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Exploring a role in tanning for the gap region of the collagen fibril : catechin-collagen interactions / Eleanor M. Brown in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 9 (09/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 9 (09/2008) . - p. 290-297 Titre : Exploring a role in tanning for the gap region of the collagen fibril : catechin-collagen interactions Type de document : texte imprimé Auteurs : Eleanor M. Brown, Auteur ; Phoebe X. Qi, Auteur Année de publication : 2008 Article en page(s) : p. 290-297 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Electron micrographs of stained collagen fibrils display a pattern of alternating light and dark bands perpendicular to the axis of the collagen fibril. Light bands correspond to regions of more dense lateral packing where adjacent collagen monomers overlap and dark bands correspond to 'gap' regions, domains of low-density molecular packing. Most studies of artificially stabilized collagen focus on crosslinks that utilize specific amino acid side chains, without considering whether these are more likely to be located in overlap or gap regions. The gap region with its lower molecular density, greater length, and available telopeptides appears promising as an area able to accommodate oligomeric compounds that are the typical tanning agents. This study uses the ERRC collagen microfibril model to explore the interactions of catechin, a model for vegetable tanning agents thought to interact with serine residues, in the collagen microfibril. Attempts at placing catechin near serine residues in the gap region of the microfibril and subjected to conditions typical of tanning. Under these simulated conditions each catechin molecule moved into a position where intermolecular stabilizing interactions were likely, although not with sering. The method will be valuable in predicting the effectiveness of proposed new tanning agents. En ligne : https://drive.google.com/file/d/1xP9BzPTM4FZdEKGyxqdWX2Lx_-aXij6Y/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2511 [article]

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Pertraction of Cr(III) from modeling exhaustion tanning bath with a bulk liquid membrane / P. Religa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 9 (09/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 9 (09/2008) . - p. 298-302 Titre : Pertraction of Cr(III) from modeling exhaustion tanning bath with a bulk liquid membrane Type de document : texte imprimé Auteurs : P. Religa, Auteur ; P. Gierycz, Auteur Année de publication : 2008 Article en page(s) : p. 298-302 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The influence of chloride and sulfate ions as well as the age of the model test solution of the "tanning liquor" on the effectiveness of the chromium(III) pertraction with the use of a bulk liquid membrane has been investigated. Introducing So2- 4 to the chromium solution causes the creation of stable sulfate complexes that limit the transport capacities of the investigated system with the liquid membrane. the presence of chlorines in the solution does not considerably influence the effectiveness of chromium(III) extraction stripping. As a results restrict the direct application of liquid membranes for the pertraction of chromium from tanning liquors. En ligne : https://drive.google.com/file/d/146zSGL3VmFQWbLF_QmhInsQTh9pyCWMj/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2512 [article]

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Performance and eco-impact of reverse processed hair sheep gloving leather / Subramani Saravanabhavan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 9 (09/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 9 (09/2008) . - p. 303-313 Titre : Performance and eco-impact of reverse processed hair sheep gloving leather Type de document : texte imprimé Auteurs : Subramani Saravanabhavan, Auteur ; Palanisamy Thanikaivelan, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2008 Article en page(s) : p. 303-313 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather processing, the world over, follows the pretanning, tanning, post-tanning and finishing sequence. It involves manyu process steps and huge pH variations thus discharges enormous amount of pollutants. A prudent analysis of the conventional leather process shows that the sequence follows do-undo logic. In this study, the conventional proccessing sequence has been reversed to reduce the number of process steps and pH variations thereby achieving resource and polution reductions. Hair sheepskins have been processed using both conventional and reverse processes for gloving application. Reverse process involves pretanning, post tanning, tanning and finishing sequence. The pH and charges of skin matrix after deliming are wisely utilized to apply post-tanning chemicals followed by chrome tanning salt the processed leathers have been analyzed for chromium content, shrinkage temperature, strength and bulk properties. A set of turn-key tests have been carried out to verify whether the reverse processedleathers meet military specifications. The performance of reverse processed glove leathers is shown tobe on par with conventionally processed leathers and meet the specifications predominantly. Especially, chrome content of reverse processed leathers is higher than control leather, which is corroborated through X-ray fluorescence analysis. The process enjoys significant reduction in COD and TS loads by 53 and 70%. Also, the process benefits from significant reductions in water, wastewater discharge, chemicals, time, power and cost compared to conventional process. En ligne : https://drive.google.com/file/d/1N6_bpTXaHI3bO3Nz8ElTo5Gtg5uX1Cw1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2513 [article]

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The influence of thermal crosslinking on solubility of films prepared from collagen hydrolysate / Pavel Mokrejs in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 9 (09/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 9 (09/2008) . - p. 314-322 Titre : The influence of thermal crosslinking on solubility of films prepared from collagen hydrolysate Type de document : texte imprimé Auteurs : Pavel Mokrejs, Auteur ; F. Langmaier, Auteur ; Dagmar Janacova, Auteur Année de publication : 2008 Article en page(s) : p. 314-322 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The presented work describes a method of utilizing collagen hydroysate obtained through enzymatic hydrolysis of chrome-tanned shavings for preparing biodegradable films. Films were prepared by casting from a solution of collagen hydrolysate with added plasticizer (glycerol) and cross-linking agent (starch dialdehyde). Films thus prepared were subjected of thermal annealing at 60, 70, 80 and 90°C for 24 hours. Thermal annealing is a mode of physical cross-linking of film solubility. Solubility curves are important for applying biodegradable films in industrial practice. Thermal annealing was found to affect the crosslinking degree of prepared film in significant manner, hence, also, its solubility. Results indicate that collagen hydrolysate, following certain modification by plasticizer and crosslinking agent is capable of producing films whose properties may by additionally modified. En ligne : https://drive.google.com/file/d/129sLRa7Cj3L9k3Zt_F7YOe6xe303Mh7H/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2514 [article]

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