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Isolation of protein products from chromium-containing leather waste using two consecutive enzyme and purification of final chromium product : pilot plant studies / Luisa F. Cabeza in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 83, N° 1 (01-02/1999)
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Titre : Isolation of protein products from chromium-containing leather waste using two consecutive enzyme and purification of final chromium product : pilot plant studies 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. 14-19 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this paper, the pilot plant trials of a process to treat shavings to isolate protein products and purified chromium are presented. The process uses two enzymes, pepsin and alkaline protease, in two consecutive extractions with the isolation of a high quality gelatin and a hydrolysate. Chrome shavings (10 kgs) are pretreated with 0.1 % pepsin at pH 3-3.5 and at room temperature for 8 hours and gelatin is then extracted at pH 8 and 70°C ; hydrolysed protein is then isolated with 0.005 % alkaline protease at pH 8 and 70°C for 3 hours. The remaining solid, called chrome cake, is chemically treated to prepare it for recycling in the tanning industry. THe chemical and physical properties of the protein products and the chemical characteristics of the purified chromium are presented. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7852
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 83, N° 1 (01-02/1999) . - p. 14-19[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007023 - Périodique Bibliothèque principale Documentaires Disponible Leather made from the hides of double-muscled cattle has satisfactory physical characteristics / S. M. Mozersky in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 10 (10/2001)
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Titre : Leather made from the hides of double-muscled cattle has satisfactory physical characteristics Type de document : texte imprimé Auteurs : S. M. Mozersky, Auteur ; Susan K. Iandola, Auteur ; William N. Marmer, Auteur Année de publication : 2001 Article en page(s) : p. 393-397 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Because of the relatively high efficiency with which they produce lean meat, two breeds of cattle which exhibit a high frequency of muscle hypertrophy (mh, commonly referred to as "double muscling"), viz., Piedmontese and Belgian Blue, are being considered for commercial breeding as beef animals. Double muscling results from a genetic deficiency of myostatin, the protein which normally regulates, i.e., limits, muscle growth. Since "double-muscled" animals have a somewhat larger than normal physique, and since the effect of myostatin deficiency is reasonably presumed to include hypertrophy of muscle tissue in the hide, it became important to determine whether the hides of such animals are affected by the condition and would yield leather with unusual, e.g., deficient, physical characteristics. To address this question the physical characteristics of leathers made from the hides of homozygous normal (+/+), homozygous myostatin deficient (mh/mh), and heterozygous (+/mh) cattle were compared to each other. No significant differences between the groups were found, except that leather made from mh/mh cattle had a slightly greater stiffness than leather made from +/+ cattle. Double muscling thus poses no threat of harm (or promise of substantial benefit) to the leather manufacturer which would require monitoring hides from animals endowed with this condition. En ligne : https://drive.google.com/file/d/1p0HHdV_-gw0HW4lnANeaJDLuTh-YoN3V/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4361
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVI, N° 10 (10/2001) . - p. 393-397[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001567 - Périodique Bibliothèque principale Documentaires Disponible Mathematical model of raw hide curing with brine / Eduard Hernà ndez Balada in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 5 (05/2008)
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Titre : Mathematical model of raw hide curing with brine Type de document : texte imprimé Auteurs : Eduard Hernà ndez Balada, Auteur ; Robert L. Dudley, Auteur ; Peter H. Cooke, Auteur ; Karel Kolomaznik, Auteur ; William N. Marmer, Auteur Année de publication : 2008 Article en page(s) : p. 167 - 173 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The most common method of preserving raw hides is brine curing with sodium chloride. However, this process has three important disadvantages : first, the length of time that it takes, which is a minimum of 18 hours ; second, the insufficient degree of curing reached in some hides due to an overload and possibly the low efficiency of the brine raceway ; and finally, the environmental impact associated with the discharge of large quantities of electrolytes in the soaking step. Our long term goal is to address all three issues. Initially, we have carried out a study of the salt uptake and its diffusion mechanism in order to attempt a reduction in the curing time. A continuous reaction mathematical model of a closed one dimensional system that describes the diffusion of sodium chloride in the hide during the curing process was chosen in the search for the optimum brine curing conditions such as the optimum brine concentration and percent float. The effect of these two parameters on the values of transport coefficient lambda was reported. Brine diffusion into the hide was tracked by measurement of the chloride concentration of the residual brine solution. In addition, a piece of hide was cured with a fluorescently labeled brine solution and analyzed by means of epifluorescent microscopy for direct visualization of the sodium location within the hide. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2563
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Code-barres Cote Support Localisation Section Disponibilité 010088 - Périodique Bibliothèque principale Documentaires Disponible Molecular weight distribution and functional properties of enzymatically modified commercial and experimental gelatins / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 3 (03/2004)
