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A review of developments in industrial hair colorant actives for oxidative dyes / Andrew D. Towns in COLORATION TECHNOLOGY, Vol. 137, N° 4 (12/07/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 4 (12/07/2021) . - p. 301-335 Titre : A review of developments in industrial hair colorant actives for oxidative dyes Type de document : texte imprimé Auteurs : Andrew D. Towns, Auteur Année de publication : 2021 Article en page(s) : p. 301-335 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cheveux -- Teinture Colorants Cosmétiques Ingrédients cosmétiques Oxydants Index. décimale : 668.5 Parfums et cosmétiques Résumé : This paper reviews developments in industrial colorants as active ingredients of commercial products that rely on oxidative chemistry for the coloration of human hair. After outlining the regulatory challenges faced by the industry, which are shaping the landscape of colorant usage, the most commercially important actives utilised in oxidative hair colorant formulations are surveyed from the perspective of their chemistry and economics. Some developments in the form of recently introduced actives are also described. Note de contenu : This paper reviews developments in industrial colorants as active ingredients of commercial products that rely on oxidative chemistry for the coloration of human hair. After outlining the regulatory challenges faced by the industry, which are shaping the landscape of colorant usage, the most commercially important actives utilised in oxidative hair colorant formulations are surveyed from the perspective of their chemistry and economics. Some developments in the form of recently introduced actives are also described. DOI : https://doi.org/10.1111/cote.12545 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12545 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36097 [article]

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New disazo dyes derived from aminopyrazoles : synthesis, spectroscopic properties, computational study and structural properties / Fati Yildirim in COLORATION TECHNOLOGY, Vol. 137, N° 4 (12/07/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 4 (12/07/2021) . - p. 336-347 Titre : New disazo dyes derived from aminopyrazoles : synthesis, spectroscopic properties, computational study and structural properties Type de document : texte imprimé Auteurs : Fati Yildirim, Auteur ; Aykut Demirçali, Auteur ; Pinar Tunay Tasli, Auteur ; Fikret Karci, Auteur Année de publication : 2021 Article en page(s) : p. 336-347 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acides et bases, Théories des Aminopyrazoles Colorants -- Synthèse Colorants azoïques Fonctionnelles densité La théorie de la fonctionnelle de la densité (pour Density Functional Theory, sous-entendu électronique : DFT) constitue au début du XXIe siècle l'une des méthodes les plus utilisées dans les calculs quantiques de la structure électronique de la matière (atomes, molécules, solides) aussi bien en physique de la matière condensée qu'en chimie quantique. La DFT trouve ses origines dans le modèle développé par Llewellyn Thomas et Enrico Fermi à la fin des années 1920. Fourier, Spectroscopie infrarouge à transformée de Rayonnement infrarouge -- Absorption Rayonnement ultraviolet -- Absorption Spectroscopie d'absorption Tautomérie Index. décimale : 667.2 Colorants et pigments Résumé : In this study, five new pyrazolyazo pyrazole dyestuff syntheses are reported. For this purpose, 5-amino-4-arylazo-3-methyl-1H-pyrazoles were diazotised and coupled with 3-amino-5-hydroxy-1H-pyrazole. Fourier Transform–infrared, ultraviolet-visible and proton nuclear magnetic resonance spectroscopy were used to investigate the properties of aminopyrazole-based dyes obtained in this study. The maximum absorption wavelengths of these dyes in various solvents were determined. The theoretical calculations of the molecules in the ground state were performed with the density functional theory/Becke 3-parameter and Lee–Yang–Parr/6-311G(d,p) method by using the Gaussian 0.9 W program. The results were compared with the corresponding experimental data. Acid-base and substituent effects on the absorption spectra of dyes were also examined and reported. Note de contenu : - EXPERIMENTAL : General - Synthesis of 1a-e and 2a-e - Synthesis of disazo dyes (3a-e) - Theoretical calculation method - RESULTS AND DISCUSSION : Basic properties of compounds - Structural properties - IR