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Studies on mono and divalent cations effects on hair immunization / Domenico Castiello in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 11 (11/2007)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 11 (11/2007) . - p. 341-346 Titre : Studies on mono and divalent cations effects on hair immunization Type de document : texte imprimé Auteurs : Domenico Castiello, Auteur ; Monica Puccini, Auteur ; Dennis C. Shelly, Auteur ; Sandra Vitolo, Auteur Année de publication : 2007 Article en page(s) : p. 341-346 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Within the studies on the phenomenon of alkali-induced hair immunization, it has been observed that the hair immunization process arising from the action of dibasic alkalis takes place differently than immunization using monobasic alkalis. On the basis of these observations, our work investigated the influence of mono and divalent cations on the hair immunization mechanisms. In our experimental design, fresh salted bovine hides were exposed to mono and divalent alkalis and salts at different concentrations for various time periods. After treatment, the hides were exposed to reducing agents in order to verify the effectiveness of each cation in promoting immunization. We observed that immunization occurs with dibasic cations, but that both a minimum exposure time and a proper alkalinity are required. The appearance of inter and intra polypeptide chain links was investigated by comparing non-immunized and immunized hair using MIR and FIR spectroscopy, ICP chemical analysis and DSC. The chemical and the instrumental analyses indicate that the exposure of hair to divalent cations in alkaline medium, unlike the monovalent cations, induces the formation of cross-links in the keratin structure and promotes immunization. These investigations contribute to confirmation that the immunization process occurs only in the presence of divalent cations. Research work is in progress in order to further understand the nature and the mechanisms of these complex interactions. En ligne : https://drive.google.com/file/d/1Xz8u5bxbOEJcOBfHC3O4GaODxu5KLeur/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3319 [article]

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Unique biocide for the leather industry ; essential oil of oregano / Eser Eke Bayramoglu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 11 (11/2007)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 11 (11/2007) . - p. 347-352 Titre : Unique biocide for the leather industry ; essential oil of oregano Type de document : texte imprimé Auteurs : Eser Eke Bayramoglu, Auteur Année de publication : 2007 Article en page(s) : p. 347-352 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : he Origanum species are subshrubs or perennial herbs with several stems ascending or erect, subsessile or petiolate leaves and flowers in verticillasters aggregated in dense or loose spikes which are arranged in paniculate or corymbiform inflorescence. Oregano essential oil is produced from the oregano plant through the process of steam distillation. There are a variety of species referred to as oregano, but the genus Origanum (tribe Mentheae, Labiatae family) is characterized by a large morphological and chemical diversity: their antimicrobial activities are different from each other. It has already been found that the Origanum minutiflorum essential oil has antifungal activity during pickling and wet blue processes and its effectiveness improves with increasing concentration rates.1 In this investigation, 1% of essential oils from three different oregano species and the oil of Foeniculum vulgare (fennel) were tested for their antimicrobial activity in parallel with 7-25 % phenol and 4-chloro-3-methyl as commercial bactericides commonly used in the leather industry. The results showed that three essential oils of oregano had much stronger bactericidal activity than that of the commercial bactericide and the fennel oil. These findings suggested that these oregano essential oils could be used as bactericidal agents in leather industry. En ligne : https://drive.google.com/file/d/1NQ7BOt687HRse9YCPmpRT_qEwLd8Ix8s/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3320 [article]

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Dialdehyde alginic acid - A novel biopolymeric tanning agent in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 11 (11/2007)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 11 (11/2007) . - p. 353-361 Titre : Dialdehyde alginic acid - A novel biopolymeric tanning agent Type de document : texte imprimé Année de publication : 2007 Article en page(s) : p. 353-361 Note générale : p. 353-361 Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In the present investigation, a new class of tanning agent produced from a renewable biopolymer, alginic acid is reported. Dialdehyde alginic acid (DAA) of different oxidation levels was prepared from alginic acid. DAA at different degree of oxidation was found to be soluble in water. Solubility increased with increase in % oxidized DAA. Treatment of skins with DAA and the effect of the shrinkage temperature of leathers at different oxidation levels of alginic acid were studied. Leathers with 80oC shrinkage temperature have been obtained by tanning at pH 8. The increase in shrinkage temperature was found to be dependent on the degree of oxidation of alginic acid. The scanning electron microscopy of the DAA tanned leathers had revealed coating of the fiber bundles. The fullness of the DAA tanned leathers was found to be relatively better than the chrome tanned leathers. The physical strength characteristics of the DAA tanned leathers are found to be comparable to that of conventional chrome tanned leathers. En ligne : https://drive.google.com/file/d/1i0mNAKa-bQ7GkY5zDblFMePMYTC1hHk0/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3321 [article]

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Annonying energy. Part II - Solar heating of dark leather / N. de Volder in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 11 (11/2007)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 11 (11/2007) . - p. 362-368 Titre : Annonying energy. Part II - Solar heating of dark leather Type de document : texte imprimé Auteurs : N. de Volder, Auteur ; J. Levy, Auteur ; M. Hallmanns, Auteur Année de publication : 2007 Article en page(s) : p. 362-368 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Automobiles represent a large and important investment, and luxury appointments of which leather is by far the best example bestow upon the car interior a degree of comfort and pride of ownership which translates to a strong selling point. Anything which detracts from the luxury experience creates customer dissatisfaction. Part I of this series outlined the problem of interior noise that originates from the friction of two leather surfaces rubbing against each other and demonstrated that the origin of the noise is energy dissipation manifesting itself as an annoying squeak. A way to test for noise was explained, and a comprehensive leather finish solution was described. This paper examines the issue of solar radiative heating of dark leather surfaces, reviews the applicable physical basis, and makes available a cost-effective solution, in this case a remarkably simple one, to the leather finisher. En ligne : https://drive.google.com/file/d/1N2G8VMaLR-r6KlBzwCVTIPE8kdx14gGm/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3322 [article]

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