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675 : Technologie du cuir et de la fourrure |
Ouvrages de la bibliothèque en indexation 675
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Molecular level understanding of the stability difference in collagen induced by chromium sulfate and aluminum sulfate / Weimo Han in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 6 (11-12/2017)
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Titre : Molecular level understanding of the stability difference in collagen induced by chromium sulfate and aluminum sulfate Type de document : texte imprimé Auteurs : Weimo Han, Auteur ; Jianfei Zhou, Auteur ; Wenhua Zhang, Auteur ; Bi Shi, Auteur Année de publication : 2017 Article en page(s) : p. 273-279 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène -- Stabilité
Sulfate d'aluminium
Sulfate de chrome
Tannage minéralTannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminiumIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Though the tanning process of both chromium(III) and aluminum(III) are mainly the reactions of coordination with the collagen side chain carboxyl groups, the stability toward water and denaturing temperature of Cr(III)-tanned leather is much higher than that of Al(III)-tanned leather. In this paper, the differences between Cr(III) and AI(III) tanning mechanisms are explored from the species distribution of tanning liquors and the thermodynamics of coordination reaction. First, there are more multinuclear metal species in Cr(III) tanning liquor than in Al(III) tanning liquor through visual Minteq. For example, at pH4 Cr3(OH)4(H2O)10 5+ accounted for 39% in 0.05mol/L Cr2(SO4)3, and Al (OH)4(H2O), only 0.04% in 0.05mol/L AI2(SO4)3. In addition, a large amount of negative species Al(SO4)2(H2O)2 (always about 30% in AI2(SO4)3) appeared in Al(III) tanning liquor, which would show low coordinating effect because of the electrostatic repulsion with the ionised collagen sidechain carboxyl groups. The density functional method (DFT) was used to study the kinetics (the electrophilic indexes w) and thermodynamics (the Gibbs energy change ?rG) of tanning reaction with Lanl2dz for metal atoms and 6-31g(d) for non-metal atoms. The results showed that the reactivity of multinuclear species is higher and the complexes formed by collagen and multinucIear species are more stable for both Cr(III) and Al(III), and the differences of ?rG between corresponding Cr(Ill) and Al(lll) tanning reactions are miner. Then the main reason for the lower shrinkage temperature of Al2(SO4)3 may be the lower contents of multinuclear aluminum species and the higher content of the negative specie Al(SO4)2(H2O)2 in AI(III) tanning liquor. These results suggested that appropriate masking agents which could increase the multinuclear aluminum species content and decrease the negative species content should improve the AI(III) tanning process Note de contenu : - METHODS : The main chromium and aluminum species present under the pH range of tanning - The models of collagen sidechain carboxyl groups - The theoretical parameters
- RESULTS AND DISCUSSION : The main species in Cr(III) and Al(III) tanning liquor - The reactivity of chromium and aluminium species - The driving force of typical reaction of Cr(III) and Al(III) tanningEn ligne : https://drive.google.com/file/d/1T7KdyR561R35KhADfXa1mw77cSrGZhXU/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29658
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Code-barres Cote Support Localisation Section Disponibilité 19446 - Périodique Bibliothèque principale Documentaires Disponible Molecular 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)
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Titre : Molecular modeling of N-terminal telopeptides of bovine type I collagen Type de document : texte imprimé Auteurs : Phoebe X. Qi, Auteur ; Eleanor M. Brown, Auteur Année de publication : 2002 Article en page(s) : p. 235-243 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Functionality, both biological and technological, follows from protein structure. Computer-assisted molecular modeling is a useful tool for visualizing structure-function relationships in proteins. A model of the triple helical portion of a bovine type I collagen microfbril was previously developed in our laboratory for use in studies of mechanisms of collagen crosslinking and modification. This model has now been enhanced by the addition of the N-terminal, nonhelical, telopeptides. The telopeptide region is highly flexible, allowing reactive side-chains of residues such as lysine to assume conformations favorable for interaction with adjacent triple helix chains. All naturally occurring collagen crosslinks are anchored in the telopeptide region. This enhancement to our model will enable us to visualize the effects of enzymatic crosslinking on collagen structure and stability. The current model is now more useful for studying mechanisms of inter- and intramicrofibril crosslinking of collagen by chemical and biochemical methods. The potential for transglutaminase crosslinking of collagen is explored with the model. En ligne : https://drive.google.com/file/d/1fyvNuAYfLxmLsoCIHZYmi-Oin2CYU_Oo/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4292
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Code-barres Cote Support Localisation Section Disponibilité 001575 - Périodique Bibliothèque principale Documentaires Disponible Molecular modelling of tanning processes / Jens Fennen in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 82, N° 1 (01-02/1998)
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Titre : Molecular modelling of tanning processes Type de document : texte imprimé Auteurs : Jens Fennen, Auteur Année de publication : 1998 Article en page(s) : p. 5-10 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : During the past decade molecular modelling techniques have been a field of major research. The underlying theory has been refined, modelling programs have become both faster and more reliable, additionally computer power has increased enormously. The main focus and driving force of the application of these tools has so far been in the area of drug design. Although results have not always been up to expectations, molecular modelling can now be considered to be one of the standard tools in pharmaceutical research.
