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Auteur Eleanor M. Brown
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United States Department of Agriculture, Agricultural Research Service Eastern Regional Research Center - Mermaid Lane, Wyndmoor, PA - USA
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Essential chromium ? / Eleanor M. Brown in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 10 (10/2003)
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Titre : Essential chromium ? Type de document : texte imprimé Auteurs : Eleanor M. Brown, Auteur ; Maryann M. Taylor, Auteur Année de publication : 2003 Article en page(s) : p. 408-414 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : During the production of chrome-tanned leather, chromium is incorporated into the leather with at least three types of interactions. Most important is the chromium that is complexed with collagen to give leather its characteristic properties. Other interactions include nonproductive binding of chromium to collagen and adsorption of chromium by the collagen matrix. To evaluate the extent and possible effects of these other interactions, we extracted chrome shavings with water, HCl, or EDTA to remove adsorbed or loosely bound chromium. The effect of chromium removal on hydrothermal stability was followed by differential scanning calorimetry, and the chromium content of extracts was determined by atomic absorption spectrometry. Extraction of less than 2% of the chromium initially present had no effect on the denaturation temperature, but removal of 3% to 10% of the chromium resulted in a 20°C decrease in the denaturation temperature. As 10% to 60% of the chromium was extracted, the denaturation temperature decreased an additional 30°C, nearly reaching the temperature expected for leather that was not tanned. The results suggest that up to 2% of the chromium is simply adsorbed, and most easily removed. The next 3% to 10% is, however, important for the thermal stability of the shavings. Beyond this level, extraction with EDTA continually shifts the chromium-collagen equilibrium and the denaturation temperature to lower values. The final approximately 40% of the chromium appears to be bound to the collagen, but no longer crosslinked. En ligne : https://drive.google.com/file/d/15VqcpVGPaHzcHsDsf3vEmebpqPLjnN6r/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4163
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVIII, N° 10 (10/2003) . - p. 408-414[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001592 - Périodique Bibliothèque principale Documentaires Disponible Evaluation 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
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Code-barres Cote Support Localisation Section Disponibilité 007154 - Périodique Bibliothèque principale Documentaires Disponible 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)
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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 : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2511
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Code-barres Cote Support Localisation Section Disponibilité 010636 - Périodique Bibliothèque principale Documentaires Disponible Extraction of value added byproducts from the treatment of chromium containing collagenous leather industry waste / Maryann M. Taylor in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 81, N° 1 (01-02/1997)
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Titre : Extraction of value added byproducts from the treatment of chromium containing collagenous leather industry waste Type de document : texte imprimé Auteurs : Maryann M. Taylor, Auteur ; Luisa F. Cabeza, Auteur ; William N. Marmer, Auteur ; Eleanor M. Brown, Auteur ; C. J. Thompson, Auteur ; Edward J. Diefendorf, Auteur Année de publication : 1997 Article en page(s) : p. 5-13 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Tannage chrome Extraction sous-produits collagène Déchets solides Industrie cuir Traitement alcali enzymes Produits hydrolisés Recyclage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the United States, over 60 000 metric tons of chromium containing solid waste is generated by the leather industry each year, and approximately ten times this amount is generated world-wide. Environmental concerns and escalating landfill costs are becoming increasingly serious problems to the leather industry and alternative disposal methods are needed. We have developed two processes in which this waste is treated with alkali and enzymes to extract hydrolyzed and gelable protein products and a recyclable chromium cake. We have demonstrated that these processes are repeatable with respect to their chemical and physical properties and that good and repeatable material balances are obtained. The isolated chromium can be chemically treated and recycled into the tanning process. The recovered protein fractions, practically devoid of chromium, could be used in a wide range of products, including adhesives, cosmetics, films, animal feed and fertilizer. En ligne : https://drive.google.com/file/d/186TYoO7d7ao1ilMwxu-b8rmf_AsfGLuk/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8075
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 81, N° 1 (01-02/1997) . - p. 5-13[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007014 - Périodique Bibliothèque principale Documentaires Disponible Fabrication of composite films based on chitosan and vegetable-tanned collagen fibers crosslinked with genipin / Jie Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 10 (10/2021)
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Titre : Fabrication of composite films based on chitosan and vegetable-tanned collagen fibers crosslinked with genipin Type de document : texte imprimé Auteurs : Jie Liu, Auteur ; Yanchun Liu, Auteur ; Eleanor M. Brown, Auteur ; Zhengxin Ma, Auteur ; Cheng-Kung Liu, Auteur Année de publication : 2021 Article en page(s) : p. 345-358 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
ChitosaneLe chitosane ou chitosan est un polyoside composé de la distribution aléatoire de D-glucosamine liée en ß-(1-4) (unité désacétylée) et de N-acétyl-D-glucosamine (unité acétylée). Il est produit par désacétylation chimique (en milieu alcalin) ou enzymatique de la chitine, le composant de l'exosquelette des arthropodes (crustacés) ou de l'endosquelette des céphalopodes (calmars...) ou encore de la paroi des champignons. Cette matière première est déminéralisée par traitement à l'acide chlorhydrique, puis déprotéinée en présence de soude ou de potasse et enfin décolorée grâce à un agent oxydant. Le degré d'acétylation (DA) est le pourcentage d'unités acétylées par rapport au nombre d'unités totales, il peut être déterminé par spectroscopie infrarouge à transformée de Fourier (IR-TF) ou par un titrage par une base forte. La frontière entre chitosane et chitine correspond à un DA de 50 % : en deçà le composé est nommé chitosane, au-delà , chitine. Le chitosane est soluble en milieu acide contrairement à la chitine qui est insoluble. Il est important de faire la distinction entre le degré d'acétylation (DA) et le degré de déacétylation (DD). L'un étant l'inverse de l'autre c'est-à -dire que du chitosane ayant un DD de 85 %, possède 15 % de groupements acétyles et 85 % de groupements amines sur ses chaînes.
