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Determination of 2-(thiocyanomethylthiol)benzothiazole and 2-mercaptobenzothiazole in chrome tanning liquors using derivative absorption spectra and partial least squares regression / Laura Hinojosa Reyes in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 2 (02/2002)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVII, N° 2 (02/2002) . - p. 57-64 Titre : Determination of 2-(thiocyanomethylthiol)benzothiazole and 2-mercaptobenzothiazole in chrome tanning liquors using derivative absorption spectra and partial least squares regression Type de document : texte imprimé Auteurs : Laura Hinojosa Reyes, Auteur ; Katarzyna Wrobel, Auteur ; Kazimierz Wrobel, Auteur Année de publication : 2002 Article en page(s) : p. 57-64 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In this work, two chemometric approaches were used for the simultaneous determination of 2-(thiocyanomethylthiol)benzothiazole(TCMBT) and 2-mercaptobenzothiazole(MBT) in chrome tanning liquors, by extraction - UV/Vis spectrophotometry. The experimental procedure was as follows: take 100 ml of the sample, add 50 ml of acetonitrile and 100 ml of 2 M phosphoric acid (final pH 2), extract the two analytes with 750 ml of ethyl acetate and measure the absorption spectra in the wavelength range 280 - 350 nm. The calibration solutions contained 100 ml of the fungicide - free liquor for matrix matching. These same absorption spectra were used for the univariate third derivative approach and for the method PLS2. There was no statistically significant difference between the results of the two proposed procedures and HPLC results (ANOVA, p < 0.05), indicating that the two chemometric approaches coupled to extraction - spectrophotometric measurement can be recommended as a good alternative for the chromatographic method. The important advantages of the proposed procedures are their simplicity, low consumption of reagents and the high speed of the analysis: using PLS2 approach, the response for the two compounds in the concentration units corresponded to liquor sample is obtained within less than 5 min from sample collection. En ligne : https://drive.google.com/file/d/1fbECehP9oY40qQak0gW2zRrZshLe_UoG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4324 [article]

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Marketing exotic leather : American alligator, ostrich, and emu / Bonnie D. Belleau in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 2 (02/2002)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVII, N° 2 (02/2002) . - p. 65-73 Titre : Marketing exotic leather : American alligator, ostrich, and emu Type de document : texte imprimé Auteurs : Bonnie D. Belleau, Auteur ; Terri Von Hoven, Auteur ; Teresa A. Summers, Auteur Année de publication : 2002 Article en page(s) : p. 65-73 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The exotic leather market is steadily increasing, fueled by fashion demand. Several types of skins: ostrich, emu, and American alligator have become popular as a material for fashion apparel and interiors products. Historically, the domestic market for exotic leather has been limited to menswear and western boots. However, with the recent fashion emphasis, exotics have become popular with fashion consumers. Many designers and manufacturers are selecting ostrich, emu, and American alligator for apparel and interiors products. As a result of increased popularity and use, there is a critical need for baseline information so the industry can effectively market exotic leather products. It is important for designers, manufacturers, and retailers to have access to this type of information. This research project involved an "umbrella" approach to the challenge of strengthening and expanding the domestic exotic leather market. Included in this study were: consumer surveys, manufacturer/designer surveys, and some physical property testing. En ligne : https://drive.google.com/file/d/12Esf8mEWieC9pxODYQGE6dfxVCQyTHrd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4325 [article]

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Recent advances in collagen based technologies / Gennaro J. Maffia in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 2 (02/2002)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVII, N° 2 (02/2002) . - p. 74-82 Titre : Recent advances in collagen based technologies Type de document : texte imprimé Auteurs : Gennaro J. Maffia, Auteur ; Maria Slomiana, Auteur ; John F. Davis Année de publication : 2002 Article en page(s) : p. 74-82 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Collagen dispersions, produced from ground bovine corium, have a remarkable water retention capability. This property has lead to research on applications in environmental remediation, biotechnology, biomedical engineering, and materials of construction. Widener researchers and collaborators are studying specific applications in all of these areas. Within the past year, research has focused on three areas: dispersion rheology, weighted and magnetic matrices (especially microspheres), and building materials. Initial results are promising in each of these focus areas, although the production technology remains long and labor intensive. Collagen dispersions take a minimum of two weeks to prepare and crosslinked matrices can take as long as two months. Future research is ongoing to further develop the potential applications and to scale-up and shorten the production process. En ligne : https://drive.google.com/file/d/1LPDpJld7BR9EZ8K-E4bYOuntTcTYW5UU/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4326 [article]

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Development of a tanning process based on using hydrolyzated material collected from leather scrap / J. Muñoz in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 2 (02/2002)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVII, N° 2 (02/2002) . - p. 83-88 Titre : Development of a tanning process based on using hydrolyzated material collected from leather scrap Type de document : texte imprimé Auteurs : J. Muñoz, Auteur ; M. Maldonado V., Auteur ; A. Rangel-Serrano, Auteur Année de publication : 2002 Article en page(s) : p. 83-88 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Wet blue leather shavings are considered a waste material and represents between 6 to 12 % of the green, salted leather total weight. In practice it is usually combined with trimmings. This scrap is considered "hazardouswaste", due to the possibility of its chrome type III content (3 to 4%) converting into chrome(VI). Therefore, they are collected and confined only in authorized pits, which imposes extra expenditures upon manufacturers. Consequently, it is not rare for such waste to be clandestinely disposed. In this work, wet blue leather scraps were treated under acidic conditions (using sulphuric acid) at temperatures above 93 °C, until soluble chromium was obtained, together with protein hydrolyzed material(HA). HA showed a 2.3 g/l of chromium oxide content, and 16.2 g/l of total nitrogen. The HA chromium oxide value was raised to 6%, and it was used as a retanning agent for split leather, beginning at a pH value of 2.5 and ending at 3.5. HA was then compared to a standard process (ST) of 6% of chromium oxide, and a 2.5 pH value. Split leather retanned with HA showed 3.2 %, of chromium oxide versus 3.7% with ST, while total nitrogen content was 11.5% with HA, being 10.0% for ST. Physical properties of split leather retanned with HA, compared to those of leather from standard process, showed a shrink temperature of up to 100 °C, and split leather texture showed better softness and aspect. A benefit of 50% was then calculated for hydrolyzate protein, with savings between 15 and 20% in chromium oxide usage, an increase of 30% in tear strength, a reduction of 10% in elongation, and 30% increase in tensile strength. From an environmental point of view, these results provide an alternative for treatment and use of wet blue leather scraps, which in turn will allow an MOXICO. increased efficiency in reusing byproducts from the leather tanning process. En ligne : https://drive.google.com/file/d/1jK3ooNeUKVx2yIe-7Nz1WQZm0gWsQgxB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4327 [article]

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