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Sample preparation procedures for determination of Cr2O3 in leather samples using ICP-AES and AAS / K. A. Eid in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 7 (07/2004)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 7 (07/2004) . - p. 275-279 Titre : Sample preparation procedures for determination of Cr2O3 in leather samples using ICP-AES and AAS Type de document : texte imprimé Auteurs : K. A. Eid, Auteur ; M. A. Eid, Auteur ; A. El Askar, Auteur ; A. A. Madhy, Auteur ; E. H. Nashy, Auteur Année de publication : 2004 Article en page(s) : p. 275-279 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Three different sample preparation procedures were applied to leather samples, representing four different steps of the tanning process namely, after the tanning step (wet blue), after the retanning step (crust), after normal finishing and after a silicon finishing process. The sample preparation procedures are the conventional procedure in which the samples are fused at 800°C with a mixture of Na2CO3, K2CO3 and borax followed by dissolving in boiling water and filtering. The other two suggested procedures are an ashing/fusion procedure in which the leather sample is ashed at 1000°C followed by an alkali fusion step with NaOH, Na2O2 and Na2CO3 while in the second procedure the leather sample is refluxed with concentrated HNO3. Both procedures lead to complete dissolution of the leather sample. Chromium and consequently Cr2O3 was determined in the prepared sample solutions by using inductively coupled plasma atomic emission spectrometry (ICP-AES) and flame atomic absorption spectrometry (AAS). The obtained results revealed that the direct acid digestion procedure by requiring minimum additive chemicals and no fusion step without leaving any residue represents a convenient procedure for the complete dissolution of leather samples that can be analyzed for Cr using an appropriate analytical technique such as AAS or ICP-AES. The accuracy of the conventional method could be increased by increasing the Na2CO3/ K2CO3/ borax mixture from 4-fold that of the leather sample to 5-fold and, in addition, by raising the ashing temperature from 800°C to 900°C in order to ensure the complete dissolution of the sample. En ligne : https://drive.google.com/file/d/1ntNZ8bNrnADU5p-DwqlbtNIV1K00iqG_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4213 [article]

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Immunochemical estimation of the decorin core-protein content of preparations of bovine decorin / S. M. Mozersky in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 7 (07/2004)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 7 (07/2004) . - p. 280-284 Titre : Immunochemical estimation of the decorin core-protein content of preparations of bovine decorin Type de document : texte imprimé Auteurs : S. M. Mozersky, Auteur ; William N. Marmer, Auteur ; Renée J. Wildermuth, Auteur Année de publication : 2004 Article en page(s) : p. 280-284 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : An indirect sandwich ELISA procedure has been developed for estimation of the decorin core-protein content of preparations of bovine decorin. A mouse anti-bovine decorin antibody is used as the capture antibody, and a rabbit anti-bovine decorin antibody as the detecting antibody. Goat anti-rabbit immunoglobulin G (IgG) labeled with horseradish peroxidase is used to react with the detecting antibody. The peroxidase substrate orthophenylenediamine (OPD), when exposed to the (bound) enzyme in the presence of peroxide, yields a soluble product with an absorbance maximum (in acidic medium) at 492 nm. The absorbance of the solution at this wavelength thus reflects the amount of decorin core-protein in the decorin preparation that is recognized by both the capture antibody and the detecting antibody. En ligne : https://drive.google.com/file/d/1BCbfy6ors4xeZRNi2Y_48JCXhAGVhMqz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4214 [article]

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Studies on the development of pickle-sess vegetable tanning / Subramani Saravanabhavan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 7 (07/2004)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 7 (07/2004) . - p. 285-292 Titre : Studies on the development of pickle-sess vegetable tanning Type de document : texte imprimé Auteurs : Subramani Saravanabhavan, Auteur ; Balachandran Unni Nair, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Palanisamy Thanikaivelan, Auteur Année de publication : 2004 Article en page(s) : p. 285-292 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Pickle-less vegetable tanning is becoming vital to the tanners due to environmental problems. In this investigation an attempt has been made to tan goatskins using commercially available vegetable tanning agent (wattle) at pH 8.0-8.5. In order to have a comparative study, partial pickling to pH 4.5 has also been performed as a control. There is no surface deposition of vegetable tannin in the experimental leathers although vegetable tanning has been carried out at higher pH. This has been substantiated through scanning electron microscopic analysis. The exhaustion of vegetable tannin is higher in the case of the experimental process. The experimentally processed leather shows slight improvement in hydrothermal stability compared to conventionally processed leather. Performance of the leathers is shown to be on par with conventionally tanned leathers through physical and tactile evaluation. Color measurement studies show that the variation in color or shade between control and experimental leather is negligible. The process also enjoys reduction in total solids, chloride and chemical oxygen demand (COD) loads by 73, 97 and 19 %, respectively from the identified streams. En ligne : https://drive.google.com/file/d/1hVT9XCqtiunKsiqPSKQ66GWcOyiu-qMl/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4215 [article]

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Transglutaminases as tanning agents for the leather industry / R. J. Collinghan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 7 (07/2004)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 7 (07/2004) . - p. 293-302 Titre : Transglutaminases as tanning agents for the leather industry Type de document : texte imprimé Auteurs : R. J. Collinghan, Auteur ; X. Li, Auteur ; J. Parry, Auteur ; M. Griffin, Auteur Année de publication : 2004 Article en page(s) : p. 293-302 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : This study was aimed at determining whether the protein crosslinking enzymes, transglutaminases, had the potential to be used as tanning agents, using native bovine hide and purified soluble rat tail collagen as real and model substrates, respectively. We demonstrate that transglutaminases (TGs) were capable of covalently crosslinking collagen molecules together such that on average every collagen molecule contained at least one e(gamma-glutamyl)lysine crosslink. However, transglutaminase-mediated crosslinking did not affect the denaturation temperature of either native bovine hide or soluble rat tail collagens when used in isolation or together with other proteins and bifunctional diamines as crosslinking facilitators. In an initial study into the effect of TG-mediated crosslinking on the tensile strength of chrome-tanned bovine hide, such crosslinking led to a 30 per cent decrease in tensile strength. Despite a change in the gel melting point mediated by e(gamma-glutamyl)lysine crosslinking, the use of transglutaminases as alternative tanning agents seems unlikely given the present data. En ligne : https://drive.google.com/file/d/1EykBXB04m1SaC2YHT_YF5Lgq0AyR85TU/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4216 [article]

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