Optimisation of organic solvent-pH buffer solutions to improve the photochromic performance of plant-derived 3-deoxyanthocyanidin dye / Kumiko Tasaki in COLORATION TECHNOLOGY, Vol. 136, N° 5 (10/2020)  

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 5 (10/2020) . - p. 417-426 Titre : Optimisation of organic solvent-pH buffer solutions to improve the photochromic performance of plant-derived 3-deoxyanthocyanidin dye Type de document : texte imprimé Auteurs : Kumiko Tasaki, Auteur ; Yoshiumi Kohno, Auteur ; Masashi Shibata, Auteur Année de publication : 2020 Article en page(s) : p. 417-426 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : 3-désoxyanthocyanidine Les 3-désoxyanthocyanidines et leurs hétérosides, les 3-désoxyanthocyanines (3-DA) sont une sous-famille des anthocyanidines, partageant le même squelette de base, mais ne possédant pas de groupe hydroxyle sur le carbone. Les 3-désoxyanthocyanidines sont des anthocyanidines jaunes qu'on trouve principalement dans des fougères et des mousses1, dans le sorgho commun et dans le maïs violet (maíz morado). (Wikipedia) Colorants photochromiques Colorants végétaux Décoloration Essais (technologie) Mélanges (chimie) Solvants organiques Sorgho et constituants Index. décimale : 667.2 Colorants et pigments Résumé : Plant‐derived 3‐deoxyanthocyanidins are photochromic materials that are coloured under ultraviolet (UV) irradiation and decoloured under light‐shielded storage. In this study, the optimised solvent composition is investigated to enhance the photochromic performance of luteolinidin, a 3‐deoxyanthocyanidin derivative. The visible absorbance ratio between the solution after UV irradiation and after storage in the dark, an index of photochromic performance, was found to be affected by the pH of the solution, and the value reached a maximum when the pH of the solution was 5.7. The type of organic solvent, which is necessary to dissolve luteolinidin, also affected the photochromic performance. When diethylene glycol or dipropylene glycol was used, the value of the absorbance ratio was especially large. Furthermore, this optimised solvent composition displayed excellent photochromic properties with an extract from the sorghum grain shell containing a large amount of 3‐deoxyanthocyanins. Note de contenu : - EXPERIMENTAL : Materials - Photochromic performance tests - Examination of luteolinidin solution - RESULTS AND DISCUSSION : Solubility of luteolinidin and the possibility of homogeneous mixing with an aqueous pH buffer and organic solvent - Relationship between pH buffer and photochromism of luteolinidin - Relationship between organic solvents and photochromic performance - Analysis of the decolouring process using various organic solvents - Photochromism of sorghum extract solutions with various organic solvents DOI : https://doi.org/10.1111/cote.12484 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12484 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34485 [article]

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