Electron beam irradiation preservation of cattle hides in a commercial-scale demonstration / David G. Bailey in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 10 (10/2001)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVI, N° 10 (10/2001) . - p. 382-392 Titre : Electron beam irradiation preservation of cattle hides in a commercial-scale demonstration Type de document : texte imprimé Auteurs : David G. Bailey, Auteur ; Gary L. DiMaio, Auteur ; Andrew G. Gehring, Auteur ; Graeme D. Ross, Auteur Année de publication : 2001 Article en page(s) : p. 382-392 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In 1999, the USDA approved the use of electron beam and gamma ray irradiation for the cold pasteurization of red meat including the elimination of E. coli O157-H7 in hamburger. Titan, Incorporated, of San Diego has contracted with a major red meat producer to construct the first electron beam irradiation facility dedicated to this purpose. This opens up the possibility of applying electron beam technology to preserve cattle hides in order to eliminate environmentally hazardous brine curing in these same packing plants. With this in mind, Titan entered into a Memorandum of Understanding with the Agricultural Research Service to conduct an industrial-scale evaluation of the use of electron beam irradiation for cattle hide preservation. We have conducted a one-hundred-and-fifty-hide matched-side experiment to evaluate preservation, leather quality and yield of electron-beam-preserved cattle hides as compared to brine-cured hides. The hides in this study were individually identified immediately after slaughter in Schuyler, NE, trucked to a tannery in St. Joseph, MO, to prepare them for irradiation, trucked to Cranbury, NJ, for irradiation and then returned to St. Joseph to be tanned. A total of three weeks elapsed between hide removal and tanning. After storage at room temperature, all of the hides appeared to be as fresh and clean as they were just after flaying. Weight, area and visual quality were measured at various stages throughout the process. With the exception of draw, which was considerably better on the irradiated sides compared to the brine sides, all of the parameters measured were equivalent for both preservation treatments. An analysis of the results obtained will be presented along with the potential impact of cattle hide irradiation on the tanning and packing industries. En ligne : https://drive.google.com/file/d/1djIQkTZvlO7uOhm9HLdIHqmGFFScmUsA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4360 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001567	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Evaluation of urea sulfate as a replacement for sulfuric acid in chrome tanning / Andrew G. Gehring in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 7 (07/2001)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVI, N° 7 (07/2001) . - p. 268-274 Titre : Evaluation of urea sulfate as a replacement for sulfuric acid in chrome tanning Type de document : texte imprimé Auteurs : Andrew G. Gehring, Auteur ; David G. Bailey, Auteur ; Gary L. DiMaio, Auteur Année de publication : 2001 Article en page(s) : p. 268-274 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Concentrated sulfuric acid is a noxious and corrosive chemical that must be handled with extreme care by workers in the leather tanning industry. A safe alternative to sulfuric acid in the chrome tanning process would be desirable if the alternative was demonstrated to be an equally efficient replacement. Small steer hide pieces (unhaired and bated) were treated with either sulfuric acid or urea sulfate, converted into leather, and physically tested in a laboratory bench scale study. Large hide pieces (unhaired and bated matched sides) were chrome-tanned in a pilot plant, again to compare sulfuric acid with urea sulfate. This paper documents that physical testing (hide swelling, shrinkage temperature, stress/strain, quantification of chromium uptake) results exhibited no remarkable difference between either the sulfuric acid or urea sulfate treated hide pieces. These results demonstrate that urea sulfate would be an acceptable alternative for sulfuric acid should circumstances (economic, legally mandated environmental protection issues, safety, etc.) warrant it. En ligne : https://drive.google.com/file/d/1F1ORzM0qgm5ym_zHKOU_ZI4Fjq9TF5m1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4370 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001565	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Evaluation of urea sulfate as a substitute for formic acid in the retan, color, and fatliquor process / Andrew G. Gehring in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 9 (09/2001)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVI, N° 9 (09/2001) . - p. 333-342 Titre : Evaluation of urea sulfate as a substitute for formic acid in the retan, color, and fatliquor process Type de document : texte imprimé Auteurs : Andrew G. Gehring, Auteur ; David G. Bailey, Auteur ; Jeanette M. Cardamone, Auteur ; Gary L. DiMaio, Auteur Année de publication : 2001 Article en page(s) : p. 333-342 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Formic acid is a noxious and corrosive chemical that must be handled with extreme care by workers in the leather tanning industry. A safe alternative to formic acid in the retan, color, and fatliquor process would be highly desired if the alternative was not only demonstrated to be an equally efficient but also a cost effective replacement. Commercially prepared wet blue (bovine origin) was subjected to the retan, color, and fatliquor process utilizing either urea sulfate or formic acid during dyeing. The resultant hide pieces were further processed into crust leather. Multiple physical and chemical measurements were performed on the crust to evaluate the effects of formic acid substitution with urea sulfate. Although there were slight differences in perspiration testing and light fastness results, no remarkable difference in dye uptake and color uniformity was observed by substituting formic acid with urea sulfate. However, crust leather was remarkably lighter in coloration when dyed with select dyes in the presence of urea sulfate. Interestingly, hide pieces tended to leach relatively less chromium into dye baths containing urea sulfate. En ligne : https://drive.google.com/file/d/1HfUaGlQw2SN2Df11ekc5MyhbVEdORHhR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4364 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001566	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Improved hide quality and rapid unhairing / Andrew G. Gehring in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 