Application of molecular techniques to identify bacteria isolated from the leather industry. Discussion / David Oppong in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 4 (04/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 4 (04/2006) . - p. 140-145 Titre : Application of molecular techniques to identify bacteria isolated from the leather industry. Discussion Type de document : texte imprimé Auteurs : David Oppong, Auteur ; Stephen D. Bryant, Auteur ; Ravindran Rangarajan, Auteur ; Susan Steele, Auteur ; David Radwell, Auteur ; Lori Hyllengren, Auteur Année de publication : 2006 Article en page(s) : p. 140-145 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : DNA-based methods are known to be accurate, precise and rapid in identifying bacteria but there is little information about the use of these techniques in the leather industry. A study was undertaken to investigate and characterize the bacterial contaminants of fresh hides using 16S ribosomal RNA sequencing techniques. The proteolytic activities of these isolates were also studied using different substrates. Organisms belonging to 16 different genera of bacteria were isolated, and many of the species found have not been previously reported for this environment. Some of the species of bacteria being reported for the first time in the tanning environment included Janibacter terrae, Acidovorax sp., Dietzia maris, Arthrobacter pr tophormiae, Comamonas sp., Brevibacterium lutescens, Jeotgalicoccus psychrophifus, Nocardiopsis sp., Delftia acidovorans, Pseudomonas cannabina, Pseudomonas fulgida and certain species of Aeromonas and Acinetobacter. Most species of bacteria found in the incoming process water were non-proteolytic. Analysis of fresh hides revealed a large number of both proteolytic and non-proteolytic bacteria. The proteolytic bacteria included several species of Aeromonas, Proteus vulgaris, and Shewanella putrefaciens. Pseudomonas sp. were common but not all of them showed proteolytic activity. Knowledge about the identities and proteolytic activities of these organisms that occur in this environment would provide a better way to design programs to control theirundesirable activities. En ligne : https://drive.google.com/file/d/1W6m6QBqQgEHmOjGdvy_Z9dJA7dyTqpd0/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4017 [article]

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Recent developments in the short-term preservation of cattle hides / Dean Didato in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 11 (11/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 11 (11/2008) . - p. 383-392 Titre : Recent developments in the short-term preservation of cattle hides Type de document : texte imprimé Auteurs : Dean Didato, Auteur ; George Stockman ; Susan Steele, Auteur Année de publication : 2008 Article en page(s) : p. 383-392 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Every year substantial dollar losses inhide value occur in the United States that are directly attributable to the combined effects of hide autolysis and bacterial degradation. Much of this value could be recovered through the effective application of short-term preservation chemicals immediately after slaughter. Two areas of critical importance for recoverig hide value are inrural (i.e., small sources such as farms or local butchers) hide collection and inscheduling the processing of fresh hides. A two to three day delay in curing is to known adversely affect grain quailty on rural collection hides, especially in hot weather. Even good quality packer hides delayed in delivery or just delayed in process over a weekend can result in a loss of grain quality. To adress these needs, we have evaluated a wide range of generally regarded as safe (GRAS) and non-GRAS preservation treatments. Collagenase inhibitors have been incorporated to reduce grain damage from autolysis as well as damage from bacterial enzymes post-slaughter. Thus, we were able to extend the "shelf-life" of fresh hides by three to six days and prevent loss in hide value. Several GRAS and non-GRAS chemical combinations achieved the desired results during bench scale testing and the data obtained will be discussed. Larger scale field-testing is in progress and details on these trails will be presented. En ligne : https://drive.google.com/file/d/1Fm4h0De06fq2qnxeEpbv5KhcwU2O53Ej/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3025 [article]

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Soaking : Balancing operational and quality issues using both fresh and brine cured hides / George Stockman in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 3 (02/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 3 (02/2008) . - p. 76-85 Titre : Soaking : Balancing operational and quality issues using both fresh and brine cured hides Type de document : texte imprimé Auteurs : George Stockman, Auteur ; Dean Didato, Auteur ; Susan Steele, Auteur ; Chris Black, Auteur ; Ron Allison, Auteur Année de publication : 2008 Article en page(s) : p. 76-85 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux Cuirs et peaux de bovins Hyaluronique, acide L'acide hyaluronique est un type de polysaccharide (plus précisément une glycosaminoglycane) non fixé à une protéine centrale et largement réparti parmi les tissus conjonctifs, épithéliaux et nerveux animaux. Il se trouve notamment dans l'humeur vitrée et le liquide synovial. Il est l'un des principaux composants de la matrice extracellulaire ainsi que de certaines mucoprotéines lorsqu'il est associé à une fraction protéique. Depuis les années 1990, il est très utilisé dans divers dispositifs médicaux, médicamenteux et cosmétiques (présenté dans ce dernier cas comme "antistatique, humectant, hydratant, conditionneur cutané, anti-âge, etc."), bénéficiant d'un effet de mode grandement soutenu par une large publicité commerciale. Contribuant de façon significative à la prolifération et à la migration des cellules, l'acide hyaluronique est aussi impliqué dans la progression de certains cancers. (Wikipedia) Mesure Peaux brutes -- Trempe Saumurage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The past three decades have heralded dramatic changes in raw material for tanning in the U.S. Modern blueing facilities lie close to the source of hides and are either captive to the packinghouses or have established long-term contracts for purchase and receipt of the fresh hides on a continuing basis. Typically, tanners are required to receive the hides daily, in concert with the slaughter schedule, with little to no variance possible. Tanners often process both brine cured hides as well as fresh, thus optimizing time management and production demands. It is commonly accepted that variations in processing time, float, type of equipment (paddle or drum), bactericide, pH, wetting agents and protease-based enzymes are necessary in response to both end-product requirements as well as raw material. Little has been reported in the technical literature, on modern soaking practices and their relationship to the shift in our major raw material. This paper compares contemporary soaking practices to historical methods, emphasizing those aspects that are widely acknowledged as critical for optimization of beamhouse chemistry. We examine current practice and challenge the commonly accepted measurements used to measure optimal soaking of fresh and brine cured hides. We reveal differences with respect to removal of the non-collagenous hide component, hyaluronic acid for various process chemistries on both fresh and cured cattlehides. Note de contenu : - Laboratory trials - Tannery trials - Measuring hyaluronic acid En ligne : https://drive.google.com/file/d/1zjsmLf4xfH5PxoHGMziKvXxIUnrzaW9v/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39779 [article]

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What do tanners know about soaking ? / George Stockman in LEATHER INTERNATIONAL, Vol. 213, N° 4808 (04/2011)  

[article]  inLEATHER INTERNATIONAL > Vol. 213, N° 4808 (04/2011) . - p. 32-34 Titre : What do tanners know about soaking ? Type de document : texte imprimé Auteurs : George Stockman, Auteur ; Dean Didato, Auteur ; Susan Steele, Auteur ; Buckman, Auteur ; Chris Black, Auteur ; Ron Allison, Auteur Année de publication : 2011 Article en page(s) : p. 32-34 Langues : Anglais (eng) Catégories : Peaux brutes -- Trempe Index. décimale : 675 Technologie du cuir et de la fourrure En ligne : https://drive.google.com/file/d/1IU4uo5phUaeetSWLqzgjo53unXykHqiE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11668 [article]

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