With this palette of modelling tools at hand, it seems promising to investigate the chemical nature of tanning processes at a molecular level. Starting from results obtained at the Eastern Regional Research Center, USDA, Philadelphia, the paper presents the development of a model for bovine collagen type I in aqueous medium and its refinement with the m olecular dynamics method.
Density functional theory (DFT) methods were used to calculate the structure of a model chrome complex as it is believed to be formed during the process of chrome tanning. The positions of reactive sites in the collagen model are finally compared with the dimensions of the chrome complex model and show a good fit.
It will then be discussed what else might be achieved by molecular modelling in the field of leather chemistry after a promising stard and which problems still have to be solved. The question of the size of an appropriate model which should reproduce macroscopic effects will especially be adressed.Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7935
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Code-barres Cote Support Localisation Section Disponibilité 007020 - Périodique Bibliothèque principale Documentaires Disponible Molecular sieve chromatography / David S. Robinson in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60 (Année 1976)
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Titre : Molecular sieve chromatography Type de document : texte imprimé Auteurs : David S. Robinson, Auteur Année de publication : 1976 Article en page(s) : p. 33-36 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie analytique
Chromatographie sur gel
Polymères réticulés
Tamis moléculairesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Since 1959, when cross-linked dextran gels were first prepared by Flodin and Porath, a whole new field of chromatography has become available based on differences in molecular size. The various methods and materials used for gel filtration are described and particular use is made of theoretical considerations to determine the factros which influence resolution during gel filtration. Affinity chromatography on porous media and the use of chemically modified sepharoses are briefly considered. Note de contenu : - Theoretical Considerations
- Further Applications
- Fig. 1 : A diagrammatic illustration of the separation of small and large molecules by gel filtration
- Fig. 2 : A definition of elution parametres for gel filtration
- Table 1 : The Fractionation Range of the Dextran Type Cross-linked PolymersEn ligne : https://drive.google.com/file/d/1rSgqh7_yr7rO6fFt2KFb1G-lpzZnoSPP/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31800
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 60 (Année 1976) . - p. 33-36[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008596 - Périodique Archives Documentaires Exclu du prêt Molecular sieve chromatography / David S. Robinson in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60, N° 2 (03-04/1976)
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[article]
Titre : Molecular sieve chromatography Type de document : texte imprimé Auteurs : David S. Robinson, Auteur Année de publication : 1976 Article en page(s) : p. 33-36 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie analytique
Chromatographie sur gel
Polymères réticulés
Tamis moléculairesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Since 1959, when cross-linked dextran gels were first prepared by Flodin and Porath, a whole new field of chromatography has become available based on differences in molecular size. The various methods and materials used for gel filtration are described and particular use is made of theoretical considerations to determine the factros which influence resolution during gel filtration. Affinity chromatography on porous media and the use of chemically modified sepharoses are briefly considered. Note de contenu : - Theoretical Considerations
- Further Applications
- Fig. 1 : A diagrammatic illustration of the separation of small and large molecules by gel filtration
- Fig. 2 : A definition of elution parametres for gel filtration
- Table 1 : The Fractionation Range of the Dextran Type Cross-linked Polymers
En ligne : https://drive.google.com/file/d/1rSgqh7_yr7rO6fFt2KFb1G-lpzZnoSPP/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31865
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 60, N° 2 (03-04/1976) . - p. 33-36[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007105 - Périodique Bibliothèque principale Documentaires Disponible Molecular 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)
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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)
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PermalinkMollescal an alternative to eliminating or reducing sulfide in beamhouse effluent / Frank N. Petraglia in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXVI (Année 1981)
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PermalinkMonitoring of available decorin in different parts of bovine hide during its processing into leather / Mila L. Adelma-Ramos in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 12 (12/2007)
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PermalinkMonitoring the mode of action of synthetic and natural biocides against Aeromonas hydrophila by Raman spectroscopy and chemometrics / Megha Mehta in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)
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PermalinkMore security in leather dyeing by observing build-up power an affinity numbers / L. Rooryck in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61, N° 4 (07-08/1977)
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PermalinkMore security in leather dyeing by observing build-up power and affinity numbers / L. Rooryck in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61 et 62 (Années 1977 et 1978)
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PermalinkMould growth on pickled pelt / J. C. Glover in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 59 (Année 1975)
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PermalinkMould growth on pickled pelt / J. C. Glover in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 59, N° 3 (05-06/1975)
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PermalinkPermalinkMulticriteria analysis of leather performance / J. Rudecka in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 4 (07-08/2009)
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PermalinkMultidimensional analysis of magnesium oxide hydrolysis of wet-blue shavings / Kalyani Martinelango in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 6 (06/2004)
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PermalinkPermalinkMycotic dermatitis and cockle / Betty M. Haines in JOURNAL OF THE SOCIETY OF LEATHER TRADES' CHEMISTS, Vol. 54, N° 3 (03/1970)
PermalinkMycotic dermatitis and cockle / Betty M. Haines in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 54, N° 3 (03/1970)
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