| Titre : |
Comparative sorption isotherms for colorants present in Dyers’ madder (Rubia tinctorum L.) provide new insights into historical dyeing |
| Type de document : |
texte imprimé |
| Auteurs : |
Lauren Ford, Auteur ; Christopher M. Rayner, Auteur ; Richard S. Blackburn, Auteur |
| Année de publication : |
2018 |
| Article en page(s) : |
p. 3-12 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Absorption
Adsorption
Colorants -- Analyse
Colorants végétaux
Garance et constituants
Laine
Teinture -- Fibres textiles
|
| Index. décimale : |
667.3 Teinture et impression des tissus |
| Résumé : |
Dyers madder (Rubia tinctorum L.) has been famously used throughout history as a source of red dye. The sorption onto mordanted wool of the major colorant components of R. tinctorum, alizarin and the glycosides ruberythric acid and lucidin primeveroside, is studied herein. Sorption of a purified 1:1 mixture of ruberythric acid:lucidin primeveroside most closely followed a Temkin isotherm (R2 0.925), whereas alizarin followed a Freundlich isotherm (R2 0.940). These results were compared with HPLC chromatograms of English, Turkish and Iranian varieties of R. tinctorum before and after dyeing, where it was observed that the glycosides are shown to have the highest uptake onto wool. The higher sorption energy of the purified 1:1 ruberythric acid:lucidin primeveroside mixture (–11.4 kJ mol−1) compared with alizarin (–5.8 kJ mol−1) is in agreement with the HPLC results, indicating that the ruberythric acid/lucidin primeveroside mixture has a substantially higher affinity for wool compared with alizarin. Not only do the glycosides show higher affinity for the wool, but greater interactions between adsorbed species suggest a more extensive aggregation of dye on the surface of the wool. These observations are in contrast with much of the literature and bring into question previous conclusions that alizarin was the main dyeing species throughout history. |
| Note de contenu : |
- THEORY : Langmuir isotherm - Freundlich isotherm - Temkin isotherm - Adsorption energy
- MATERIALS AND METHODS : Materials - Purification of 'ruberythric acid' by solid-phase extraction (SPE) - Dyeing process - Sorption isotherms - UV/visible spectrophotometry - High performance liquid chromatography with photodiode array detection (HPLC-DAD)
- RESULTS AND DISCUSSION : HPLC dyeing studies of Iranian, Turkish and English madder - Sorption isotherms of the purified 1:1 ruberythric acid : lucidin primeveroside mixture and alizarin |
| DOI : |
10.1111/cote.12327 |
| En ligne : |
https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12327 |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30122 |
in COLORATION TECHNOLOGY > Vol. 134, N° 1 (02/2018) . - p. 3-12
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