9 (09/2002)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVII, N° 9 (09/2002) . - p. 339-348 Titre : Improved hide quality and rapid unhairing Type de document : texte imprimé Auteurs : Andrew G. Gehring, Auteur ; David G. Bailey, Auteur ; Gary L. DiMaio, Auteur Année de publication : 2002 Article en page(s) : p. 339-348 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The quality of hides suffers from their treatment by the packing industry as a byproduct, at best, of meat production. A meat packing company, Future Beef Operations, LLC (FBO), is changing this mentality by developing a vertically integrated cattle operation in which the hide is a product in its own right. A key component of this innovative operation is the rapid unhairing of stunned cattle carcasses prior to flaying in the slaughterhouse. Since it removes hair-associated manure, dirt, and microorganisms, rapid unhairing greatly reduces the cross-contamination of microorganisms on the hide to the meat, thus serving as a food safety measure while allowing for the rapid grading of hide quality and cost savings in downstream tanning operations. Under a cooperative agreement, Agricultural Research Service and FBO developed an effective rapid unhairing process based upon the earlier work (in 1977) by R. Dorstewitz on a rapid through-feed unhairing system. The rapid unhairing process was refined whereupon optimal conditions included 6.2% sodium sulfide at 35°C applied as a pressurized spray (in two applications) to warmed hide piece samples; an additional spray application of the sodium sulfide was used to remove the partially dissolved hair from the samples and subsequent neutralization of residual sulfide (still on the sample pieces) with 3% hydrogen peroxide was brought about in less than 5 min of total reaction time. The process sufficiently removed hair and hide-associated manure balls, allowing for splitting of green hide. The process was further developed to incorporate the recycling of the unhairing agent (sodium sulfide) and recovery of removed hair. Analysis of the recycled unhairing solution over 16 cycles showed a linear consumption of ca. 20% sulfide with a linear gain of ca. 1% nitrogen (proportional to dissolved hair protein content). En ligne : https://drive.google.com/file/d/1tCGNdYBGlDCDLOD8F1lGYsQdFLfpdSo7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4271 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001578	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Powdered hide model for vegetable tanning / Eleanor M. Brown in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 1 (01/2014)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIX, N° 1 (01/2014) . - p. 8-13 Titre : Powdered hide model for vegetable tanning Type de document : texte imprimé Auteurs : Eleanor M. Brown, Auteur ; Renée J. Latona, Auteur ; Maryann M. Taylor, Auteur ; Andrew G. Gehring, Auteur Année de publication : 2014 Article en page(s) : p. 8-13 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Calorimétrie Collagénases Les collagénases sont des enzymes capables de rompre les liaisons peptidiques du collagène. Elles facilitent la destruction des structures extracellulaires lors de la pathogenèse bactérienne. Ce sont des exotoxines. La production de collagénases peut être induite lors d'une réponse immunitaire, par les cytokines qui stimulent les cellules telles que les fibroblastes et les ostéoplastes et occasionnent indirectement des lésions tissulaires. Collagène Cuirs et peaux Extraction (chimie) Microscopie Molécules -- Modèles Poudre de peaux Quebracho Le quebracho est un arbre à écorce ligneuse, mesurant 30 mètres de haut, à feuilles tannées et à fleurs tubulées blanches. Quebracho est l'un des noms communs, en espagnol, d'au moins trois espèces similaires d'arbres originaires du Gran Chaco, en Amérique latine : Schinopsis lorentzii (quebracho colorado santiagueño), de la famille des Anacardiaceae ; Schinopsis balansae (quebracho colorado chaqueño), de la même famille ; Aspidosperma quebracho-blanco (quebracho blanc), de la famille des Apocynaceae. Ces trois espèces sont riches en tanin et fournissent un bois très dur, particulièrement résistant. Leur nom provient de l'espagnol quiebrahacha, qui signifie brise-hache. Tannage végétal Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : To demonstrate the utility of the powdered hide model for vegetable tanning studies, interactions of quebracho with samples of powdered hide prepared from partially processed hides were investigated. Hides were dehaired by a typical sulfide or oxidative method and carried through the delime/bate step of a tanning process. Prior to tanning, the powdered hide from oxidative dehairing was on average slightly more susceptible to attack by collagenase than was the powdered hide from sulfide dehairing. After tanning with as little as 20% quebracho, powdered hide from both processes was well protected against collagenase degradation. Apparent shrinkage temperatures ranged between 79°C and 87°C , increasing with increased quebracho offer. Shrinkage temperatures for quebracho-treated oxidatively powdered hides were generally 2°C lower than for sulfide dehaired samples. This contrasts with no difference in shrinkage temperature for chrome tanned powdered hides. Comparison of micrographs of powdered hide treated with crude and purified quebracho suggest that the tanning effect of quebracho is both a function of quebracho/collagen interactions, and the filling effect of other components of the crude quebracho. Note de contenu : - EXPERIMENTAL : Materials - Powdered hide preparation - Quebracho purification - Tanning - Analyses : Calorimetry - Microscopy - Collagen Extractibility - Characterization of extracted collagen - RESULTS AND DISCUSSION : Calorimetry - Microscopy - Stability of collagen structure - Susceptibility to collagenase - Molecular model En ligne : https://drive.google.com/file/d/1dL80Ip1n10BCJpDnOUxY_WtC17ueq14W/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20138 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
15863	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Rapid 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)  

Permalink

Rapid oxidative unhairing with alkaline calcium peroxide / Andrew G. Gehring in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 6 (06/2003)  

Permalink

Rapid oxidative unhairing with alkaline hydrogen peroxide / William N. Marmer in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 9 (09/2003)  

Permalink

Unhairing with proteolytic enzymes derived from Streptomyces griseus / Andrew G. Gehring in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 10 (10/2002)  

Permalink

---

1 (1 - 9 / 9)