Physicochemical investigation and spectral properties of sunset yellow dye in cetyltrimethylammonium bromide micellar solution under different pH conditions / Muhammad F. Nazar in COLORATION TECHNOLOGY, Vol. 130, N° 3 (06/2014)  

[article]  inCOLORATION TECHNOLOGY > Vol. 130, N° 3 (06/2014) . - p. 191-199 Titre : Physicochemical investigation and spectral properties of sunset yellow dye in cetyltrimethylammonium bromide micellar solution under different pH conditions Type de document : texte imprimé Auteurs : Muhammad F. Nazar, Auteur ; Shahzad Murtaza, Auteur Année de publication : 2014 Article en page(s) : p. 191-199 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Coefficient de partage (chimie) Colorants Luminescence Micelles Modèles mathématiques pH Solubilisation Surfactants Index. décimale : 667.3 Teinture et impression des tissus Résumé : To mimic binding to biological membranes, the extent of interaction of the efficient food dye Sunset Yellow with a cationic surfactant, cetyltrimethylammonium bromide, was probed by quantifying its absorption and fluorescence emission spectra as a function of premicellar to post-micellar surfactant concentration. The characteristics of the partition behaviour and spectral-luminescent properties of Sunset Yellow–surfactant have been evaluated qualitatively as well as quantitatively for various cetyltrimethylammonium bromide concentrations. With the help of mathematical models, the water–micelle partition coefficient, the Sunset Yellow–cetyltrimethylammonium bromide binding constant, the binding capacity, and the degree of counterion binding were calculated at 25 °C under various pH conditions. The solubilisation of Sunset Yellow is also discussed from the thermodynamics viewpoint by considering the standard free energy change of dye solubilisation and the Sunset Yellow–cetyltrimethylammonium bromide binding energy. The high values of all these interactions indicate that the dye, being organic in nature, is partitioned largely from the aqueous environment to the palisade layer of the micelle. The solubilisation of the dye is enhanced by switching the pH to suppress the self-aggregation of dye molecules. Combined with electrostatic forces, the hydrophobic interactions also play a promising role in the solubilisation of Sunset Yellow in the outer core of the micellar interior. Note de contenu : - EXPERIMENTAL : Reagents - Procedure - UV-vis spectrophotometric measurements - Steady-state fluorescence measurements - RESULTS AND DISCUSSION : Effect of pH on the UV-vis spectrum of sunset yellow - Association of sunset yellow with cetyltrimethylammonium bromide - Degree of counterion binding - Number of dye molecules per micelle - Differential absorbance measurements - Partition constant and free energy changes - Relative solubility - Steady-state fluorescence spectroscopy study - Analysis of binding equilibria DOI : 10.1111/cote.12085 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12085 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21447 [article]

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Spectroscopic study of Alizarin Red S binding with cetyltrimethylammonium bromide at low concentrations / Fatima Gul in COLORATION TECHNOLOGY, Vol. 126, N° 2 (2010)

[article]  inCOLORATION TECHNOLOGY > Vol. 126, N° 2 (2010) . - p. 109-113 Titre : Spectroscopic study of Alizarin Red S binding with cetyltrimethylammonium bromide at low concentrations Type de document : texte imprimé Auteurs : Fatima Gul, Auteur ; Asad M. Khan, Auteur ; Syed S. Sha, Auteur ; Muhammad F. Nazar, Auteur Année de publication : 2010 Article en page(s) : p. 109-113 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.3 Teinture et impression des tissus Résumé : The anthraquinoid dye, Alizarin Red S, forms an anionic moiety in aqueous solution. The complex formation of this dye was studied with the cationic surfactant, cetyltrimethylammonium bromide, in an aqueous environment at low surfactant concentrations. The complex was studied with the help of ultraviolet–visible spectroscopy. A method of continuous variation was applied to confirm the complex formation and showed that a 1:1 complex was evident from the experimental results. The equilibrium constant for the formation of the complex was determined at various temperatures. Different thermodynamic parameters, free energy of binding, enthalpy of binding and entropy of binding were calculated. DOI : 10.1111/j.1478-4408.2010.00236.x Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9284 [article]

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