| Titre : |
Mechanism of photoprotection of wool with formaldehyde and thiol derivatives |
| Type de document : |
texte imprimé |
| Auteurs : |
Keith R. Millington, Auteur ; George Maurdev, Auteur ; Michael J. Jones, Auteur |
| Année de publication : |
2009 |
| Article en page(s) : |
p. 117-122 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Index. décimale : |
667.3 Teinture et impression des tissus |
| Résumé : |
The application of thiourea and formaldehyde offers significant reductions in photoyellowing for natural, bleached and fluorescent-brightened wools. We have examined the use of alternative thiol derivates to thiourea and shown that a mixture of N-acetylcysteine and formaldehyde is similarly effective. Photo-induced chemiluminescence studies on treated wool fabrics show that the intensity of chemiluminescence following a brief exposure to ultraviolet A radiation is reduced for wool treated with thiourea and formaldehyde, N-acetylcysteine–formaldehyde and thiourea dioxide–formaldehyde, but not for formaldehyde alone. This demonstrates that a lower population of free radicals is formed in irradiated thiol-derivative formaldehyde-treated wools because of free radical scavenging by the sulphur-containing species. This free radical scavenging results in reduced photoyellowing. The effect of thiourea and formaldehyde treatment on the intrinsic fluorescence of wool is significantly different to N-acetylcysteine–formaldehyde. Thiourea and formaldehyde quenches tryptophan fluorescence relative to untreated wool, whereas N-acetylcysteine–formaldehyde treatment results in an increase in intensity probably because of a reduction in disulphide quenching. |
| DOI : |
10.1111/j.1478-4408.2009.00183.x |
| En ligne : |
http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2009.00183.x/pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4857 |
in COLORATION TECHNOLOGY > Vol. 125, N° 2 (2009) . - p. 117-122
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