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Detection of carcinogenic amines in azo dyes / F. Planelles in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 82, N° 2 (03-04/1998)

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 82, N° 2 (03-04/1998) . - p. 45-52 Titre : Detection of carcinogenic amines in azo dyes Type de document : texte imprimé Auteurs : F. Planelles, Auteur ; E. Verdù, Auteur ; D. Campello, Auteur ; N. Grane, Auteur ; J. M. Santiago, Auteur Année de publication : 1998 Article en page(s) : p. 45-52 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The proclamation of 15 july 1994 of the German law concerning consumer goods, which prohibits dyes that, after the processes of reductive cleavage give certain amines, has necesitated the developed of a methodology of analysis or arylamines, the influence of the conditions of the reducing agent/dye ratio, the pH of the medium, the reaction time and the temperature in the reduction process (sodium dithionite) of hte azo dyes Direct Red 28, Acid Red 114 and Direct Blue 35 have been studied. It has been proved that the most suitable conditions for work can vary quite significantly from one dye to antoher, but if we use those conditions which are most extreme, we are assured in any case of the greatest possible yields of arylamines. Finally, it is reported that the maximum experimental concentration of arylamine obtained in each dye approximates quite well to the theoretical estimated values, which indicates thate the yield of reductive cleavage of the azo group using sodium dithionite as a reducing agent is practically 100 %. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7863 [article]

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Ion-exchange properties of leather in wet processing / D. M. Turtoi in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 82, N° 2 (03-04/1998)

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 82, N° 2 (03-04/1998) . - p. 53-55 Titre : Ion-exchange properties of leather in wet processing Type de document : texte imprimé Auteurs : D. M. Turtoi, Auteur ; N. P. Slemcu, Auteur ; E. I. Tudorache, Auteur ; M. S. Belcu, Auteur Année de publication : 1998 Article en page(s) : p. 53-55 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : During hide wet processing, partial hydrolysis of polypeptide bonds generates free carboxylic and amino groups. Experiments in both static and dynamic conditions point out the appearance of significant ion-exchange properties. A method for leather ion-exchange capacity measurement is presented. The values obtaines about 2.0 mval/(g.dry substance) for cation exchange and 0.62 mval/g.dry substance) for anion exchange compare well with the ones for other natural and synthetic ion exchangers. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7864 [article]

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Enzyme hydrolysis of solid tannery wastes : solid state enzyme production / R. Chakraborty in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 82, N° 2 (03-04/1998)

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 82, N° 2 (03-04/1998) . - p. 56-58 Titre : Enzyme hydrolysis of solid tannery wastes : solid state enzyme production Type de document : texte imprimé Auteurs : R. Chakraborty, Auteur ; S. Sarkar, Auteur Année de publication : 1998 Article en page(s) : p. 56-58 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A heat stable alkaline protease was found to be produced by Paecilomuces lilacinus. The enzyme was produced by solid state fermentation. Solid wastes such as lime fleshings and chrome shavings were used as the substrate for hydrolysis. Both wastes were efficiently solubilised. The effectiveness of the hydrolysis was determined by Kjeldahl nitrogen analysis. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7865 [article]

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Influence of finishing formulations on static charge dissipation of leather / Agusti Marsal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 82, N° 2 (03-04/1998)

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 82, N° 2 (03-04/1998) . - p. 59-63 Titre : Influence of finishing formulations on static charge dissipation of leather Type de document : texte imprimé Auteurs : Agusti Marsal, Auteur ; L. Labastida, Auteur ; Albert M. Manich, Auteur ; M. D. de Castellar, Auteur ; R. Sauri, Auteur ; J. Cot, Auteur Année de publication : 1998 Article en page(s) : p. 59-63 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7866 [article]

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High stability organic tanning using plant polyphenols. Part 1 / Anthony D. Covington in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 82, N° 2 (03-04/1998)

