambridge, in which two Inuit gut parkas from the museum's collection were prepared for display and analysed to identify their material components. The project relied on cultivating professional networks and adapting inexpensive mounting methods to get maximum value from a very small budget. The parkas were analysed with a range of techniques including scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX), attenuated reflectance Fourier transform infrared spectroscopy (ATR-FTIR) and a novel low-cost and nondestructive protein analysis technique to identify species. The results of the analysis are presented along with an explanation of the inexpensive mounting system which was devised to display the parkas as they were originally worn. The advantages and limitations of using a networking approach to analysis are also discussed.

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“…Moreover, the leather samples exposed to irradiation were then subjected to accelerated ageing to explore the long-term effect of gamma irradiation, too. Some of us have reported that denaturation of collagen induces modifications of the structure that can be followed by proton relaxation time determination [8,9]. This paper presents both T relaxation time, also called spin-1 lattice, and T spin-spin relaxation time measured 2 by the unilateral Nuclear Magnetic Resonance ( N M R ) t e c h n i q u e , t o e v a l u a t e t h e d o s e dependences of structural changes occurring in collagen within short-and long-time periods after gamma irradiation treatment.…”

Section: Materialementioning

confidence: 99%

“…Mai mult decât atât, probele de piele expuse la iradiere au fost apoi supuse la tratamente de îmbãtrânire acceleratã (40°C, UR 30% ºi 75%, alternând sãptãmânal umiditatea relativã (UR) între 30% ºi 75%, timp de 12 sãptãmâni) pentru a explora efectul pe termen lung al iradierii. Unii dintre autorii lucrãrii au arãtat cã denaturarea colagenului în pergament ºi piele induce modificãri ale structurii care pot fi relevate prin determinarea timpului de relaxare a protonilor apei legate din structura acestor materiale [8,9]. Lucrarea de faþã prezintã variaþia valorilor timpului de relaxare spin-reþea, T , ºi a timpului de relaxare spin-spin, T , 1 2 mãsuraþi prin tehnica de rezonanþã magneticã nuclearã (RMN) unilateralã, în funcþie de doza de radiaþii gama aplicatã ºi de efectul tratamentului de îmbãtrânire artificialã.…”

Section: Introductionunclassified

Dose-Dependent Effects of Gamma Irradiation on Collagen in Vegetable Tanned Leather by Mobile NMR Spectroscopy

Şendrea¹,

Badea²,

Stănculescu³

et al. 2015

LFJ

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ABSTRACT. The dose dependent effect of gamma irradiation on collagen in vegetable tanned leather was studied by unilateral nuclear magnetic resonance (NMR). Examination of the irradiated samples after 1 week of treatment revealed variations of both spin-lattice (T ) and spin-spin (T ) proton relaxation times. To evaluate 1 2 the long-term effects of gamma irradiation, the irradiated samples were further exposed to accelerated ageing at 40°C and weekly alternate 30% and 75% relative humidity (RH) for 12 weeks. The synergistic action of temperature and relative humidity caused distinct variations of both T and T relaxation times suggesting 1 2 distinct modifications within the collagen fibril structure. Structural variations were attributed to cross-linking, the prevalent pattern at 25 kGy dose, while polypeptide chain scission was shown to be prevailing at higher doses. KEY WORDS: collagen, vegetable tanned leather, gamma irradiation, unilateral NMR STUDIUL EFECTULUI DOZEI DE RADIAÞII GAMMA ASUPRA COLAGENULUI DIN PIELEA TÃBÃCITÃ VEGETAL UTILIZÂND SPECTROSCOPIA RMN REZUMAT. S-a studiat efectul dozei de iradiere gamma asupra colagenului din pielea tãbãcitã vegetal prin rezonanþã magneticã nuclearã unilateralã (RMN). Examinarea probelor iradiate dupã 1 sãptãmânã de tratament a indicat variaþii atât ale timpilor de relaxare a protonilor spin-reþea (T ), cât ºi a celor spin-spin (T ). Pentru a evalua efectele pe termen lung ale iradierii gamma, probele iradiate au fost expuse în continuare la îmbãtrânire acceleratã la 40°C ºi s-a alternat sãptãmânal umiditatea relativã (UR) în intervalul 30%-75% timp de 12 sãptãmâni. Acþiunea sinergicã a temperaturii ºi umiditãþii relative a produs modificãri distincte ale timpilor de relaxare T ºi T , sugerând modificãri distincte în structura fibrilelor de colagen. Pânã la doze de 25 kGy mecanismul predominant a fost reticularea, în 1 2 timp ce la doze mai mari a predominat scindarea lanþului polipeptidic. CUVINTE CHEIE: colagen, piele tãbãcitã vegetal, iradiere gamma, RMN unilateralã L'EFFET DE L'IRRADIATION GAMMA SUR LE COLLAGÈNE DU CUIR À TANNAGE VÉGÉTAL EN UTILISANT LA SPECTROSCOPIE RMN RÉSUMÉ.On a étudié l'effet de la dose d'irradiation gamma sur le collagène du cuir à tannage végétal par la résonance magnétique nucléaire unilatérale (RMN). L'analyse des échantillons irradiés après 1 semaine de traitement a montré des variations des temps de relaxation des protons spin-réseau (T ) et spin-spin (T ). Pour 1 2 évaluer les effets à long terme de l'irradiation gamma, les échantillons irradiés ont été davantage exposés à un vieillissement accéléré à 40°C et on a modifié chaque semaine l'humidité relative (HR) entre 30% à 75% pendant 12 semaines. L'action synergique de la température et l'humidité relative ont produit des changements distincts dans les temps de relaxation T et T , ce qui suggère des changements distincts dans la structure des fibrilles de collagène. À la dose de 25 kGy le mécanisme 1 2 prédominant était la réticulation, tandis qu'aux doses plus élevées le clivage de ...

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Study of deterioration of historical parchments by various thermal analysis techniques complemented by SEM, FTIR, UV-Vis-NIR and unilateral NMR investigations

Cited by 86 publications

References 36 publications

Effect of UV Irradiation on Vegetable Tanned Leather

Effect of UV Irradiation on Vegetable Tanned Leather

Conservation and Analysis on a Shoestring: Displaying Gut Parkas at the Polar Museum, Cambridge

Dose-Dependent Effects of Gamma Irradiation on Collagen in Vegetable Tanned Leather by Mobile NMR Spectroscopy

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