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COLORATION TECHNOLOGY / Society of dyers and colourists . Vol. 134, N° 3Mention de date : 06/2018Paru le : 04/06/2018 |
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Ajouter le résultat dans votre panierFood colorants : their past, present and future / Tom Coultate in COLORATION TECHNOLOGY, Vol. 134, N° 3 (06/2018)
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Titre : Food colorants : their past, present and future Type de document : texte imprimé Auteurs : Tom Coultate, Auteur ; Richard S. Blackburn, Auteur Année de publication : 2018 Article en page(s) : p. 165-186 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aliments -- Additifs
ColorantsIndex. décimale : 667.2 Colorants et pigments Résumé : Whether we are purchasing fresh vegetables from a market stall, ready meals from the supermarket, eating at home or in a five‐star restaurant, we use colour to tell us what to expect in terms of taste, nutrition and safety. This review considers the techniques that have, over the years, been employed to modify the colour of our food, and the interactions of these techniques with issues of safety and nutrition. The demand for brightly coloured food resulted in the incorporation of some questionable inorganic and organic chemistry being used in food products. A limited number of synthetic dyes are still used in food today, but health concerns and the consumer‐driven demand for natural colorants has brought about a change in the way food is coloured. The proliferation of products with labels that state they contain “No artificial colours” on supermarket shelves suggests that the future of azo dyes and their various derivatives is strictly limited. Nature produces an abundance of colours and many of these are extracted and used as natural food colorants ; however, they are subject to application limitations and stability problems. Significant research by academia and industry into methods to stabilise and expand the application possibilities for the various approved natural food colorants is ongoing, but most developments that food colour manufacturers proclaim are enhanced vehicles for delivering established natural pigments into food products. Note de contenu : - The past
- The present - Synthetic colorants
- The present - natural food colorants : Green - Yellow and orange - Red and purple - Blue - Brown
- The futureDOI : 10.1111/cote.12334 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12334 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30642
in COLORATION TECHNOLOGY > Vol. 134, N° 3 (06/2018) . - p. 165-186[article]Réservation
Réserver ce documentDevelopments in the chemistry and applications of phthalein dyes. Part 1 : industrial applications / Ram W. Sabnis in COLORATION TECHNOLOGY, Vol. 134, N° 3 (06/2018)
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Titre : Developments in the chemistry and applications of phthalein dyes. Part 1 : industrial applications Type de document : texte imprimé Auteurs : Ram W. Sabnis, Auteur Année de publication : 2018 Article en page(s) : p. 187-205 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Synthèse
PhtaléinesLes phtaléines forment une famille de composés chimiques. Leur structure de base est celle du triphénylméthane et elles possèdent un cycle lactone : R-CO-O-R' entre le carbone central et le carbone en ortho d'un des trois cycles benzéniques.
Beaucoup de phtaléines possèdent la particularité d'être colorées, voire de changer de couleur en fonction du pH. Ces caractéristiques leur permettent d'être utilisées comme colorant ou comme indicateur de pH.
