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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