| Titre : |
pH related swelling |
| Type de document : |
texte imprimé |
| Auteurs : |
Richard Daniels, Auteur ; Walter Landmann, Auteur |
| Année de publication : |
2005 |
| Article en page(s) : |
p. 20 |
| Langues : |
Anglais (eng) |
| Catégories : |
Collagène
Cuirs et peaux
Gonflement (physique)
pH
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
Collagen is amphoteric in nature; that is, it can exhibit both cationic and anionic properties. This is due to the presence of both positively charged amino groups and negatively charged carboxyl groups as side chains on the main polypeptide backbone. At the isoelectric point these charges are balanced, leading to a stable and compact structure.
If the pH is increased, say, by adding sodium hydroxide to skins in a processing float, hydroxyl ions penetrate the structure. The amino groups lose their positive charge, while the carboxyl groups retain their negative charge. |
| Note de contenu : |
- Weakening of the electrostatic bond
- Osmotic effects
- pH related swelling and softness
- Swelling control
- Panel E3/1 : Charge at the IEP
- Panel E3/1 : Charge after introduction of OH-
- Panel E3/1 : Swelling of the skin as a function of pH and repression by addition of salt |
| En ligne : |
https://drive.google.com/file/d/1zU9UtCpsaOBhT__Ddw6Gipg3HTCL2R1U/view?usp=drive [...] |
| Format de la ressource électronique : |
pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32374 |
in WORLD LEATHER > Vol. 18, N° 4 (06-07/2005) . - p. 20
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pH related swelling in WORLD LEATHER, Vol. 18, N° 4 (06-07/2005)