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 82, N° 2 (03-04/1998) . - p. 64-71 Titre : High stability organic tanning using plant polyphenols. Part 1 : The interactions between vegetable tannins and aldehydic crosslinkers Type de document : texte imprimé Auteurs : Anthony D. Covington, Auteur ; Bi Shi, Auteur Année de publication : 1998 Article en page(s) : p. 64-71 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This new tannage is based on natural products, the plant polyphenols or vegetable tannins. The chemistry applies only to the condensed or catechol tannins, because it involves crosslinking the flavonoid ring system. The preferred vegetable tannin is mimosa, in which the presence of pyrogallol groups appears to aid the reaction. The preferred crosslinker is oxazolidine. High shrinkage temperature is achieved by heating to 60° to drive the reaction ; note, the pH requirements for fixing the two components of the tannage are mutually exclusive. Shrinkage temperatures > 110° are easily achieved. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7867 [article]

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Niche products, training, rapid response, sorting techniques, plant layout and efficiencies / J. Lezin in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 82, N° 2 (03-04/1998)

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 82, N° 2 (03-04/1998) . - p. 72-74 Titre : Niche products, training, rapid response, sorting techniques, plant layout and efficiencies Type de document : texte imprimé Auteurs : J. Lezin, Auteur Année de publication : 1998 Article en page(s) : p. 72-74 Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7868 [article]

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The challenge of manufacturing leather dyes today / C. T. Page in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 82, N° 2 (03-04/1998)

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 82, N° 2 (03-04/1998) . - p. 75-77 Titre : The challenge of manufacturing leather dyes today Type de document : texte imprimé Auteurs : C. T. Page, Auteur ; Jens Fennen, Auteur Année de publication : 1998 Article en page(s) : p. 75-77 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The introduction in July 1994 bye the German parliament of an amendment to their Consumer Goods Act, which prohibited certain azo dyes, has had consequences world-wide at all levels of the leather industry. The general thrust behind the law has strong support at all levels in the industry but the fine details have caught many unaware of their practical implications. Ther German law makers have found they needed several further amendments to bring even some degree of workability to the legislation. The test institutes world-wide have discoveres an exceedingly lucrative new business niche in chemical analysies. Those in the leather manufacturing chain, from tanners all over the world through to the German retail shops, have had to subject their products to analytical scrutiny at the parts per million level have discovered the limits of analytical methods. The German Act probihits the use of certain azo dyes in defined consumer goods that come into repeated contact with the skin. The azo dyes affected by this legislation are those that after splitting up of the dye molecule at eht azo groups release any of the 20 amines listed in the Act. Those involved in developing the analytical method quickly discovered it is easy to legally define this splitting up of dye molecules, but in practice much more difficult to implement so that only amines from the splitting of the azo group were detected. Dye molecules are happy to split in other ways if the reaction conditions are sufficient. Any type of correlation with the real life in vivo reduction reactions was never considered as the analysts struggled within strict time constraints to produce a German standard test method. The manufacture of a dye today, taking into account all the constraints of the above legislation, can lead to "clean" dyes being labelled as doubtful. The manufacturing process of a dye will be followed to show how such a situation could arise. It is clear that there are still areas of greynes in the Act as it stands, but the rapid expansion of this type of legislation within Europe means that all in the leather industry will have to work with the current political, commercial and analytical compromise situation. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7869 [article]

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An investigation of titanium (III) as a tanning agent / Anthony D. Covington in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 82, N° 2 (03-04/1998)

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 82, N° 2 (03-04/1998) . - p. 78-80 Titre : An investigation of titanium (III) as a tanning agent Type de document : texte imprimé Auteurs : Anthony D. Covington, Auteur ; Graham Lampard, Auteur ; M. Pennigton, Auteur Année de publication : 1998 Article en page(s) : p. 78-80 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A review of the periodic table demonstrates that while many elements may be capable of tanning, only a few useful options exist. One of these is titanium ; the usual compounds for tanning agents are based on the stable (IV) oxidation state or, more empirically, the TiO2+ ion. However, there is also Ti(III) which can exist as the hexaaquotitanium (iii) ion, [Ti(HéO)6]3+, a metastable oxidation state with the potential for tanning. A literature search has revealed a dearth of information about the complex chemistry of titanium (III). However, there are magnetic resonance spectroscopy techniques available to investigate complex formation. The reaction between Ti(III) and vegetable tannin has been investigated and a method to determine the titanium content of leathers developed. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7870 [article]

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