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Mention de date : 07/1999
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Chemical modification of protein products isolated from chromium-containing solid tannery waste and resultant influence on physical and functional properties / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LCIV, N° 5 (07/1999)
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Titre : Chemical modification of protein products isolated from chromium-containing solid tannery waste and resultant influence on physical and functional properties Type de document : texte imprimé Auteurs : Maryann M. Taylor, Auteur ; William N. Marmer, Auteur ; Eleanor M. Brown, Auteur ; Luisa F. Cabeza, Auteur Année de publication : 1999 Article en page(s) : p. 171-181 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Samples of gelatin extracted from chromium-containing leather waste by different protocols were chemically modified with glutaraldehyde, glyoxal and carbodiimide and compared to similarly modified commercial gelatins. Glutaraldehyde appeared to be a very efficient cross-linker, giving gels that would not melt at 70 oC with the addition of only 2% glutaraldehyde but with a decrease in their rigidity when the amount of glutaraldehyde was increased. Foaming tests on these samples demonstrated that the addition of low amounts of glutaraldehyde increased both the foam capacity and the foam stability of the gelatins. Glyoxal modification did not have such an effect on the gel strength and melting point of the samples. It did not increase foam capacity but did increase foam stability, it gave better adhesive properties to these gelatins and it did increase dramatically their emulsification capacity. Carbodiimide had similar effects on gel strength as glyoxal; it did increase dramatically the melting point of commercial gelatin but had no effect on the melting point of the extracted gelatins. It decreased the foam and adhesive properties of all the samples, but it did increase the emulsification capacity of the extracted gelatins. The study demonstrates that the functional properties of chemically modified gelatin extracted from chromium-containing leather waste were changed, and, as a result, new uses could be identified for these value-added products. Note de contenu : - EXPERIMENTAL : Material - Chemical modification
- METHODS : Analyses - Gel strenght - Melting point - Foamability - Adhesive test - Emulsion capacity
En ligne : https://drive.google.com/file/d/1lbZ5PcQBffG9si0Z7QXouceREnsJPz67/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4452
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LCIV, N° 5 (07/1999) . - p. 171-181[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006975 - Périodique Bibliothèque principale Documentaires Disponible Potential 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)
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Titre : Potential applications for gelatin isolated from chromium-contaning solid tannery waste : microencapsulation 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 : 1999 Article en page(s) : p. 182-189 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Gelatin has been extensively used in simple and complex coacervation technologies to microencapsulate drugs, essential oils, perfumes, and other materials. The aim of this work was to use gelatin isolated from chromium-containing solid tannery waste to demonstrate the potential application of this product in microencapsulation. As a model, an anionic semi-synthetic fatliquor, typically used in the tanning industry, was microencapsulated by complex coacervation using gelatin and acacia. The behaviors of commercial gelatins (75 and 225 g Bloom) and alkali- or enzyme-extracted gelatins from chrome shavings were compared. The microencapsulation process was repeatable and no significant differences were found between commercial and extracted gelatins. Sieving analysis showed similar size particles in the different samples, and microscopic analysis showed that the particles had a tendency to aggregate. The marketability of a product with such a potential application should encourage the industry to recycle tannery wastes instead of dumping them into landfills. Note de contenu : - EXPERIMENTAL : Materials - Microencapsulation process - Assays En ligne : https://drive.google.com/file/d/1NuDi-3snq4yVZRexfsvjA_f-Txv29LDi/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4453
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LCIV, N° 5 (07/1999) . - p. 182-189[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006975 - Périodique Bibliothèque principale Documentaires Disponible The effect of surfactant on the isolation of protein products from chromium-containing solid tannery waste. Influence on the process and on the chemical, physical and functional properties of the resultant gelatin / Luisa F. Cabeza in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LCIV, N° 5 (07/1999)
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Titre : The effect of surfactant on the isolation of protein products from chromium-containing solid tannery waste. Influence on the process and on the chemical, physical and functional properties of the resultant gelatin Type de document : texte imprimé Auteurs : Luisa F. Cabeza, Auteur ; Sandra M. Clauson, Auteur ; Maryann M. Taylor, Auteur ; Eleanor M. Brown, Auteur Année de publication : 1999 Article en page(s) : p. 190-198 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Protein products can be isolated from chrome shavings using two processes that had been demonstrated to be economically attractive. Surfactant is used during the extraction of the protein products to avoid foam formation. Foam would make the manipulation of the mixtures difficult, disturbing the separation of the protein products from the residual chrome cakes, and could inactivate the enzyme. The influence of surfactant on the gelatin isolated from chrome shavings was studied. First, the need for surfactant during the extraction process in the one-step and the two-step processes was studied in the laboratory. Then, the two-step process was carried out with and without surfactant in pilot plant scale experiments to evaluate the foam formation during the first step. The physical and chemical analyses of the gelatin extracted showed good repeatability of the process, with no significant differences between the gelatins isolated with and without the use of surfactant. Finally, functional properties of the gelatin extracted in the pilot plant experiments were determined and compared, to evaluate the influence of surfactant on each of them. These experiments showed that surfactant is not always necessary, and it will depend on the equipment used when the process is carried out industrially. The use of surfactant should be avoided when possible, and when used its influence on foaming and emulsification properties should be expected. Note de contenu : - EXPERIMENTAL : Materials - Procedures - Analyses - Foamability - Adhesive test - Emulsion capacity En ligne : https://drive.google.com/file/d/1CHgbct6RKT-Xl2LDC9LvSQ8IS3UiW9cp/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4454
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LCIV, N° 5 (07/1999) . - p. 190-198[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006975 - Périodique Bibliothèque principale Documentaires Disponible
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Code-barres | Cote | Support | Localisation | Section | Disponibilité |
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006975 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |