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Measurement of collagenase activity in the tannery and in the laboratory I. the assay medium / S. M. Mozersky in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXX, N° 12 (12/1995)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXX, N° 12 (12/1995) . - p. 357-364 Titre : Measurement of collagenase activity in the tannery and in the laboratory I. the assay medium Type de document : texte imprimé Auteurs : S. M. Mozersky, Auteur ; David G. Bailey, Auteur Année de publication : 1995 Article en page(s) : p. 357-364 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A commercially available acidic solution of pepsin-treated porcine skin collagen designed for cosmetic use was shown to be suitable as a substrate for viscometric assay of collagenase activity when adjusted to near neutrality and diluted with the proper buffer to a collagen concentration of 1.5 to 4.5 g/L. The buffer contains tris(hydroxymethylamino) methane (tris), citrate, and calcium (ca2+). The pH of the assay solution is 6.8. The assay solution can be supplemented with NaCl up to a concentration of at least 0.4M and the pH can be raised to at least 8.5. Pepsin treatement of calfskin colagen yields a product whose viscometric behavior in the presence of collagenase is virtually identical to that of the commercial porcine product. En ligne : https://drive.google.com/file/d/1-lgi2uHxGd-Ol-t2F10SSzc1LRIUjNCU/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7861 [article]

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Effect of deionization on the physical properties of gelable protein products recovered from solid tannery waste / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXX, N° 12 (12/1995)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXX, N° 12 (12/1995) . - p. 365-374 Titre : Effect of deionization on the physical properties of gelable protein products recovered from solid tannery waste Type de document : texte imprimé Auteurs : Maryann M. Taylor, Auteur ; Edward J. Diefendorf, Auteur ; William N. Marmer, Auteur ; Eleanor M. Brown, Auteur Année de publication : 1995 Article en page(s) : p. 365-374 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Extraction of gelatin or gelable protein products from solid tannery by-products has been demonstrated previously. During the commercial manufacture of gelatin from limed hides, skins and bones, it is common practice to pass the gelatin through a mixed-bed deionizing column in order to reduce the ash content of the proteinK. In the gelable protein products that we are isolating from chrome-tanned waste, the ash content is relatively high and is a function of both the alkali treatment and the original composition of the chrome waste. We have shown that deionizing the protein will reduce the ash. There is, however, a question as to what effect this treatment will have on the bloom and the viscosity - commonly reported analyses for gel quality. Moreover, we have previously shown that the choice of alkali will affect the physical properties were improved in the deionized samples and this is probably due to the increased protein concentration with a small effect contributed by the removal of the ash. Proteins yields were also calculated and we found that the type and concentration of alkali used to extract the gelable protein will affect the yield. We also demonstrated that these processes are reproducible and that good material balances can be obtained. En ligne : https://drive.google.com/file/d/1b1sA1Pj_vqZsOgvqLMTNDwU3fAm9Qqcr/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17838 [article]

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