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Optimization of hydrolysis of chrome shavings by enzyme from P. lilacinus / Ratna Chakraborty in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 3 (03/2004)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 3 (03/2004) . - p. 103-109 Titre : Optimization of hydrolysis of chrome shavings by enzyme from P. lilacinus Type de document : texte imprimé Auteurs : Ratna Chakraborty, Auteur Année de publication : 2004 Article en page(s) : p. 103-109 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Production of an alkaline protease by Paecilomyces lilacinus M5 through solid-state fermentation was standardized and its thermal and pH profiles were studied. The enzyme was found to be thermostable and alkali stable. This enzyme was used for the hydrolysis of chrome shavings. Pretreatment study was done on chrome shavings prior to enzymatic hydrolysis. An efficient removal of chrome and protein hydrolysate from chrome shavings was observed. En ligne : https://drive.google.com/file/d/1pR37kKlaudeffNYF7hJvu10kwWiQ0LAv/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4184 [article]

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Mixed metal complexes of zirconium : A step towards reducing usage of chromium in tanning / Kalarical Janardhanan Sreeram in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 3 (03/2004)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 3 (03/2004) . - p. 110-118 Titre : Mixed metal complexes of zirconium : A step towards reducing usage of chromium in tanning Type de document : texte imprimé Auteurs : Kalarical Janardhanan Sreeram, Auteur ; Rathinam Aravindhan, Auteur ; Balachandran Unni Nair, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2004 Article en page(s) : p. 110-118 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The use of chromium(III) salts in tanning is likely to continue. The currently employed tanning methods lead to considerable waste of chromium(III) salts used. There is a need to develop mixed-metal complexes of chromium to reduce the use of chromium in tanning and avoid recovery-reuse methodologies required in conventional chrome tanning. A mixed-metal complex of chromium and zirconium has been developed. The mole ratios of zirconium and chromium in the complex have been optimized to achieve above 100 °C shrinkage temperature, without loss. of leather quality and changes to conventional tanning methods. The developed leathers meet various physical and chemicals characteristics required and also enable reduction in chromium loads in the effluent by 75 % and sulfates load by 50 En ligne : https://drive.google.com/file/d/168hPE-c-idGYzI7LKlUv-aADpl9DupR9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4185 [article]

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How much Cr(VI) is formed during extraction of leather with phospahte buffer ? / Dipankar Chaudhuri in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 3 (03/2004)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 3 (03/2004) . - p. 119-128 Titre : How much Cr(VI) is formed during extraction of leather with phospahte buffer ? Type de document : texte imprimé Auteurs : Dipankar Chaudhuri, Auteur ; Ratna Chakraborti, Auteur ; Pinaki Bhattacharya, Auteur Année de publication : 2004 Article en page(s) : p. 119-128 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Hexavalent chromium is not used at any stage of leather processing and leather possesses a reducing property. Therefore, hexavalent chromium is not likely to be present in leather. Nevertheless, Cr(VI) has been reported to be present. At the moment it is not clear whether the positive test results are indeed the consequence of hexavalent chromium extraction from leather or not. Despite this, Cr(VI) formation during extraction has been suggested as a probable reason for most of the positive test results. In the present investigation, leather analyses were carried out using different buffer solutions and also the same buffer solution at different pH values. Analysis for Cr(VI) was carried out under simulated extraction conditions also. The results of all these experiments indicate that the amount of Cr(VI) formed during extraction is too little to be considered as an important reason behind testing that yields positive findings of Cr(VI). En ligne : https://drive.google.com/file/d/1DJ0JaI4niISgvsrnE-Mn2FecHlJVf7P2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4186 [article]

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Molecular weight distribution and functional properties of enzymatically modified commercial and experimental gelatins / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 3 (03/2004)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 3 (03/2004) . - p. 129-141 Titre : Molecular weight distribution and functional properties of enzymatically modified commercial and experimental gelatins Type de document : texte imprimé Auteurs : Maryann M. Taylor, Auteur ; Eleanor M. Brown, Auteur ; William N. Marmer, Auteur Année de publication : 2004 Article en page(s) : p. 129-141 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Prior research from this laboratory has demonstrated that commercial gelatins can be modified with a microbial transglutaminase with a resulting effect on their physical properties. The gels isolated from those treatmentshad improved physical properties and films prepared from these modified products had superior mechanical properties. In this present study we modified commercial gelatins and experimental gelatin products isolated from chromium-containing tannery waste and examined the functional properties as well as their molecular weight distributions. On increasing the enzyme concentration, the gelatins become highly polymerized, some to such high molecular weight that the moieties will either not go into the SDS-PAGE gel or, because of their insolubility, cannot even be applied to the gel. Physical, foaming, adhesive and water absorption properties of enzymatically-modified gelatins were improved. The extent of modification of the resulting products was demonstrated by the molecular weight distribution studies and these correlated with changes in physical and functional properties. A particular advantage to using this enzymatic modification was the improvement in physical properties imparted to low quality gelatins. The modified protein has applications in a wide range of products, including adhesives, cosmetics, films, encapsulating agents, fertilizers, and--of significance to the leather industry--as coatings or fillers. En ligne : https://drive.google.com/file/d/1Ps5menD0AxS1k2U5xRLRMmvlbuSJJjQs/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4187 [article]

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