| Titre : |
Naphthoquinone colorants from Arnebia nobilis Rech.f |
| Type de document : |
texte imprimé |
| Auteurs : |
Anjali Arora, Auteur ; Deepti Gupta, Auteur ; Deepali Rastogi, Auteur ; Mohan Gulrajani, Auteur |
| Année de publication : |
2012 |
| Article en page(s) : |
p. 350-355 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Analyse spectrale
Chromatographie
Colorants végétaux
Extraction (chimie)
Naphtoquinone
Teinture -- Fibres textiles
|
| Index. décimale : |
667.3 Teinture et impression des tissus |
| Résumé : |
The roots of Arnebia nobilis have traditionally been used as a colorant in food and cosmetic preparations. The deep red colour obtained is attributed to the presence of shikonin and its isomer alkannin and their derivatives. In this study, five colouring components were extracted from the roots of A. nobilis. These were separated and purified chromatographically and characterised using various spectrophotometric techniques. Three of the five components were identified. The major component was found to be alkannin ?, ?-dimethylacrylate [5,8-dihydroxy-2-(1?-?, ?-dimethylacryloxy-4?-methylpent-3?-enyl)-1,4-naphthoquinone], accounting for nearly 25% of the total colouring matter. Alkannin acetate [2-(1?-acetoxy-4?-methylpent-3?-enyl)-5,8-dihydroxy-1,4-naphthoquinone] made up ca. 8% and shikonin [(5,8-dihydroxy-4?-methylpent-3?-enyl)-1,4-naphthoquinone] contributed ca. 6% of the colouring matter. Polyester was dyed pink, nylon was dyed blue and all other substrates acquired a purple hue under similar dyeing conditions. The dyed fabrics showed excellent wash, rub and perspiration fastness; however, light fastness was found to be poor. |
| Note de contenu : |
- EXPERIMENTAL - Materials - Methods : extraction of colorants - Chromatographic separation of colorants - Fabric preparation - Dyeing studies - Determination of depth of shade - Fastness tests
- RESULTS AND DISCUSSION - Chromatographic analysis (TLC and column chromatography - Optimisation of detection wavelength for HPLC - HPLC analysis) - Spectroscopic analysis - Dyeing studies (colour fastness properties) |
| DOI : |
10.1111/j.1478-4408.2012.00383.x |
| En ligne : |
http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2012.00383.x/pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15802 |
in COLORATION TECHNOLOGY > Vol. 128, N° 5 (2012) . - p. 350-355
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Naphthoquinone colorants from Arnebia nobilis Rech.f in COLORATION TECHNOLOGY, Vol. 128, N° 5 (2012)