Le chitosane est biodégradable et biocompatible (notamment hémocompatible). Il est également bactériostatique et fongistatique.
Le chitosane est également utilisé pour le traitement des eaux usées par filtration ainsi que dans divers domaines comme la cosmétique, la diététique et la médecine.
Collagène
Cuirs et peaux -- Déchets -- Recyclage
Films composites
Génipine
Réticulants
Tannage végétalIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The leather industry generates considerable amounts of solid waste and raises many environmental concerns during its disposal. The presence of collagen in these wastes provides a potential protein source for the fabrication of bio-based value-added products. Herein, a novel composite film was fabricated by incorporating vegetable-tanned collagen fiber (VCF), a mechanically ground powder-like leather waste, into a chitosan matrix and crosslinked with genipin. The obtained composite film showed a compact structure and the hydrogen bonding interactions were confirmed by FTIR analysis, indicating a good compatibility between chitosan and VCF. The optical properties, water absorption capacity, thermal stability, water vapor permeability and mechanical properties of the composite films were characterized. The incorporation of VCF into chitosan led to significant decreases in opacity and solubility of the films. At the same time, the mechanical properties, water vapor permeability and thermal stability of the films were improved. The composite film exhibited antibacterial activity against food-borne pathogens. Results from this research indicated the potential of the genipin-crosslinked chitosan/VCF composites for applications in antimicrobial packaging. Note de contenu : - EXPERIMENTAL : Materials - Characterization of VCF - Preparation of films - Characterization of the films
- RESULTS AND DISCUSSION : Characterization of VCF - Structural characterization of the films - Optical properties - Moisture content and water solubility - Water vapor permeability - Thermal stability - Mechanical properties - Dynamic mechanical analysis - Preliminary evaluation of antibacterial activity
- Table 1 : Color parameters of the genipin-crosslinked chitosan-based films
- Table 2 : TGA parameters of the genipin-crosslinked chitosan-based films
- Table 3 : Mechanical properties of the genipin-crosslinked chitosan-based filmsDOI : https://doi.org/10.34314/jalca.v116i10.4616 En ligne : https://drive.google.com/file/d/1tGxiqUXia9haWYRccU7nGb-X2WKaXjVV/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36406
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Code-barres Cote Support Localisation Section Disponibilité 23019 - Périodique Bibliothèque principale Documentaires Disponible Functional properties of hydrolysis products from collagen / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIII, N° 2 (02-03/1998)
PermalinkGenipin -aluminium or -vegetable tannin combinations on hide powder / Keyi Ding in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 5 (05/2007)
PermalinkInfluence of pepsin and trypsin on chemical and physical properties of isolated gelatin from chrome shavings / Luisa F. Cabeza in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCII, N° 8 (10/1997)
PermalinkIsolation of protein products from chromium-containing leather waste using two consecutive enzyme and purification of final chromium product : pilot plant studies / Luisa F. Cabeza in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 83, N° 1 (01-02/1999)
PermalinkModel of the helical portion of a type I collagen microfibril / Eleanor M. Brown in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCII, N° 1 (01/1997)
PermalinkModified collagen hydrolysate, potential for use as a filler for leather / Wuyong Chen in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 7 (07/2001)
PermalinkMolecular modeling approach to vegetable tanning : Preliminary results for gallotannin interactions with the collagen microfibril / Eleanor M. Brown in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 5 (05/2011)
PermalinkMolecular modeling of N-terminal telopeptides of bovine type I collagen / Phoebe X. Qi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 6 (06/2002)
PermalinkMolecular size and conformation of protein recovered from chrome shavings / Eleanor M. Brown in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIX, N° 7 (07/1994)
PermalinkMolecular weight distribution and functional properties of enzymatically modified commercial and experimental gelatins / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 3 (03/2004)
PermalinkPotential application for genipin-modified gelatin in leather processing / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 3 (03/2009)
PermalinkPotential applications for gelatin isolated from chromium-contaning solid tannery waste : microencapsulation / Luisa F. Cabeza in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LCIV, N° 5 (07/1999)
PermalinkPotential interactions of the C-terminal telopeptides of bovine type I collagen / Eleanor M. Brown in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 9 (09/2004)
PermalinkPowdered hide model for vegetable tanning / Eleanor M. Brown in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 1 (01/2014)
PermalinkPowdered hide model for vegetable tanning II : hydrolyzable tannin / Eleanor M. Brown in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 1 (01/2015)
PermalinkPowered hide for research on tanning mechanisms / Eleanor M. Brown in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 4 (04/2010)
PermalinkPredicted interactions of ionizable side chains in a fragment of the three-dimensional energy-minimized model for calf skin type I collagen microfibril / Eleanor M. Brown in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVIII, N° 1 (01/1993)
PermalinkPreparation and characterization of biopolymers derived from enzymatically modified gelatin and whey / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 6 (06/2006)
PermalinkPreparation and characterization of gelatin/chitosan/carbodiimide Films / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 12 (12/2017)
PermalinkPreparation and characterization of polyphenol-modified gelatin products / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 2 (02/2012)
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