spectral studies and tautomerism - 1H-NMR spectral studies - UV-vis absorption studies (substituent and solvent effects) - UV-vis absorption studies (acid and base effects) - Table 1 : Elemental analysis of 3a-e dyes - Table 2 : FTIR data for 3a-e dyes - Table 3 : 1H NMR data for 3a-e dyes - Table 4 : Experimental and theoretical UV-vis spectrum analysis data of compounds and the oscillator strengths (f) and molar extinction coefficients (e) of compounds using the TD-DFT method at B3LYP/6-311(d,p) level - Table 5 : Absorption maxima of 3a-e dyes in acidic and basic solutions DOI : https://doi.org/10.1111/cote.12524 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12524 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36098 [article]

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Preparation of polyurethane acrylate-based titanium dioxide pigment and its use in blue light-curable ink / Chenlong Wang in COLORATION TECHNOLOGY, Vol. 137, N° 4 (12/07/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 4 (12/07/2021) . - p. 348-360 Titre : Preparation of polyurethane acrylate-based titanium dioxide pigment and its use in blue light-curable ink Type de document : texte imprimé Auteurs : Chenlong Wang, Auteur ; Kai Yan, Auteur ; Xun Luo, Auteur ; Shulan Jin, Auteur ; Lili Wang, Auteur ; Jun Luo, Auteur ; Jinhuan Zheng, Auteur Année de publication : 2021 Article en page(s) : p. 348-360 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Copolymère uréthane acrylate Dioxyde de titane Encre Lumière bleue Photoréticulation Pigments -- Synthèse Potentiel zeta Rhéologie Solidité de la couleur Taille des particules Index. décimale : 667.2 Colorants et pigments Résumé : Polyurethane acrylate-based titanium dioxide was used to prepare blue light-curable inks as both a white pigment to replace the original white pigment and as an oligomer. The polyurethane acrylate-based titanium dioxide was fabricated using a two-step method. In the first step, the titanium dioxide was grafted with γ-aminopropyltriethoxy silane, and the grafting process was studied. Second, amino-modified titanium dioxide was used to prepare polyurethane acrylate-based titanium dioxide, which was then used to configure the blue light-curable polyurethane acrylate-based titanium dioxide ink. Fourier Transform–infrared spectroscopy indicated that the amino-modified titanium dioxide and polyurethane acrylate-based titanium dioxide were prepared successfully. The content of the amino groups on the surface of the amino-modified titanium dioxide could be effectively controlled by adjusting the pH value. Moreover, by increasing the content of the amino groups, the viscosity decreased and the photopolymerisation efficiency increased, which was attributed to the formation of branched structures and the promoting effect of the amino groups on the titanium dioxide. The inks with decreased viscosity and branched structures displayed excellent cross-linking properties: viscoelastic transition was achieved within 10 seconds and the final moduli were in the range of 36-55 kPa. The cross-linking degree and rate were more than seven times those of unmodified ink. The ranges of elongation and stress were 95%-165% and 1.9-4.3 MPa, respectively, and the amino group content varied from 0% to 0.101%. In general, polyurethane acrylate-based titanium dioxide was shown to be suitable for blue light-curable ink. Note de contenu : - EXPERIMENTAL : Materials - Preparation of amino-modified titanium dioxide - Preparation of polyurethane acrylate-based titanium dioxide - Preparation of the blue-light-curable polyurethane acrylate-based titanium dioxide ink - Preparation of the blue light-curable polyurethane acrylate-based titanium dioxide composite films - Characteristics of amino group content on the surface of titanium dioxide - FT-IR - Particle size and zeta potential - Rheological performance of the blue light-curable polyurethane acrylate-based titanium dioxide ink - Photo-rheological performance of the blue light-curable polyurethane acrylate-based titanium dioxide ink - Tensile properties of the blue light-curable polyurethane acrylate-based titanium dioxide composite films - Measurement of colour fastness to crocking - RESULTS AND DISCUSSION : Preparation of amino-modified titanium dioxide - Properties of polyurethane acrylate-based titanium dioxide - Properties of blue light-curable polyurethane acrylate-based titanium dioxide ink and film - Table 1 : Effect of APS concentration on the particle size of original and modified titanium dioxide - Table 2 : Effect of reaction temperature on the particle size of original and modified titanium dioxide - Table 3 : Effect of pH value on th eparticle size of original and modified titanium dioxide DOI : https://doi.org/10.1111/cote.12532 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12532 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36099 [article]

