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Hydrolysis of chrome shavings : application of collagen hydrolysate and "crylic-protein" in post tanning operations / Carlos S. Cantera in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 81, N° 5 (09-10/1997)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 81, N° 5 (09-10/1997) . - p. 183-191 Titre : Hydrolysis of chrome shavings : application of collagen hydrolysate and "crylic-protein" in post tanning operations Type de document : texte imprimé Auteurs : Carlos S. Cantera, Auteur ; M. de Giuste, Auteur ; Alberto Sofia, Auteur Année de publication : 1997 Article en page(s) : p. 183-191 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The tanning industry is a generator of liquid wastes as well as tanned and non-tanned solid wastes plus those derived from the waste water treatment plant. This situation requires the introduction of "cleaner leather technologies" and of treatment systems for both effluents and solids wastes, so that pollutant discharge standards can be reached. Particularly, solid wastes from chrome tanned leather require special attention because of their volume and of the requirements by authorities for their direct disposal in landfill sites. A technological alternative for upgrading these xastes is the detanning of chrome shavings (and wet-blue trimmings) through alkaline hydrolysis assisted by the action of proteolytic enzymes at a moderate temperature (55°C), so as to obtain a collagen hydrolysate and a "chrome cake", both with potential applications in the tanning industry. This paper describes experiments performed inthe application of collagen hydrolysates and of "acrylic-protein" polymers (acrylic acid/ Hydrolysed collagen polymers) in post-tanning processes for the manufacture of bovine leather for "softy" uppers. The retanning capacity of synthesized polymers and the positive effects attained from hydrolysates in the fatliquoring process ("nutrient and cosmetic effects") were assessed by means of a subjective evaluation and through a statistical analysis of the physico-mechanical strengths of the leathers. Results are also shown from a laboratory test with chrome tanned hide powder aimed at assessing the "retanning degree" of these products. The test was developed to allow the comparison of the retanning agents under analysis and to complement the retanning test. En ligne : https://drive.google.com/file/d/15bK0n34z8cwVpX9jMpvXdLo-dZthWjqc/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8008 [article]

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Spectrophotometric determination of chromium in leather using diphenyl carbazide and malachite green / S. Balasubramanian in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 81, N° 5 (09-10/1997)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 81, N° 5 (09-10/1997) . - p. 192-196 Titre : Spectrophotometric determination of chromium in leather using diphenyl carbazide and malachite green Type de document : texte imprimé Auteurs : S. Balasubramanian, Auteur ; S. Padmaja, Auteur Année de publication : 1997 Article en page(s) : p. 192-196 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The spectrophotometric determination of trivalent chromium present in different leather samples was carried out by the oxidation of metal to its hexavalent state and subsequent development of colour with either malachite green or diphenyl carbazide. The concentrations of metal obtained in both methods were compared and the efficacy of the former reagent in the estimation of chromium content in leather is discussed. En ligne : https://drive.google.com/file/d/1jcLmn5a1PSsN0rbibz53_iM1W99HBCmi/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8009 [article]

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Investigation of model tanning/fatliquoring preparations / Anita Przepiórkowska in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 81, N° 5 (09-10/1997)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 81, N° 5 (09-10/1997) . - p. 197-200 Titre : Investigation of model tanning/fatliquoring preparations Type de document : texte imprimé Auteurs : Anita Przepiórkowska, Auteur Année de publication : 1997 Article en page(s) : p. 197-200 Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In earlier works glyceryl tristeatrate (GTS) was used as simple fat in the synthesis of model tanning/fatliquoring preparations. The influence of a non-aqueous solvent, ethylene glycol upon the composition, structure and fastness of the products resulting from interaction of chrome III (Cr III) and fats was studied. The technological feasibility of the products obtained was determined by experimental tanning. The skins tanned with the bifunctional model preparation were properly tanned and lubricated. Their shrinkage temperature was 98°C (371 K) and the total of free and fixed fat amounted to 7.8 %. The skins of high combined fat content (3.2 % after post hydrolysis extraction) were fast to washing in organic solvents. A conclusion drawn from the results together with the chromatographic and spectrophotometric tests is that complex compounds of Cr (III) and GTS were formed in the course of reactions performed in ethylene glycol as a solvent. Further investigations of such complex compounds of Cr(III) and GTS are the topic of the present work. The chrome-fat compound was characterized and described through ion exchange, potentiometric titration and thermogravimetry. The structure of the Cr(III)-GTS complex is important not only from the analytical point of view but also from the technological one because the compound is a model tanning fat-liquoring preparation based on sulphoxylated pig fat. The popular use of such preparations in a tannery could simplify tanning technology by reducing the number of operations and by giving the skins specific properties such as high fastness to washing in organic solvents (i.e. drycleaning). En ligne : https://drive.google.com/file/d/1M2BSUelUCAb9EgUOO_9XgBZDxzQrv3qI/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8010 [article]

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Syntheses and fungicidal evaluation of compounds analogous to 1,3-oxazine / T. Annamalai in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 81, N° 5 (09-10/1997)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 81, N° 5 (09-10/1997) . - p. 201-203 Titre : Syntheses and fungicidal evaluation of compounds analogous to 1,3-oxazine Type de document : texte imprimé Auteurs : T. Annamalai, Auteur ; G. A. Rajkumar, Auteur ; N. Arunasri, Auteur ; S. Rajkumar, Auteur ; P. T. Perumal, Auteur Année de publication : 1997 Article en page(s) : p. 201-203 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Compounds analogous to 1,3-oxazine vis 2H-1,3-benzosazine were prepared by condensation of salicylaldehyde and substituted salcylaldehydes with ammonium acetate and ethanol at 0°C-5°C. The fungicidal effects of these compounds of fungi such as Aspergillus flavus, Aspergillus fumigatus, Candida sp., Penicillium fellutamum and Mucor sp. were studied. En ligne : https://drive.google.com/file/d/15yLM2I3qF70TQsmLJVBQr5SFreSaQxXY/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8011 [article]

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Synthesis and antifungal activity of cypermethric acid derivatives / G. A. Rajkumar in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 81, N° 5 (09-10/1997)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 81, N° 5 (09-10/1997) . - p. 204-206 Titre : Synthesis and antifungal activity of cypermethric acid derivatives Type de document : texte imprimé Auteurs : G. A. Rajkumar, Auteur ; N. Arunasri, Auteur ; T. Annamalai, Auteur ; Mahedeswara Swamy, Auteur ; P. T. Perumal, Auteur Année de publication : 1997 Article en page(s) : p. 204-206 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Ester and amide derivatives of cypermethric acid which belongs to the class of pyretheriods, were prepared and the effects of these compounds were studied on certain pathogenic fungus such as Aspergillus flavus, Aspergillus niger, Aspergillus terreus and a mixed fungal spore containing strains of the above three fungus plus penicillium notatum and penicillium purpurogenum. En ligne : https://drive.google.com/file/d/10O_Me5W4SjfS8_P3LfglttDSEwgqgIRx/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8012 [article]

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