Thermal characterization of new, artificially aged and historical leather and parchment

Sebestyén, Zoltán; Czégény, Zsuzsanna; Badea, Elena; Carsote, Cristina; Şendrea, Claudiu; Barta-Rajnai, Eszter; Bozi, János; Miu, Lucreţia; Jakab, Emma

doi:10.1016/j.jaap.2015.08.022

Cited by 60 publications

(34 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The formation mechanisms of these compounds were discussed in detail by Voorhees [33] and Fabbri et al [34]. As previously reported for leather and parchment [18], DKPs are formed from the four most abundant amino acid residues in collagen, i.e. glycine, proline, alanine, and hydroxyproline.…”

Section: Pyrolysis Resultsmentioning

confidence: 76%

“…Moreover, thermal destabilization occurred more rapidly for sheep leathers exposed to aging (namely, shrinkage temperatures decreased with a steeper slope) by compared to calf leathers regardless of the type of tannin [17]. On the other hand, it was established in our previous study by TG/MS and Py-GC/MS that the natural aging process of the tanned leathers can be explained by the degradation of the tanning agents beside the denaturation of collagen [18]. All these findings are consistent to the link-lock theory, according to which the shrinkage of collagen in leather depends on the ease with which the species, i.e.…”

Section: Introductionmentioning

confidence: 80%

“…Carbon dioxide (m/z 44) above 200 °C originates from the carboxylic groups of collagen and tannin. The intensive CO2 evolution from the tanning agent observed from 400 to 750 °C can be attributed to the secondary reactions of various oxygen-containing groups [18,29].…”

Section: Tg/ms Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Thermal degradation study of vegetable tannins and vegetable tanned leathers

Sebestyén

Jakab

Badea

et al. 2019

Journal of Analytical and Applied Pyrolysis

View full text Add to dashboard Cite

In this study, hydrolyzable tannins (commercial chestnut, valonea and tara extracts), condensed tannins (commercial quebracho and mimosa extracts) as well as calf leathers produced using these vegetable tanning agents were characterized by thermal decomposition methods using slow and high heating rates. Calf gelatin obtained by heating calf pelt in water at 70 ˚C was chosen as a reference material. Thermogravimetry/mass spectrometry (TG/MS) and pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) experiments were performed on the tannin and leather samples. The evolution profiles of the decomposition products as well as the thermal stability of tannins and leathers were studied by TG/MS. A net difference was observed in the thermal behavior of hydrolyzable and condensed tannins. The condensed tannins produced the highest char yield, while the hydrolyzable tara extract released the most volatile products. The tannins of higher reactivity produced more stable leathers as it results from their higher decomposition temperature. The composition of both vegetable tanned leathers and vegetable tanning agents was characterized by the pyrolysis product distribution measured by Py-GC/MS method. Resorcinol and its methylated derivative (orcinol) were found to be characteristic decomposition products for both condensed tannins, i.e. mimosa and quebracho. It was identified among the pyrolysis products of the mimosa and quebracho tanned leathers, as well. Characteristic decomposition product, a bisphenol derivative was identified among the pyrolyzates of hydrolyzable tannins and the leathers tanned with the hydrolyzable tannin agents.

show abstract

Section: Pyrolysis Resultsmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 80%

See 1 more Smart Citation

Thermal degradation study of vegetable tannins and vegetable tanned leathers

Sebestyén

Jakab

Badea

et al. 2019

Journal of Analytical and Applied Pyrolysis

View full text Add to dashboard Cite

show abstract

“…The 8% and 6% 5% and 4% rs exhibited a , the residues oss-section of section of all opening up post tanning o the fibers also in the of chromium of chromium e surface and rs, depending gnifications of ue leathers.  The release of aliphatic alkenyl and alkyl compounds occurs at higher temperatures, in the range 400-550 °C;  The formation of other molecular compounds occurs: toluene (at about 450 °C), ascribable to the scission of the side groups of phenylalanine, CO 2 and SO 2 , from 300 °C [12]. All these reactions justify the DTG shape between 200 °C and 550 °C, resulting from the overlapping of different decomposition rate peaks.…”

