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Enzymatic modification of hydrolysis products from collagen using a microbial transglutaminase. I. Physical properties / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 9 (09/2001)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVI, N° 9 (09/2001) . - p. 319-332 Titre : Enzymatic modification of hydrolysis products from collagen using a microbial transglutaminase. I. Physical properties Type de document : texte imprimé Auteurs : Maryann M. Taylor, Auteur ; Luisa F. Cabeza, Auteur ; William N. Marmer, Auteur ; Eleanor M. Brown, Auteur Année de publication : 2001 Article en page(s) : p. 319-332 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In previously reported research from this laboratory, gelatins, both commercial and experimental of varying gel strengths, were chemically modified using glutaraldehyde, glyoxal, and carbodiimide. These classical modifications effectively changed the physical and functional properties of gelatin; however, they have drawbacks in that the crosslinking agents are potentially toxic. Transglutaminase is an enzyme capable of forming inter- or intra-molecular cross-links in many proteins. The enzyme catalyzes an acyl transfer reaction between the g-carboxamide group of peptide-bound glutamine residues as acyl donors and primary amines as acceptors. When the e-amino group of peptide-bound lysine acts as acyl acceptor, an e-(g-glutamyl) lysine cross-link is formed. This enzyme, now isolated by fermentation, is commercially available, relatively inexpensive, and environmentally safe. We modified gelatins of varying quality with microbial transglutaminase. Gel strengths of low bloom gelatins improved with increasing enzyme concentrations, whereas the gel strengths of higher bloom gelatins either remained the same or decreased with increasing enzyme concentrations. All gelatins gave higher melting points with increasing amounts of enzyme, some even higher than 90ºC. Viscosities, measured at 60ºC and at or near room temperature, increased with increasing enzyme concentrations. The temperature of gelation, as described in the literature, increased not only with the quality of the gelatin but also with increasing enzyme concentrations. Potential applications for this enzyme in by-product utilization and possibly the leather-making process are numerous. En ligne : https://drive.google.com/file/d/1wvenobFOzHHSyBVxHpPVwLjdWfOQ9qxk/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4363 [article]

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Evaluation of urea sulfate as a substitute for formic acid in the retan, color, and fatliquor process / Andrew G. Gehring in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 9 (09/2001)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVI, N° 9 (09/2001) . - p. 333-342 Titre : Evaluation of urea sulfate as a substitute for formic acid in the retan, color, and fatliquor process Type de document : texte imprimé Auteurs : Andrew G. Gehring, Auteur ; David G. Bailey, Auteur ; Jeanette M. Cardamone, Auteur ; Gary L. DiMaio, Auteur Année de publication : 2001 Article en page(s) : p. 333-342 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Formic acid is a noxious and corrosive chemical that must be handled with extreme care by workers in the leather tanning industry. A safe alternative to formic acid in the retan, color, and fatliquor process would be highly desired if the alternative was not only demonstrated to be an equally efficient but also a cost effective replacement. Commercially prepared wet blue (bovine origin) was subjected to the retan, color, and fatliquor process utilizing either urea sulfate or formic acid during dyeing. The resultant hide pieces were further processed into crust leather. Multiple physical and chemical measurements were performed on the crust to evaluate the effects of formic acid substitution with urea sulfate. Although there were slight differences in perspiration testing and light fastness results, no remarkable difference in dye uptake and color uniformity was observed by substituting formic acid with urea sulfate. However, crust leather was remarkably lighter in coloration when dyed with select dyes in the presence of urea sulfate. Interestingly, hide pieces tended to leach relatively less chromium into dye baths containing urea sulfate. En ligne : https://drive.google.com/file/d/1HfUaGlQw2SN2Df11ekc5MyhbVEdORHhR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4364 [article]

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Tanning agent based on mixed metal complexes of aluminium and zinc / Balaraman Madhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 9 (09/2001)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVI, N° 9 (09/2001) . - p. 343-349 Titre : Tanning agent based on mixed metal complexes of aluminium and zinc Type de document : texte imprimé Auteurs : Balaraman Madhan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2001 Article en page(s) : p. 343-349 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Environmental awareness throughout the world has forced researchers to look for an alternative-tanning agent for chromium. The alternative-tanning agent should produce white leathers with properties comparable to that of chrome tanned leather. A tanning agent based on mixed complexes of Aluminium(III) and Zinc(II) was prepared using different combination of ligands such as sodium citrate, triethylenetetramine, phthalic acid and sodium tartrate. The salt thus prepared was used for tanning studies. This chrome free tanning agent produces white leather with a shrinkage temperature above 90°C. The strength characteristics as well as the organoleptic properties of these leathers were comparable to that of conventional chromium and aluminium tanned leathers. En ligne : https://drive.google.com/file/d/1A_D0_ZwSHx29wVPigAc9f5_I61Rd7PXV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4365 [article]

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The impact of disease developments on trade in livestock products / Leonard W. Condon in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 9 (09/2001)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVI, N° 9 (09/2001) . - p. 350-356 Titre : The impact of disease developments on trade in livestock products Type de document : texte imprimé Auteurs : Leonard W. Condon, Auteur Année de publication : 2001 Article en page(s) : p. 350-356 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure En ligne : https://drive.google.com/file/d/1lHvMK_QmeajHs1ZVONqHVEqN13xKinKy/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4366 [article]

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