[article]
| Titre : |
Application of infrared spectroscopy (FTIR and NIR) in vegetable tanning process control |
| Type de document : |
texte imprimé |
| Auteurs : |
Trinitat Canals, Auteur ; Josep Maria Morera, Auteur ; Felipe Combalia, Auteur ; Esther Bartoli, Auteur |
| Année de publication : |
2013 |
| Article en page(s) : |
p. 93-100 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Fourier, Spectroscopie infrarouge à transformée de
Mimosa et constituants
Qualité -- Contrôle
QuebrachoLe quebracho est un arbre à écorce ligneuse, mesurant 30 mètres de haut, à feuilles tannées et à fleurs tubulées blanches.
Quebracho est l'un des noms communs, en espagnol, d'au moins trois espèces similaires d'arbres originaires du Gran Chaco, en Amérique latine : Schinopsis lorentzii (quebracho colorado santiagueño), de la famille des Anacardiaceae ; Schinopsis balansae (quebracho colorado chaqueño), de la même famille ;
Aspidosperma quebracho-blanco (quebracho blanc), de la famille des Apocynaceae.
Ces trois espèces sont riches en tanin et fournissent un bois très dur, particulièrement résistant. Leur nom provient de l'espagnol quiebrahacha, qui signifie brise-hache.
Réflexion totale atténuée
Spectroscopie infrarouge proche
Tannage végétal -- Analyse
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
The tanning industry is currently influenced by the globalization of international markets. Competitiveness among industries has increased substantially. This therefore results in the need to further control the tanning processes in order to adjust each process thus preventing potential manufacturing errors. To avoid compromising production, controls must be performed in the least possible time.
In the case of vegetable-tanned leather the official method for determining the `degree of tannage' or `connbined tannins' parameters is not directly from a single standardized test method. The procedure to obtain these parameters involves performing several independent analyses and these present several drawbacks. The process is slow, involves the use of pollutants and the reproducibility of results depends on the experience of the analysts who perform the test. Consequently, the determination is infeasible in some cases.
Our work aims to develop a new analytical method for determining the tanning degree and the parameters associated with its calculation (combined tannins, hide substance and leather substance) of leathers tanned with vegetable extracts in order to solve this problem. We prepared a wide group of leathers for this purpose, tanned with a mixture of vegetable extracts (mimosa and quebracho) and having different values of the degree of tannage. lnitially, the spectra of leather samples were recorded by Fourier-Transform Mid-Infrared Spectroscopy (FTIR) and Attenuated Total Reflectance cell (ATR). They were also recorded with Near Infrared Reflectance Spectroscopy (NIR) using a fibre optic module. The subsequent mathematical treatment of spectral signais by a Partial Least Squares Regression (PLSR) chemometric method enabled the calculation of the parameters studied.
The analytical method proposed has several advantages over the traditional method. It enables direct leather analysis, without any manipulation, in a very short time and without using chemicals. Finally, this method allows systematic, fast and easy process control at a very low cost. Good results were obtained with both spectroscopic techniques used, when compared with those obtained by the traditional analysis. |
| Note de contenu : |
- EXPERIMENTAL PROCEDURES : Apparatus, software and reagents - Methodology - Recording of FTIR and NIR spectra - Processing of data
- RESULTS AND DISCUSSION : Introduction - Quantification of vegetable leather samples from FTIR spectra - Quantificationof vegetable leather samples from NIR spectra - Analytical method proposed to control production |
| En ligne : |
https://drive.google.com/file/d/1ljDF37TWgxKPSfgVfXaOH8K0VP8Y5Wti/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18836 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 97, N° 3 (05-06/2013) . - p. 93-100
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