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JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) . Vol. CII, N° 4Mention de date : 04/2007Paru le : 10/05/2007 |
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Ajouter le résultat dans votre panierEvaluation of polymers prepared from gelatin and casein or whey as potential fillers / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 4 (04/2007)
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Titre : Evaluation of polymers prepared from gelatin and casein or whey as potential fillers Type de document : texte imprimé Auteurs : Maryann M. Taylor, Auteur ; William N. Marmer, Auteur ; Eleanor M. Brown Année de publication : 2007 Article en page(s) : p. 111-120 Note générale : p. 111-120 Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : We recently demonstrated that fillers could be formed inside leather when gelatins alone or mixed proteins, such as gelatin and casein or gelatin and whey, were added to wet blue that had been pretreated with microbial transglutaminase. To monitor these reactions, we had added fluorescently labeled proteins to stock solutions and examined the resultant filled leather using a microscope equipped with an epi-fluorescent attachment. In this present study, based on our understanding of the effect that enzyme modification will have on physical properties of crosslinked proteins, we polymerized potential filler products prior to their addition to the wet blue. We characterized the products with respect to their physical properties and molecular weight distribution (degree of polymerization). These products were applied to wet blue and evaluated, again using fluorescent labels to monitor their filling capability. It was shown that the proteins were evenly distributed throughout the hide and, more importantly, were not removed during the washing steps. Micrographs showing the location of fillers using fluorescent labels are presented. En ligne : https://drive.google.com/file/d/1EyCcZaQ4QEaQ1PsF4u2HMjq_tmtspR-0/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3359
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 4 (04/2007) . - p. 111-120[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007154 - Périodique Bibliothèque principale Documentaires Disponible Optimization of two low-salt chrome tanning processes without float / Josep Maria Morera in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 4 (04/2007)
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Titre : Optimization of two low-salt chrome tanning processes without float Type de document : texte imprimé Auteurs : Josep Maria Morera, Auteur ; Anna Bacardit, Auteur ; Lluis Ollé, Auteur ; J. Costa, Auteur ; Stefan Banaszak, Auteur Année de publication : 2007 Article en page(s) : p. 121-128 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The aim of this study was to develop at pilot plant level two systems of pickle-tanning that would reduce both the amount of waste water and its content in chrome and chlorides while obtaining leathers that are commercially acceptable. In the first one, the effect of the variation of the final tanning temperature as well as the system of adding the basificant in the formulation of a chrome tanning without float were studied. A 87 percent reduction of the residual float was obtained with this system. The amount of chrome in wastewater was reduced by 96 percent in this study as compared to that of a traditional tanning process. The reduction of chlorides in all the tanning tests without float was maintained at around 94 percent. In the second one, the pickle process was carried out without float and with low salt addition, and the inorganic acids were replaced by a sulphoaromatic acid. The effect of the variation of the final temperature was studied in the tanning, as well as the type of basification used for the chrome exhaustion in the residual float. A 88 percent reduction of the residual float was obtained with this system, as well as a 99 percent reduction in chrome content in wastewater and a 93 percent reduction in chlorides content in wastewater. En ligne : https://drive.google.com/file/d/1EhfY3d3_fEaRkIO7NlfuqgqSK0g8ctKG/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3360
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 4 (04/2007) . - p. 121-128[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007154 - Périodique Bibliothèque principale Documentaires Disponible Utilization of collagen hydrolysate in keratinase production from bacillus subtilis ATCC 6633 / Ahmet Aslan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 4 (04/2007)
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Titre : Utilization of collagen hydrolysate in keratinase production from bacillus subtilis ATCC 6633 Type de document : texte imprimé Auteurs : Ahmet Aslan, Auteur ; Huseyin Ata Karavana, Auteur ; G. Gulumser, Auteur ; I. Yasa, Auteur ; B. H. Cadirci, Auteur Année de publication : 2007 Article en page(s) : p. 129-134 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this study, chrome shavings from tanning industry were hydrolyzed with a commercial protease in alkali medium. Some chemical analyses were made and amino acid composition of collagen hydrolysate obtained from chrome shavings determined. This collagen hydrolysate was used for the production of keratinase from Bacillus subtilis ATCC 6633 as a carbon and nitrogen source. The culture grew in fermentation medium containing various proportion of collagen hydrolysate (1-5% w/v) at pH 7.0 and pH 10.0 with agitation rate of 200 rpm. The best keratinase production was obtained from the medium containing 1% hydrolysate (w/v) at pH 7.0 for 36 hours and with 3% hydrolysate (w/v) at pH 10.0 for 24 hours. En ligne : https://drive.google.com/file/d/1fF1_2B0896goPd5Blqsss2iwmxQUJdnn/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3361
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Code-barres Cote Support Localisation Section Disponibilité 007154 - Périodique Bibliothèque principale Documentaires Disponible Effect of different retanning systems on surface properties of leather / Swarna Vinodh Kanth in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 4 (04/2007)
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Titre : Effect of different retanning systems on surface properties of leather Type de document : texte imprimé Auteurs : Swarna Vinodh Kanth, Auteur ; A. Ipe, Auteur ; Balaraman Madhan, Auteur ; R. Venba, Auteur ; Aruna Dhathathreyan, Auteur Année de publication : 2007 Article en page(s) : p. 135-142 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The present work attempts to analyze the surface properties of crust leathers processed using different syntans of the type phenol-naphthalene formaldehyde condensate, phenol formaldehyde, melamine formaldehyde, gluteraldehyde, styrene maleic anhydride, acrylic polymer, sulphone and heterocyclic N-methylol. Contact angles of liquid drops on the leather surfaces have been used to evaluate surface energy, acidity, basicity, polarity, work of adhesion and surface roughness. The surface energy component showed that the control crust leather without retanning is practically monopolar basic with S- = 13.02 mN/m. Acrylic polymer retanned crust leather exhibited high basic character (carreS- = 33.15 mN/m), while phenol formaldehyde retanned crust leather had the least values (S- = 1.03 mN/m). The surface behavior towards rub fastness and adhesion of finish has been significantly altered by the retanning systems in leathers and showed a good correlation with the surface properties like surface charge, polarity, roughness and work of adhesion. En ligne : https://drive.google.com/file/d/1G00lD6GLJORh9mU-qS1cQEpc3mcY2SYZ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3362
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Code-barres Cote Support Localisation Section Disponibilité 007154 - Périodique Bibliothèque principale Documentaires Disponible
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Code-barres | Cote | Support | Localisation | Section | Disponibilité |
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007154 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |