Tanning with natural polymeric materials. Part 1 : Ecofriendly tanning using dialdehyde sodium alginate / Swarna Vinodh Kanth in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 6 (11-12/2007)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 91, N° 6 (11-12/2007) . - p. 252-259 Titre : Tanning with natural polymeric materials. Part 1 : Ecofriendly tanning using dialdehyde sodium alginate Type de document : texte imprimé Auteurs : Swarna Vinodh Kanth, Auteur ; Balaraman Madhan, Auteur ; M. J. Philo, Auteur ; S. Mithuna, Auteur ; J. R. Rao, Auteur ; B. U. Nair, Auteur Année de publication : 2007 Article en page(s) : p. 252-259 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage Alginate de sodium dialdéhyde Caractérisation Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux de chèvres Oxydation Réticulation (polymérisation) Tannage synthétique Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The characteristics of DSA as a tanning agent have been investigated using DSA prepared by selective periodate oxidation of the natural polymer sodium alginate (SA). Shrinkage temperature and enzyme stability of leathers at varied DSA concentrations, pH, and time were examined, treatment of goatskins gave a maximum shrinkage temperature of 80°C at pH8. The formation of the crosslinks between DSA and the collagen of goatskins gav significant stability to leathers against enzymatic degradation (collagenase). The degree of crosslinking was studied using trinitrobenzene sulphonic acid (TNBS). The degree of crosslinking was found to increase with the increase in degree of oxidation of SA and the concentration of DSA. In this investigation, the properties of DSA tanned leathers are discussed and the tannage optimized. The DSA leathers were compared with chrome-tanned leathers for handle. Note de contenu : - EXPERIMENTAL PROCEDURES : Reagents - Periodate oxidation of sodium alginate - Determination of degree of oxidation - Determination of dialdehyde content - Solubility of DSA - Determination of pH - TANNING TRIALS USING DSA - EFFECT OF VARIOUS PARAMETERS : Influence of fatliquor - Comparison of DSA leathers with control leathers - Estimation of aldehyde fixed to collagen - Collagenase hydrolysis of the dialdehyde sodium alginate tanned leather - Measurement of degree of crosslinking - Organoleptic properties of tanned leathers - RESULTS AND DISCUSSION : Characterization of tanning agent - Tanning Trials - Collagenase hydrolysis of DSA tanned leathers - Degree of crosslinking - Handle - Table 1 : Tanning process using DSA from pickled goat skins - Table 2 : Tanning process for control leathers - Table 3 : Post tanning process for leathers tanned with DSA at different oxidation and BCS - Table 4 : Periodate oxidation of DSA - Table 5 : Shrinkage temperature, DSA fixation and collagen degradation of delimed pelt and DSA tanned leathers at varying conditions - Table 6 : Degree of crosslinking of collagen treated with DSA of different oxidation levels/concentrations and pH results for 92% oxidized DSA En ligne : https://drive.google.com/file/d/1PV7wgVS9JaIyGDMxGkxr3rU2tGiZMsGL/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39008 [article]

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