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Titre : Molecular weight distribution and functional properties of enzymatically modified commercial and experimental gelatins Type de document : texte imprimé Auteurs : Maryann M. Taylor, Auteur ; Eleanor M. Brown, Auteur ; William N. Marmer, Auteur Année de publication : 2004 Article en page(s) : p. 129-141 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Prior research from this laboratory has demonstrated that commercial gelatins can be modified with a microbial transglutaminase with a resulting effect on their physical properties. The gels isolated from those treatmentshad improved physical properties and films prepared from these modified products had superior mechanical properties. In this present study we modified commercial gelatins and experimental gelatin products isolated from chromium-containing tannery waste and examined the functional properties as well as their molecular weight distributions. On increasing the enzyme concentration, the gelatins become highly polymerized, some to such high molecular weight that the moieties will either not go into the SDS-PAGE gel or, because of their insolubility, cannot even be applied to the gel. Physical, foaming, adhesive and water absorption properties of enzymatically-modified gelatins were improved. The extent of modification of the resulting products was demonstrated by the molecular weight distribution studies and these correlated with changes in physical and functional properties. A particular advantage to using this enzymatic modification was the improvement in physical properties imparted to low quality gelatins. The modified protein has applications in a wide range of products, including adhesives, cosmetics, films, encapsulating agents, fertilizers, and--of significance to the leather industry--as coatings or fillers. En ligne : https://drive.google.com/file/d/1Ps5menD0AxS1k2U5xRLRMmvlbuSJJjQs/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4187
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 3 (03/2004) . - p. 129-141[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001599 - Périodique Bibliothèque principale Documentaires Disponible Monitoring of available decorin in different parts of bovine hide during its processing into leather / Mila L. Adelma-Ramos in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 12 (12/2007)
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Titre : Monitoring of available decorin in different parts of bovine hide during its processing into leather Type de document : texte imprimé Auteurs : Mila L. Adelma-Ramos, Auteur ; Renée J. Latona, Auteur ; William N. Marmer, Auteur Année de publication : 2007 Article en page(s) : p. 404-407 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : During conversion of hides into leather, some hide constituents undergo changes and removal. Among those are decorin, biglycan, sulfated glycosaminoglycan (SGAG) and collagen. Properly monitoring the removal of the predominant and best understood proteoglycan of skin, decorin, was the focus of this work. An ELISA method was improved by dialyzing the guanidineHCl-extracted proteins in the presence of collagenase, allowing us to obtain a more manageable sample with uniform background and in turn more reliable analytical data. ELISA results on the depletion of decorin in intact hide samples were evaluated and compared among the different parts of bovine hide before and after dialysis. There was a clear difference between undialyzed and dialyzed samples of raw intact hide, whereas after the tanning treatments, the available decorin content was significantly the same from different parts. The amount of decorin that was removed from each area of the hide (shoulder > butt > belly), after processing them using the standard USDA tanning procedure, was directly proportional to the initial amounts. The final available decorin remaining per gram of intact hide in leather (bated samples) was significantly the same in all parts. Based on the dialyzed samples, there was about a 70-78% reduction of available decorin content from raw hide to bated hide samples compared to ~90% in undialyzed samples. The results followed more closely the trend of the SGAG (carbohydrate part of decorin) content determination previously reported by this group, where about a 75% drop was observed from the initial available SGAG content in raw hide to bated hide samples. En ligne : https://drive.google.com/file/d/13MHioiCW8z_fbzauY9AhYAi5xv90i2XT/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3317
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 12 (12/2007) . - p. 404-407[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 008989 - Périodique Bibliothèque principale Documentaires Disponible 009740 - Périodique Bibliothèque principale Documentaires Disponible Overview of the USDA hides and leather reseach program / William N. Marmer in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 3 (03/2001)
PermalinkOxidative dehairing by sodium percabonate / William N. Marmer in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 11 (11/2005)
PermalinkPotential application for genipin-modified gelatin in leather processing / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 3 (03/2009)
PermalinkPotential 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)
PermalinkPreparation and characterization of biopolymers derived from enzymatically modified gelatin and whey / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 6 (06/2006)
PermalinkProcess simulation and cost estimation of treatment of chromium-containing leather waste / Luisa F. Cabeza in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIII, N° 10 (12/1998)
PermalinkProduction and potential uses of co-products from solid tannery waste / Eleanor M. Brown in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXXI, N° 10 (10/1996)
PermalinkRapid oxidative dehairing using alkaline hydrogen peroxide and potassium cyanate : reuse of the dehairing reagents / William N. Marmer in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 5 (05/2005)
PermalinkRapid oxidative dehairing with magnesium peroxide and potassium peroxymonosulfate / Andrew G. Gehring in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 9 (09/2006)
PermalinkRapid oxidative unhairing with alkaline calcium peroxide / Andrew G. Gehring in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 6 (06/2003)
PermalinkRapid oxidative unhairing with alkaline hydrogen peroxide / William N. Marmer in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 9 (09/2003)
PermalinkRemoval of available decorin core-protein from powdered bovine hide by treatments used to process intact hides into leather / S. M. Mozersky in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 7 (07/2007)
PermalinkThe oxidative degradation of keratin (wool and bovine hair) / William N. Marmer in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 11 (11/2006)
PermalinkThe use of oxidative chemicals for the removal of hair from cattle hides in the beamhouse / William N. Marmer in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 9 (09/2004)
PermalinkTreatment of sheepskin chrome shavings. Isolation of high value protein products and reuse of chromium in the tanning process / Luisa F. Cabeza in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIV, N° 7 (09/1999)
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