Les deux composés les plus connus de cette famille sont la phénolphtaléine et la thymolphtaléine.Index. décimale : 667.3 Teinture et impression des tissus Résumé : This review describes the huge impact of phthalein dyes on multiple industries. Although phthalein dyes demonstrate several vital applications, there appears to be no review in the literature. Part 1 of this review focuses on developments in the chemistry and industrial applications of phthalein dyes. The industrial applications of phthalein dyes are grouped into building/construction applications, coating applications, electronic/electrical applications and miscellaneous applications. The importance of these dyes in various commercial products is also revealed, and patent analysis is provided in the . The uses of phthalein dyes in various fields are important but their growing popularity with fascinating colour change features is particularly notable. Part 2 of the review will focus on the developments in the chemistry and biological applications of phthalein dyes. Note de contenu : - SYNTHESIS
- INDUSTRIAL APPLICATIONS OF PHTHALEIN DYES : Building/construction applications - Coatings applications - Electronic/electrical applications - Miscellaneous applicationsDOI : 10.1111/cote.12323 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12323 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30643
in COLORATION TECHNOLOGY > Vol. 134, N° 3 (06/2018) . - p. 187-205[article]Réservation
Réserver ce documentInvestigation of alkaline hydrolysis of phthalimide-based azo dye and its application to after-treatment optimisation for high-fasntess dyeing of polyesters in COLORATION TECHNOLOGY, Vol. 134, N° 3 (06/2018)
[article]
Titre : Investigation of alkaline hydrolysis of phthalimide-based azo dye and its application to after-treatment optimisation for high-fasntess dyeing of polyesters Type de document : texte imprimé Année de publication : 2018 Article en page(s) : p. 206-213 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants azoïques
Hydrolyse
PhtalimideLe phtalimide est un imide aromatique, c'est-à-dire un composé organique avec deux groupements carbonyle liés à un atome d'azote trigonal. C'est l'imide de l'acide benzène-1,2-dicarboxylique (acide phtalique).
Propriétés : Le phtalimide est un solide blanc cristallisé à température ambiante. Il est pratiquement insoluble dans l'eau froide, très peu soluble dans le benzène et l'éther de pétrole, et assez soluble dans l'éthanol chaud, l'acide éthanoïque et les bases concentrées.
Obtention : Le phtalimide est obtenu par réaction à chaud de l'anhydride phtalique avec l'ammoniac en solution aqueuse.
Polyesters
Teinture -- Fibres textiles synthétiquesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : 4‐Amino‐N‐methylphthalimide was prepared from phthalimide for use as a diazo component and was coupled with N,N‐Diethylaniline to produce a phthalimide‐derived monoazo disperse dye. The pseudo first‐order kinetics were confirmed by analyzing the dye hydrolysis under alkaline conditions using high performance liquid chromatography, and the optimal dyeing pH and alkali‐clearing conditions were proposed. The synthesised phthalimidyl disperse dyes exhibited excellent colour fastness with a mild alkaline after‐treatment instead of reduction clearing which results in a high biological oxygen demand and pH in conventional disperse dyeing wastewater. Note de contenu : - EXPERIMENTAL : Materials - Instrumental analysis - Synthesis of the dye intermediates - Synthesis of dyes - Formualtion of dye - Alkaline hydrolysis kinetics - Determination of optimal dyeing pH - Dyeing procedure - colour fastness test
- RESULTS AND DISCUSSION : Alkaline hydrolysis kinetics - Determination of optimal dyeing pH - Colour fastness propertiesDOI : 10.1111/cote.12335 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12335 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30644
in COLORATION TECHNOLOGY > Vol. 134, N° 3 (06/2018) . - p. 206-213[article]Réservation
Réserver ce documentThe effect of lighting changes on simultaneous colour contrast : a new aspect of colour rendition / Alessandro Rizzi in COLORATION TECHNOLOGY, Vol. 134, N° 3 (06/2018)
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Titre : The effect of lighting changes on simultaneous colour contrast : a new aspect of colour rendition Type de document : texte imprimé Auteurs : Alessandro Rizzi, Auteur ; Cristian Bonanomi, Auteur ; Laura Blaso, Auteur ; Ornella Li Rosi, Auteur ; Simonetta Fumagalli, Auteur Année de publication : 2018 Article en page(s) : p. 214-221 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie
Eclairage
vision des couleursIndex. décimale : 535.6 Couleur Résumé : Among the many metrics used to compute the colour rendition of a light source which have been investigated in recent years, most consider only the spectral power distribution of the light source being tested. To highlight aspects not usually considered in the development of colour rendition metrics, and to propose future directions for alternative approaches consistent with human visual perception, an experiment was conducted to examine colour appearance variations on certain spatial visual content configurations, in other words the effects of illusions under different light sources. Results indicate that stronger simultaneous contrast configurations have a more unpredictable variation in appearance. Therefore, it is proposed that colour spatial distribution should be considered for the future generation of rendering metrics. Note de contenu : - INTRODUCTION : Measuring colour rendering
- EXPERIMENTAL : Materials - Method - ParticipantsDOI : 10.1111/cote.12336 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12336 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30645
in COLORATION TECHNOLOGY > Vol. 134, N° 3 (06/2018) . - p. 214-221[article]Réservation
Réserver ce documentDry transfer printing of silk and cotton with reactive dyes and mixed polysaccharide thickeners / Qing Li in COLORATION TECHNOLOGY, Vol. 134, N° 3 (06/2018)
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Titre : Dry transfer printing of silk and cotton with reactive dyes and mixed polysaccharide thickeners Type de document : texte imprimé Auteurs : Qing Li, Auteur ; Guoqiang Chen, Auteur ; Tieling Xing, Auteur ; Sainan Miao, Auteur Année de publication : 2018 Article en page(s) : p. 222-229 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants réactifs
CotonLe coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles).
