Characterization of products isolated by enzyme treatment of chromium-containing leather waste / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVII, N° 10 (10/1992)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXVII, N° 10 (10/1992) . - p. 380-388 Titre : Characterization of products isolated by enzyme treatment of chromium-containing leather waste Type de document : texte imprimé Auteurs : Maryann M. Taylor, Auteur ; Edward J. Diefendorf, Auteur ; Eleanor M. Brown, Auteur ; William N. Marmer, Auteur Année de publication : 1992 Article en page(s) : p. 380-388 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Enzymic processing of chrome shavings and trimmings has previously been shown to be a viable treatment of this substantial waste product generated by the tanning industry.Characterization of the chrome cakes ant the protein generated by these treatments was an important next step in this research.Tanneries use different type of processes to tan the leather and these varying processes are dependent on the type of chrome should be present in the effluent.Chrome shavings were obtained from three tanneries.The blue stock had been processed by conventional, albeit different, tannages.For optimal solubility, an individual pretreatment was developed for each type of shavings.They were then treated enzymically and the chrome cake and the protein fraction were isolated.Analyses of the shavings,the chromium-containing cakes and the protein fraction showed that chromium containing leather waste from a variety of sources can be enzymically digested when the appropriate pretreatment is performed.The chemical composition of the isolated products is dependent on the type of treatment and on the composition of the original chromium-containing leather waste product. En ligne : https://drive.google.com/file/d/10VQ5_h8DSqgvmHLdCL5fTyHAm3Cde5px/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8283 [article]

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Crosslinking of collagen with acrylamide derivatives. 3 : Improved chrome tannage by collagen modification / F. Scholnick in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVI, N° 6 (06/1991)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXVI, N° 6 (06/1991) . - p. 193-198 Titre : Crosslinking of collagen with acrylamide derivatives. 3 : Improved chrome tannage by collagen modification Type de document : texte imprimé Auteurs : F. Scholnick, Auteur ; Edward J. Diefendorf, Auteur ; Stephen H. Feairheller, Auteur ; Paul L. Kronick, Auteur Année de publication : 1991 Article en page(s) : p. 193-198 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The Michael Reaction has been used with an acrylic-acid derivative to provide additional carboxyl binding sites on collagen during processing of hides into leather. The crosslinked product had a higher shrinkage temperature and a considerably lower lysine and hydroxylysine content than conventionally processed hides. Subsequent tanning led to a higher chrome uptake than that found in the untreated control. The results indicated that both direct crosslinking and improved chrome tanning are possible with this derivative but that these are accompanied by some loss of tensile strength En ligne : https://drive.google.com/file/d/1B2RiLHhKURvVOJE4M_0wUHDk_BoPn5zo/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8493 [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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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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Effect of various alkalinity-inducing agents on chemical and physical properties of protein products isolated from chromium-containing leather waste / Maryann M. Taylor 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. 221-228 Titre : Effect of various alkalinity-inducing agents on chemical and physical properties of protein products isolated from chromium-containing leather waste Type de document : texte imprimé Auteurs : Maryann M. Taylor, Auteur ; Eleanor M. Brown, Auteur ; William N. Marmer, Auteur ; Edward J. Diefendorf, Auteur Année de publication : 1994 Article en page(s) : p. 221-228 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : We have demonstrated that gelable and hydrolyzed protein products can be obtained from chromiumcontaining leather waste. Depending on the choice of alkalinity-inducing agent added, products with varying chemical and physical properties can be isolated. Also, we have shown that the ash content of these isolated protein products will be dependent not only on the choice of alkalinity-inducing agent, but also on the chemical make-up of the original substrate. One of the components of the ash is chromium and its content is also influenced by the choice of alkalinity-inducing agent. We found that adding magnesium oxide in combination with sodium or potassium hydroxide increases the chromium content in the gelable protein products over that obtained with magnesium oxide alone. Substituting carbonate salts for sodium or potassium hydroxide lowers the chromium content of the gelable protein products. Choice of alkalinity-inducing agent has little effect on the chromium of the hydrolyzed protein products. With respect to Bloom value and viscosity of the gelable protein products, magnesium oxide alone give the superior product, whereas the introduction of carbonates and hydroxides has a detrimental effect. Hydroxide is more detrimental than carbonate. In this study we have shown that a variety of products can be isolated with varying properties and these properties will be dependent on the desired end use of the protein product. En ligne : https://drive.google.com/file/d/1Fc8iKyYcnR6F42FZJIG5D9JC1hvvdpdn/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8071 [article]

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Efficiency of enzymic solubilization of chrome shavings as influenced by choice of alkalinity-inducing agents / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVI, N° 6 (06/1991)  

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Enzymatic treatment of offal from fleshing machines / M. M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIV (Année 1989)  

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Enzymic treatment of chrome shavings / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXV (Année 1990)  

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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)  

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A method of processing fresh butcher-hogskins / William J. Hopkins in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXX (Année 1985)

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Radiation-cured coatings for leather. II. color coats for side leather / F. Scholnick in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIII (Année 1988)  

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Wet process technology I. determination of precision for various analytical procedures / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXI (Année 1986)  

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Wet process technology II. the effect of process variations on hides and effluents + / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXI (Année 1986)  

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Wet process technology III. development of a standard process / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXI (Année 1986)  

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Wet process technology IV. Evaluation of an alternative deliming agent / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIII (Année 1988)  

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