Section: Resultsmentioning

confidence: 94%

Eco-friendly Leather: Chromium Reduction in the Tanning Cycle

Salernitano¹,

Strafella²,

Roig³

et al. 2017

JESE-A

View full text Add to dashboard Cite

Abstract:The leather manufacturing is traditionally responsible for high environmental pollution. Tannery effluent contains, indeed, large amounts of lime sludge, sulfides, acids, toxic metals salts, in particular chromium salts, which are toxic, non-biodegradable and hardly disposable. For this reason, great research efforts are addressed to establish a significantly eco-sustainable and convenient business for companies and to produce high quality leather products. The replacement of current commercial chemical and toxic products with innovative natural/naturalized products and technologies in some crucial phases of the tanning cycle (mainly bating and defatting), can induce an eco-friendly reduction of the needed chromium amount. Leather samples, treated with innovative bating and defatting products and tanned by several different Cr contents, were characterized by SEM-EDS (Scanning Electron Microscopy equipped with Energy Dispersive X-Ray Spectroscopy) and TGA (Thermogravimetric Analysis). SEM-EDS was used to observe the surface and cross-section morphology and to provide a semi-quantitative elemental analysis, while TGA to evaluate the thermal stability and decomposition phases. The compatibility of the innovative products was demonstrated and the environmental impact of the process, performed by the effluents characterization, was effectively improved as a result of a 20% Cr lowering. The use of innovative products and the chromium reduction did not affect the thermal stability, leather morphology and not involve significant differences in the composition.

show abstract

“…Mozir et al studied degradation of historic parchment using small angle X‐ray scattering, synchrotron‐IR and PCA . Sebestyen et al combined PCA with thermal analysis in characterizing new, artificially aged and historical parchment and leather, finding that the tannin content of leather is more significantly affected by natural aging and alkaline treatment than the polypeptide chains …”

Section: Introductionmentioning

confidence: 99%

¹H NMR study and multivariate data analysis of reindeer skin tanning methods

Zhu

Ilott

Federico

et al. 2016

Magnetic Reson in Chemistry

View full text Add to dashboard Cite

Reindeer skin clothing has been an essential component in the lives of indigenous people of the arctic and sub-arctic regions, keeping them warm during harsh winters. However, the skin processing technology, which often conveys the history and tradition of the indigenous group, has not been well documented. In this study, NMR spectra and relaxation behaviors of reindeer skin samples treated with a variety of vegetable tannin extracts, oils and fatty substances are studied and compared. With the assistance of principal component analysis (PCA), one can recognize patterns and identify groupings of differently treated samples. These methods could be important aids in efforts to conserve museum leather artifacts with unknown treatment methods and in the analysis of reindeer skin tanning processes. Copyright © 2016 John Wiley & Sons, Ltd.

show abstract

Thermal characterization of new, artificially aged and historical leather and parchment

Cited by 60 publications

References 33 publications

Thermal degradation study of vegetable tannins and vegetable tanned leathers

Thermal degradation study of vegetable tannins and vegetable tanned leathers

Eco-friendly Leather: Chromium Reduction in the Tanning Cycle

¹H NMR study and multivariate data analysis of reindeer skin tanning methods

Contact Info

Product

Resources

About

Thermal characterization of new, artificially aged and historical leather and parchment

Cited by 60 publications

References 33 publications

Thermal degradation study of vegetable tannins and vegetable tanned leathers

Thermal degradation study of vegetable tannins and vegetable tanned leathers

Eco-friendly Leather: Chromium Reduction in the Tanning Cycle

1H NMR study and multivariate data analysis of reindeer skin tanning methods

Contact Info

Product

Resources

About

¹H NMR study and multivariate data analysis of reindeer skin tanning methods