Epaississants
Impression par transfert
Impression sur étoffes
PolysaccharidesLes polysaccharides (parfois appelés glycanes, polyosides, polyholosides ou glucides complexes) sont des polymères constitués de plusieurs oses liés entre eux par des liaisons osidiques.
Les polyosides les plus répandus du règne végétal sont la cellulose et l’amidon, tous deux polymères du glucose.
De nombreux exopolysaccharides (métabolites excrétés par des microbes, champignons, vers (mucus) du ver de terre) jouent un rôle majeur - à échelle moléculaire - dans la formation, qualité et conservation des sols, de l'humus, des agrégats formant les sols et de divers composés "argile-exopolysaccharide" et composites "organo-minéraux"(ex : xanthane, dextrane, le rhamsane, succinoglycanes...).
De nombreux polyosides sont utilisés comme des additifs alimentaires sous forme de fibre (inuline) ou de gomme naturelle.
Ce sont des polymères formés d'un certain nombre d'oses (ou monosaccharides) ayant pour formule générale : -[Cx(H2O)y)]n- (où y est généralement x - 1). On distingue deux catégories de polysaccharides : Les homopolysaccharides (ou homoglycanes) constitués du même monosaccharide : fructanes, glucanes, galactanes, mannanes ; les hétéropolysaccharides (ou hétéroglycanes) formés de différents monosaccharides : hémicelluloses.
Les constituants participant à la construction des polysaccharides peuvent être très divers : hexoses, pentoses, anhydrohexoses, éthers d'oses et esters sulfuriques.
Selon l'architecture de leur chaîne, les polysaccharides peuvent être : linéaires : cellulose ; ramifiés : gomme arabique, amylopectine, dextrane, hémicellulose et mixtes : amidon.
Rhéologie
Soie et constituantsIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Dry transfer technology involving adhesion and steaming was designed for the printing of untreated silk and cotton with reactive dyes. The transfer paper was prepared by coating mixed polysaccharide thickeners composed of adhesive high‐substituted hydroxypropyl cellulose (H‐HPC) and another thickener, either sodium alginate (SA), carboxymethyl cellulose (CMC), hydroxyethyl cellulose (HEC), guar gum (SG‐9) or carboxymethyl starch (SG‐24). Patterns on the transfer paper were obtained by means of ink‐jet. The thermal plasticity of H‐HPC was observed and 120 °C was determined as the adhesion temperature. Rheological testing of all the thickeners verified that their shear‐thinning behaviour favoured successful coating. By comparing the effects of different mixed thickeners on the prints’ quality with regard to colour depth, sharpness, colour fastness and handle, it was concluded that the colour depth depended on the adhesion extent and reactivity between the thickener and reactive dye. Using H‐HPC/SA and H‐HPC/HEC produced the highest and lowest colour depths, respectively. The sharpness was visibly influenced by the different mixed thickeners. A clear pattern was achieved when the other thickener was CMC, SG‐9 or SG‐24. Both the colour fastness and handle were desirable, irrespective of the mixed thickeners used. Note de contenu : - EXPERIMENTAL : Materials - Preparation of the paste - Preparation of the transfer printing paper - Transfer printing - Measurements
- RESULTS AND DISCUSSION : Tentative mechanism for dye transfer and fixation - Thermal plasticity of H-HPC - Rheological property of the paste - Colour depth of the prints - Sharpness of the prints - Colour fastness of the prints - Print handleDOI : 10.1111/cote.12337 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12337 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30646
