Improvement of light fastness of natural dye : effect of ultraviolet absorbers containing benzotriazolyl moiety on the photofading of red carthamin / Hironori Oda in COLORATION TECHNOLOGY, Vol. 128, N° 2 (2012)  

[article]  inCOLORATION TECHNOLOGY > Vol. 128, N° 2 (2012) . - p. 108-113 Titre : Improvement of light fastness of natural dye : effect of ultraviolet absorbers containing benzotriazolyl moiety on the photofading of red carthamin Type de document : texte imprimé Auteurs : Hironori Oda, Auteur Année de publication : 2012 Article en page(s) : p. 108-113 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbeurs de rayonnement ultraviolet Benzophénones Benzotriazole Pigments végétaux Résistance au rayonnement ultraviolet Rouge carthamine Index. décimale : 667.3 Teinture et impression des tissus Résumé : While the contribution of ultraviolet absorbers to synthetic dyes has been investigated by several workers, there have been few studies pertaining to the use of functional ultraviolet absorbers as a means of improving the light fastness of natural dyes. In this paper, numerous potential ultraviolet absorbers were prepared to prolong the life of natural dye carthamin. The effects of these compounds in reducing photofading were examined on a polymer substrate. The use of commercial ultraviolet absorbers was not necessarily useful in improving the light fastness of the colour. However, benzophenone-type ultraviolet absorbers containing a built-in ultraviolet absorber moiety markedly retarded the photofading rate. It is proposed that 2,2′,4,4′-tetrahydroxy-5-methylbenzotriazolylbenzophenone and its derivatives may be used as effective stabilisers in the fading of natural dyes. Note de contenu : - EXPERIMENTAL : Materials - 5-(2H-benzotriazole-2-yl)2,2', 4,4' - tetrahydroxybenzophenone - Photofading procedure - RESULTS AND DISCUSSION : Properties of UV absorbers - Effect of additives on the photofading of carthamin - Effect of dibenzotriazolyl derivatives on the photofading of carthamin DOI : 10.1111/j.1478-4408.2011.00352.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2011.00352.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14883 [article]

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Improving light fastness of natural dye : photostabilisation of gardenia blue / Hironori Oda in COLORATION TECHNOLOGY, Vol. 128, N° 1 (2012)  

[article]  inCOLORATION TECHNOLOGY > Vol. 128, N° 1 (2012) . - p. 68-73 Titre : Improving light fastness of natural dye : photostabilisation of gardenia blue Type de document : texte imprimé Auteurs : Hironori Oda, Auteur Année de publication : 2012 Article en page(s) : p. 68-73 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bleu de Gardénia Colorants -- Stabilité Colorants végétaux Fibres cellulosiques Photostabilité Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : The photofading behaviour of gardenia blue on cellulose was investigated. A contribution of auto-oxidation and singlet oxygen to that fading was suggested. The inhibiting effect of phenyl ester ultraviolet absorbers towards the photofading of gardenia blue was examined on cellulose. It has been found that the presence of a simple ultraviolet absorber is not of particular value in improving the light fastness of natural dye. The introduction of a singlet oxygen quenching group into an ultraviolet absorber can, however, have an important effect. The nickel complex of 1-benzoyloxynaphthalene-3-sulphonic acid was very effective in reducing the rate of photofading. Note de contenu : - EXPERIMENTAL : Materials - General procedure for photofading of gardenia blue - Assessment of antibacterial activity - RESULTS AND DISCUSSION : effect of various additives on the photofading of gardenia blue - effect of phenyl ester-type UV absorbers on the photostability of gardenia blue - Effect of UV absorbers bearing the nickel sulphonate group on the light fastness of colour - Antibacterial activity of new stabilisers DOI : 10.1111/j.1478-4408.2011.00324.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2011.00324.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13099 [article]

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