Effect of processing variable on ash content of gelable and hydrolyzed protein products isolated from treatment of chronium leather waste / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVIII, N° 1 (10/1993)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXVIII, N° 1 (10/1993) . - p. 358-367 Titre : Effect of processing variable on ash content of gelable and hydrolyzed protein products isolated from treatment of chronium leather waste Type de document : texte imprimé Auteurs : Maryann M. Taylor, Auteur ; Edward J. Diefendorf, Auteur ; C. J. Thompson, Auteur ; Eleanor M. Brown, Auteur ; William N. Marmer, Auteur Année de publication : 1993 Article en page(s) : p. 358-367 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Enzymic processing of chronium-containing leather waste is an alternative to dumping in landfills. In prior research, we demonstrated that chrome shavings as well as chrome slits and trimmings may be hydrolyzed enzymically. In our new two step process chrome shavings were treated under alkaline conditions to obtain a high-value, high molecular weight gelable protein fraction, then the sludge that remained was treated enzymically to isolate a hydrolyzed protein fraction with 10,000-20,000 molecular weight distribution, and a recyclable chromium cake. Because there is concern that the character and quantity of the ash in the protein products would have an adverse effect on marketing of these products, we investigated the use of different proportions of alkaline agents, i.e., magnesium oxyde with varying amounts of sodium hydroxyde, sodium carbonate, potassium hydroxyde or potassium carbonate. Increasing proportions of magnesium oxide resulted in lower ash content. Further reduction in ash content was achieved by use of ion-exchange resins. Finally, since it is imperative that the chrome cake that is being recovered can be recycled, a chemical treatment was developed in which the chrome cake is dissolved in acid and the extraneous materials are eliminated by precipitation with base. En ligne : https://drive.google.com/file/d/1qiE6ywR0qOsG7oApvA7hUrIf9EWXn5Ry/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8153 [article]

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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)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 81, N° 1 (01-02/1997) . - p. 5-13 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8075 [article]

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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)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXIX, N° 7 (07/1994) . - p. 215-220 Titre : Molecular size and conformation of protein recovered from chrome shavings Type de document : texte imprimé Auteurs : Eleanor M. Brown, Auteur ; C. J. Thompson, Auteur ; Maryann M. Taylor, Auteur Année de publication : 1994 Article en page(s) : p. 215-220 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Partially hydrolyzed collagen is one product of the treatment for chrome shavings developed in this laboratory. The value of this process to the tanner depends, in part, on the market value of this proteinaceous material. Modification of the process at any of several points may alter the characteristics of the protein product and thus improve its market potential. The molecular size of the collagen fragments and thermal stability of collagen-like conformations are both factors in determining possible uses for this material. Polyacrylamide gel electrophoresis SDS-PAGE) was used to analyse the protein fragments. These fragments were extracted from chrome shavings with NaOH, KOH or the respective carbonates. Results of these analyses showed a wide dispersion of molecular weights in all of the samples with the heaviest concentrations in the 100-200 kDa and 50-100 kDa fractions. About 25% of the protein was degraded into fragments ≤50 kDa and a smaller portion was in the form of aggregates ≥200 kDa. When aqueous solutions were held at 5°C for at least 15 hrs, these protein fractions developed 30-60% of the triple helical conformation of a comparable concentration of native collagen as measured by circular dichroism. All fractions extracted with MgO/carbonate mixtures developed more than 50% helical structure while those extracted with MgO/hydroxyde mixtures developed 30-50% helix. Melting points for the helix to coil transition were 22°C ± 2°C for all samples studied. En ligne : https://drive.google.com/file/d/1jwICyeh11Sk0iMxfCDVhdp9i9iphMtY3/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8061 [article]

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