Analytical control of leather fat by near infrared reflectance spectroscopy / H. Iturriaga in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 2 (03-04/2007)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 91, N° 2 (03-04/2007) . - p. 47-51 Titre : Analytical control of leather fat by near infrared reflectance spectroscopy Type de document : texte imprimé Auteurs : H. Iturriaga, Auteur ; S. Maspoch, Auteur ; Trinitat Canals, Auteur ; D. Rey, Auteur Année de publication : 2007 Article en page(s) : p. 47-51 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bains de trempe -- Analyse Bains de trempe -- Teneur en matières grasses Cuirs et peaux de bovins Etalonnage Extraction par solvant Spectroscopie de réflectance Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A highly expeditious method for the direct analytical control of leather fat as an alternative to the officially endorsed methods was developed based on solvent extraction. The proposed method uses multivariate calibration with partial least-squares regression (PLSR) of diffuse reflectance spectra (NIRRS) for leather specimens. The reference values of the calibration matrix are used to derive those for powdered leather extracted with methylene chloride using the official method. Two different approaches based on matrices containing spectral information for powdered leather and spectra directly recorded on unpowdered leather samples were developed. The optimum calibration model for powdered samples is based on the second spectral derivative and 3 PLS components, and provides overall relative calibration and prediction errors in the region of 5%. On the other hand, the optimum prediction model uses the first spectral derivative and 5 PLS components; the results are similarly as good as those of the calibration model, but the prediction of some external samples results in larger errors arising from the inability to construct calibration sets encompassing the whole variability of the prediction set. Fibre optic-based NIR spectroscopy in combination with multivariate calibration appears to be an effective alternative to existing methods for the analysis and control of fat in the leather tanning industry as it is a rapid method and uses no reagents. Note de contenu : - EXPERIMENTAL PROCEDURES : Leather and fat-liquoring - Samples - Apparatus and software - Recording of NIR spectra - Processing of data - RESULTS AND DISCUSSION : Powdered sample method - Direct recording method - Table 1 : Fat content in the fat-liquoring baths and values provided by the reference method (RM) - Table 2 : Relative standard errors for the calibration and prediction sets as calculated using various calibration models for the powdered (p) and unpowdered (l) samples - Table 3 : Fat content in each calibration and external prediction sample as determined using both methods (p and l) En ligne : https://drive.google.com/file/d/1jRdhYSyPRuG-TxoFtUWG6VS8NNillbld/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39032 [article]

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Application of infrared spectroscopy (FTIR and NIR) in vegetable tanning process control / Trinitat Canals in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 97, N° 3 (05-06/2013)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 97, N° 3 (05-06/2013) . - p. 93-100 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 Quebracho Le 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 [article]

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