in COLORATION TECHNOLOGY > Vol. 134, N° 3 (06/2018) . - p. 222-229[article]Réservation
Réserver ce documentA new, highly potent 1,8-naphthalimide-based fluorescence turn-off chemosensor capable of detecting Cu(II) ions in real-world water samples / Chuang Li in COLORATION TECHNOLOGY, Vol. 134, N° 3 (06/2018)
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Titre : A new, highly potent 1,8-naphthalimide-based fluorescence turn-off chemosensor capable of detecting Cu(II) ions in real-world water samples Type de document : texte imprimé Auteurs : Chuang Li, Auteur ; Xintong Han, Auteur ; Shanshan Mao, Auteur ; Stephen Opeyemi Aderinto, Auteur ; Xinkui Shi, Auteur ; Kesheng Shen, Auteur ; Huilu Wu, Auteur Année de publication : 2018 Article en page(s) : p. 230-239 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse quantitative (chimie)
Eaux usées -- Recyclage
Ions cuivre
Produits chimiques -- Détection
Récupération (Déchets, etc.)Index. décimale : 667.3 Teinture et impression des tissus Résumé : The synthesis of a new 1,8-naphthalimide-based fluorescence turn-off chemosensor for the effective detection of Cu(II) ions is reported. The chemosensor MAST was characterised by mp, Fourier Transform-infrared (FTIR), ultraviolet-visible (UV-vis), fluorescence, 1H-NMR and 13C-NMR spectroscopy, and mass spectrometry. After treatment with Cu(II) ions in coexistence with various competitive metal ions in a dimethylsulphoxide (DMSO)/4-2-hydroxyethyl)-1-piperazineethanesulphonic acid (HEPES) buffer solution (v/v, 1:1; pH 7.4), the chemosensor demonstrated high selectivity towards Cu(II) ions and a fluorescence quenching of 83.67% was observed. In addition, a good linear response for the chemosensor detecting Cu(II) ions was obtained over the concentration range 0.2–1 µm. The combined results of UV-vis and fluorescence titrations with the Job plot yielded a 1:1 stoichiometric interaction of the chemosensor with Cu(II) ions. The association constant and detection limit were calculated as 1.37 x 10-6 m-1 and 1.69 x 10-8 m, respectively. Based on results, the quenching response of MAST towards Cu(II) ions could be ascribed to the reverse-photoinduced electron transfer (PET) mechanism. Finally, the proposed chemosensor was applied to quantify Cu(II) ions in real-world water samples and excellent recovery rates of 98–105.8% were obtained. Note de contenu : - EXPERIMENTAL : Reagents and materials - Instrumentation - Procedures for spectroscopic measurements - Procedures for spectroscopic measurements - Synthesis - Synthesis of intermediate compound 2, 3 and 4 - Synthesis of the proposed chemosensor, MAST
- RESULTS AND DISCUSSION : Synthesis and characterisation - Investigation of the photophysical properties of MAST - Investigation of the effect of pH on the sensing properties of MAST - UV-vis and fluorescence titration of MAST towards Cu(II) ions - Spectroscopic assessment of MAST in the presence of various metal ions - Selectivity study of MAST for Cu(II) ions over competitive metal ions - Determination of the soichiometric ratio and binding constant - Determination of the detection limit of MAST - Propsed sensing mechanism - response time - Real-worl application of MAST for Cu(II) quantificationDOI : 10.1111/cote.12340 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12340 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30647
in COLORATION TECHNOLOGY > Vol. 134, N° 3 (06/2018) . - p. 230-239[article]Réservation
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