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Mention de date : 10/1997
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The application of computational chemistry to the study of the chemistry of collagen / D. Buttar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCII, N° 8 (10/1997)
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Titre : The application of computational chemistry to the study of the chemistry of collagen Type de document : texte imprimé Auteurs : D. Buttar, Auteur ; R. M. Swart, Auteur ; R. Docherty, Auteur Année de publication : 1997 Article en page(s) : p. 185-189 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In this paper we describe a detailed molecular modeling study of the chemistry and structural features of collagen. This work includes studies from the basic tripeptide building units through the formation of triple helices to models of the microfibril structure of collagen. Where possible the calculations have been compared with available data. Calculations in the present paper are compared with previously reported models and trhe importance of force-field choice and C-H:::O-C non-bonded interactions are discussed. With the inclusion of the actual amino acid sequence the result is the construction of a realistic microfibril model of calf-skin type I collagen. The models described will be used to understand conventional tanning processes and to design and develop novel tanning agents. En ligne : https://drive.google.com/file/d/1Q8rMt34k_M8y4DlDdICeqg-uHqkvnLT9/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7591
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCII, N° 8 (10/1997) . - p. 185-189[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006959 - Périodique Bibliothèque principale Documentaires Disponible Influence 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)
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Titre : Influence of pepsin and trypsin on chemical and physical properties of isolated gelatin from chrome shavings Type de document : texte imprimé Auteurs : Luisa F. Cabeza, Auteur ; Maryann M. Taylor, Auteur ; Eleanor M. Brown, Auteur ; William N. Marmer, Auteur Année de publication : 1997 Article en page(s) : p. 200-207 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : During the last century, proteolytic enzymes have been used to solubilize collagen. Each enzyme attacks the molecule in a different way; the specificity of each enzyme is already known. After enzymatic digestion, either gelatin or peptides can be obtained from pure collagen. Enzymes have been also applied to gelatin isolation from chrome shavings. In previous work, the effects of different enzymes such as alkaline protease, pepsin, papain, trypsin and chymotrypsin were surveyed, with the discovery that the choice of enzyme had much more influence than the conditions of the experiment. In the current study, pepsin and trypsin, the most promising enzymes from the previous study,were used to study their effects in depth. Chrome shavings were preteated for 6 to 24 hours with an enzymic solution, at the optimum pH for the enzyme, and at room temperature; only selected bonds were broken. Gelatin was extracted at 70°C; pH 8 was used at this stage to avoid chrome solubilization. Chemical and physical properties - moisture, ash, nitrogen, and chrome content, gelstrength, viscosity, and molecular weight distribution - were determined for the isolated gelatin. The results were used to compare the effectiveness of both enzymes. Whereas pepsin behaved as a mild enzyme with a controllable effect on leather wastes, trypsin gave a better yield. The isolation of high quality products from wastes will allow a more cost-effective recycling procedure, an incentive to the tanning industry not to dispose of this waste material in landfills. En ligne : https://drive.google.com/file/d/16RVk5Ph8kbSDigEXbTqyLqUrmTE8Ih12/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7592
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCII, N° 8 (10/1997) . - p. 200-207[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006959 - Périodique Bibliothèque principale Documentaires Disponible
Exemplaires (1)
Code-barres | Cote | Support | Localisation | Section | Disponibilité |
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006959 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |