An analytical method for determining formates in chrome recycling liquors / Elton L. Hurlow in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 72 (Année 1988)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 72 (Année 1988) . - p. 19-26 Titre : An analytical method for determining formates in chrome recycling liquors Type de document : texte imprimé Auteurs : Elton L. Hurlow, Auteur Année de publication : 1988 Article en page(s) : p. 19-26 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Recycled chrome tanning liquors containing formate as masking agent have to be accurately fortified betweencycles to ensure consistent results. Up to now, residual formate concentrations have been guessed at because there has been no easy, quantitative assay for formate insuch recycle liquors.This work derives a suitable gas chromatographic method which measures formate directly using thermal conductivity detection. Temperature and pH are shown to affect the elution profile and it was found best to separate formate on a poropak N column from a filtered (0.45 µm) solution at a pH>2 and oven temperature of 160°C. Unknown formate concentrations are read off directly from a linear, standardised graph. The measurements were shown to be quantitative and the method easy to perform. En ligne : https://drive.google.com/file/d/1mdYr5eD-yXPqRlFiPXeptJK06OR0ww97/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9090 [article]

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Antibiotics in hide preservation and bacteria control / George Stockman in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 2 (02/2007)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 2 (02/2007) . - p. 62-67 Titre : Antibiotics in hide preservation and bacteria control Type de document : texte imprimé Auteurs : George Stockman, Auteur ; Dean Didato, Auteur ; Elton L. Hurlow, Auteur Année de publication : 2007 Article en page(s) : p. 62-67 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The use of antibiotics requires careful deliberation regarding both the criteria for their selection and the methodology of their application. Certain widely available antibiotics, including Doxycycline HCl, have demonstrated activity for short-term preservation of fresh hides. By eliminating the requirement of dry salt or brine curing, there are potential major benefits from reduced environmental burden. When used in the soak, such antibiotics may prove to be an economical alternative to conventional antimicrobials currently used for this purpose. However, evaluation of the use of clinically significant antibiotics must take into consideration other factors besides efficacy in hide preservation or bacterial protection during soaking. In particular, we must consider potential long-term risks associated with non-therapeutic applications of molecules that have been shown to be effective human antibiotics. Before adopting widespread use of clinical antibiotics in hide preservation and soaking, it would be sensible to weigh the benefits and the potential consequences of such uses in the broadest context of global health, politics, and business decision-making. This paper will explore the use of antibiotics in industry and will discuss widely differing viewpoints on the subject. The widespread use of antibiotics for promotion of the general health and growth of food-producing animals will be reviewed. Such uses account for approximately 70% of the antibiotics and other antimicrobials used in the United States and are the subject of vigorous ongoing debate. Antibiotic usage for hide preservation and soaking protection will likely undergo similar scrutiny. Clear guidance has been provided by the World Health Organization Alliance for the Prudent Use of Antibiotics. Adoption of these policies by nations around the world is occurring at a slow yet measured pace. Industrial uses of antibiotics offer obvious immediate environmental benefits, offset by possible long-term compromised viability against significant human diseases. This disparity presents members of the hide and leather industries with an interesting opportunity to test Environment, Safety and Health Policies, as well as Corporate Vision. En ligne : https://drive.google.com/file/d/1DGTlz6V8cpE8TN8kf2SpdZMf_DZa6o5i/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3369 [article]

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Fungal growth on wetblue : methods to measure impact on leather quality / L. Zugno in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 1 (01/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 1 (01/2011) . - p. 1-7 Titre : Fungal growth on wetblue : methods to measure impact on leather quality Type de document : texte imprimé Auteurs : L. Zugno, Auteur ; Elton L. Hurlow, Auteur ; D. Oppong, Auteur Année de publication : 2011 Article en page(s) : p. 1-7 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Champignons microscopiques Cuir Qualité -- Contrôle Séquençage des acides nucléiques Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Wild and known fungal species were selected to inoculate a standardized wetblue leather and various methods were then employed to quantify the concomitant damage associated with mold growth.Fungi were isolated from commercially tanned samples of contaminated wetblue and pure strains were sourced from ATCC cultures.Test cuttings of wetblue leather were inoculated with the selected cultures and incubated along with matched control cuttings for a period of 90 days.Unknown wild strains were later identified using DNA squencing techniques.Microscopic observations of all treated versus control samples did not show any difference in grain structure or skin morphology,indicating little or no breakdown of intact and tanned collagen structures.Various staining and analytical assay techniques indicated significant reduction in fatty material content in the treated samples compared with the untreated controls. En ligne : https://drive.google.com/file/d/1Ao1VhiFBTZxGz4uRG7aprqovDA1uwn82/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10518 [article]

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A new antifungal agent for the leather industry : S-Hexyl-S'-Chloromethyl-cyanodithiocarbimate (CHED) / Stephen D. Bryant in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 95, N° 1 (01-02/2011)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 95, N° 1 (01-02/2011) . - p. 7-10 Titre : A new antifungal agent for the leather industry : S-Hexyl-S'-Chloromethyl-cyanodithiocarbimate (CHED) Type de document : texte imprimé Auteurs : Stephen D. Bryant, Auteur ; Elton L. Hurlow, Auteur ; Marilyn Whittemore, Auteur Année de publication : 2011 Article en page(s) : p. 7-10 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antifongiques Cuirs et peaux -- Conservation Cyanodithiocarbimates Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Raw hides are a rich source of fats and proteins that may serve as metabolic substrates for micro-organisms, especially bacteria and fungi. These micro-organisms that are capable of invading the hide for its nutrients are present on the fresh hide during harvest as well as from the surrounding environment during and after processing at the tanner. Fungal attack on tanned collagen changes the chemical composition of the pelt in the area of growth. These changes along with fungal pigmentation will usually cause discolouration or spots or various colours depending on the infesting organism. This fungal discolouration is difficult to correct and can spoil crust or finished leather. To protect tanned hides (such as wet-blues, vegetable-tanned, free-of-chrome, or oil-tanned lathers), a fungicide is added during the pickle or tanning process. The fungicide must survive the conditions of tannage and adhere to the surface of the tanned hide to protect the leather from the time the tanningprocess is complete until the tanned hide is processed further and finished into a dry leather product. In order to be effective for the leather industry the fungicide should be stable under acid conditions, reasonably stable to UV-light, relatively unreactive with other tanning process chemicals, andhave a high affinity for the hide or skin substrate. Historically the leather industry made use of chemistries such as organomercurials and chlorophenates which are now banned because of high level dangers regarding environment and human exposure. In recent decades these have been replaced with effective and safer chemistries such as : 2-(thiocyanomethylthio)bentothiazole (TCMTB), 3-iodopropynylbutylcarbamate (IPCB), n-octylisothiazolinone (OIT), diiodomethyl-p-tolylsulfone (DIMTS), and some phenolics. A needs exists in the leather industry for new compounds that not only are effective fungicides, but also survive the chemical environment of the tanning process. In addition, a valuable strategy for microorganism control is to combine two ormore microbicides to expand the spectrum of control as well as to exploit potential synergies in the biocidal actions This paper describes chemical, biological, and toxicological properties of a new antifungal compound in a class of chemistry known as cyanodithiocarbimates. A patent for the use of this chemistry as a fungicide in the lather industry has been granted. En ligne : https://drive.google.com/file/d/13WPPwLTSkbZpqPvi5mpRyBNX55JUWBD7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10814 [article]

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The effect of polymeric phosphate chain length on shrinkage temperature and vegetable tanning penetration / Elton L. Hurlow in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXI (Année 1986)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXI (Année 1986) . - p. 197 - 207 Titre : The effect of polymeric phosphate chain length on shrinkage temperature and vegetable tanning penetration Type de document : texte imprimé Auteurs : Elton L. Hurlow, Auteur ; David A. Boast, Auteur ; Stanley G. Shuttleworth, Auteur Année de publication : 1986 Article en page(s) : p. 197 - 207 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The use of linear polyphosphates as pretannages for promoting quick vegetal tanning penetration rates has proceeded without much consideration of the theoretical aspects of polyphosphate chain length mediation of penetration. Polyphosphates are available in a range of chain lengths and empirical evidence suggests those of between 5 and 15 phosphate units as most beneficial. Polyphosphates are known to increase shrinkage temperature and this is shown to occur with increasing chain length. Consideration of spatial dimensions together with experimental evidence allows a theory to be proposed accounting for polyphosphates in sufficient intermolecular crosslinking occurs to prevent acidic swelling of the fibres and a low degree of permeability results. With very large polyphosphates there is sufficient multipoint intermolecular binding to suppress swelling but the physical size of the bound polyphosphates block the access channels available for vegetable tanning penetration and hence result in slow rates of penetration. Medium chain length polyphosphates exhibit sufficient intermolecular crosslinking potential to inhibit swelling but are small enough to allow the quick passage of vegetable tanning into the interior of the hide. En ligne : https://drive.google.com/file/d/1EMmoHcRj2-S4c-sQuBagQTZORnXXoFcM/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9173 [article]

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The value of leather as a component brand "... and what are we doing about it ?" / Elton L. Hurlow in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 9 (09/2013)  

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