[article]
| Titre : |
Collagen and polyphenols : new relationships and new outcomes. Part 2. Phenolic reactions for simultaneous tanning and coloring |
| Type de document : |
texte imprimé |
| Auteurs : |
Anthony D. Covington, Auteur ; Ono Suparno, Auteur ; T. H. Lilley, Auteur ; C. S. Evans, Auteur |
| Année de publication : |
2005 |
| Article en page(s) : |
p. 336-343 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
Polyphenols are the basic building blocks of natural skin and hair pigments: they can be polymerised to create versions of natural black, brown and orange melanins. These reactions can be catalysed by laccase: not only dothey create colour, but also, if they are conducted in the presence of collagen, the resulting pigment is bound to the leather in a covalent tanning manner. Therefore, the leather becomes coloured by a lightfast pigment, which is firmly fixed. It has not proved possible to create a pure black, but earth shades from green to brown/black are easily produced. It appears to be a feature of this type of stabilising mechanism for collagen, the creation of a polyphenol matrix around the triple helix, that it has the added benefit of actually strengthening the leather. Since every traditional process step effectively weakens collagen, especially tanning, this is the first chemical reaction that has been shown to reverse that effect. |
| En ligne : |
https://drive.google.com/file/d/1Sex4BZgd7gbc5qBoke0HQi9MOb0bDntG/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4055 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. C, N° 9 (09/2005) . - p. 336-343
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Collagen and polyphenols : new relationships and new outcomes. Part 2. Phenolic reactions for simultaneous tanning and coloring in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 9 (09/2005)
