Liposomes in leather dyeing. Stability of dye-liposome systems and applications / A. de La Maza in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVII, N° 12 (12/1992)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXVII, N° 12 (12/1992) . - p. 459-465 Titre : Liposomes in leather dyeing. Stability of dye-liposome systems and applications Type de document : texte imprimé Auteurs : A. de La Maza, Auteur ; Agusti Marsal, Auteur ; J. Cot, Auteur ; Albert M. Manich, Auteur ; J. L. Parra, Auteur Année de publication : 1992 Article en page(s) : p. 459-465 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The influence of the liposome suspensions (multilamellar vesicles, MLV) as carrier of dye on the dyeing of tanned leather with acid dyes has been studied. For this purpose, liposomes made with egg phosphatidylcholine and containing the acid dye Verde Luce (C.I. Acid Green 5), triarylmethane derivative, have been investigated. The investigations of the physicochemical stability of liposomes have been undertaken through the measurements of mean particle size distribution of phospholipidic vesicles after preparation and possible hydrolysis of phospholipid molecules, studying the alteration of fatty acids that built of the liposomic structures. The kinetic aspects of dye exhaustion on tanned leathers at different phospholipid concentration have been investigated also. The use of liposomes in dyeing process inhibit slightly dye exhaustion improving the smoothness of the treated leather. Both effects were directly dependent of phospholipid concentration in liposomes. En ligne : https://drive.google.com/file/d/1qAoKYAA5AMS3wV0y22JsRFow5wmZbkAM/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8254 [article]

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Liposomes of phosphatidylcholine : a biological natural surfactant as a dispersing agent / M. Marti in COLORATION TECHNOLOGY, Vol. 123, N° 4 (2007)  

[article]  inCOLORATION TECHNOLOGY > Vol. 123, N° 4 (2007) . - p. 237-241 Titre : Liposomes of phosphatidylcholine : a biological natural surfactant as a dispersing agent Type de document : texte imprimé Auteurs : M. Marti, Auteur ; L. Coderch, Auteur ; A. de La Maza, Auteur ; J. L. Parra, Auteur Année de publication : 2007 Article en page(s) : p. 237-241 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.3 Teinture et impression des tissus Résumé : Disperse dyes are very hydrophobic molecules that in their commercial form are usually milled in the presence of large amounts of dispersing agents (synthetic surfactants). Other dispersing agents are added as auxiliaries during the dyeing process. These synthetic surfactants were substituted for liposomes prepared with phosphatidylcholine, a well-known biological surfactant of natural origin which is environmentally friendly, and liposomes were studied as a dispersing agent in polyester dyeing. The physicochemical behaviour of dye dispersion was analysed by two experimental measurements: the aggregation process of dye particles by filtration of dispersion and the determination of the turbidity ratio. The results obtained show the usefulness of liposomes as a dispersing auxiliary in a dyeing process, avoiding aggregation of dye molecules at high temperatures. Moreover, polyester dyeing shows similar final exhaustions, approximately 90%, at different kinetics, when liposomes are used. DOI : 10.1111/j.1478-4408.2007.00089.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2007.00089.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3524 [article]

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Phospholipid bilayers as vehicles of an anthraquinone disperse dye in leather dyeing / A. de La Maza in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIX, N° 5 (05/1994)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXIX, N° 5 (05/1994) . - p. 123-131 Titre : Phospholipid bilayers as vehicles of an anthraquinone disperse dye in leather dyeing Type de document : texte imprimé Auteurs : A. de La Maza, Auteur ; J. L. Parra, Auteur ; J. Cot, Auteur ; Agusti Marsal, Auteur Année de publication : 1994 Article en page(s) : p. 123-131 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Studies are described on the use multilamellar lipid vesicles (MLV) as carriers of disperse dyes in the dyeing of tanned leather. We investigated liposomes made up of egg phosphatidylcholine containing the anthraquinonic disperse dye Oracetblau2R, (C.I. Disperse Violet 1) at different phospho-lipid/dye concentrations. The physical stability of these systems was assessed by measuring the mean vesicle size distribution of lipid vesicle suspensions after preparation and during the dyeing process. Kinetic aspects involving dye absorption on tanned leather by means of MLV liposomes at different dye/lipid ratios were also investigated. This process leads to controlled dye exhaustion on leather, directly dependent on the relationship between the dye and lipid components, with a clear improvement in the dispersing efficiency of these systems as compared with the use of conventional dispersing agents for this dye. The optimum dye exhaustion was obtained for the dye/phospholipid concentrations 0.53 mM respectively with an improved dye distribution on the leather surface. These relative compositions corresponded to the weight ratios of both components at which these systems reached the maximum encapsulation efficiency. En ligne : https://drive.google.com/file/d/17uhRHIOM3Lyqdesk7zRpDQ-wBYuf13Bh/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8073 [article]

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