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Vaseline treatment combined with a natural dye extract to enhance lip print contrast images / Titichaya Mebuathong in COLORATION TECHNOLOGY, Vol. 137, N° 4 (12/07/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 4 (12/07/2021) . - p. 361-367 Titre : Vaseline treatment combined with a natural dye extract to enhance lip print contrast images Type de document : texte imprimé Auteurs : Titichaya Mebuathong, Auteur ; Wongsakorn Kangsanan, Auteur ; Phawadol Chingthongkham, Auteur ; Sirinart Chomean, Auteur ; Praew Suppajariyawat, Auteur ; Chollanot Kaset, Auteur Année de publication : 2021 Article en page(s) : p. 361-367 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants végétaux Empreinte labiale Evaluation Imagerie (technique) Produits de contraste Vaseline Index. décimale : 667.2 Colorants et pigments Résumé : Fingerprinting and DNA comparisons are the most commonly used methods in criminal investigations. However, lip prints can also be used as a supplementary tool because of the uniqueness of morphological patterns. A lip print not only can be used for personal screening by its pattern, it also carries genetic information that enables personal identification. Nowadays, there are various kinds of plants that are used for biological and histological staining due to an increasing market value associated with their application and sustainability. This study assessed the ability of natural dye extract to develop latent lip print contrast images and to preserve DNA for short tandem repeat analysis. Results revealed that roselle extract showed potential for the development of vaseline-treated lip print contrast images on bond paper. Moreover, when roselle extract-stained paper was compared with unstained paper, short tandem repeat profiles were not affected. Therefore, such dyes could be utilised for the development of latent lip print contrast images and their application could be extensively used to establish a personal identification database for reference in criminal investigations. Note de contenu : - EXPERIMENTAL : Materials - Evaluation of natural plant extracts for the development of latent lip prints - Optimisation of roselle dye extracts to improve latent lip print contrast images - Assessment of residual DNA from rosel-stained lip prints - RESULTS AND DISCUSSION : Evaluation of natural plant extracts for the development of latent lip prints - Evaluation of natural plant extracts for the development of latent lip prints - Assessment of residual DNA from roselle-stained lip prints DOI : https://doi.org/10.1111/cote.12535 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12535 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36100 [article]

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An experimental study on dyeing of needle-punched polyethylene-terephthalate non-wovens / Muhammad Tauseef Khawar in COLORATION TECHNOLOGY, Vol. 137, N° 4 (12/07/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 4 (12/07/2021) . - p. 368-375 Titre : An experimental study on dyeing of needle-punched polyethylene-terephthalate non-wovens Type de document : texte imprimé Auteurs : Muhammad Tauseef Khawar, Auteur ; Muhammad Tausif, Auteur ; Munir Ashraf, Auteur ; Faheem Ahmad, Auteur ; Sheraz Ahmad, Auteur ; Farooq Azam, Auteur ; Mehran Khattak, Auteur Année de publication : 2021 Article en page(s) : p. 368-375 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Nontissés Nontissés -- Propriétés mécaniques Perméabilité Plan d'expérience Polyéthylène téréphtalate Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : The dyeing of non-wovens in fabric form is of interest for a range of applications especially aesthetics. In this work, needle-punched non-woven fabrics were prepared by employing polyethylene-terephthalate (PET) fibres of two different linear density and same mean fibre length in four different fibre linear density ratios and three different fabric mass areal densities, while keeping all other process and material variables constant. The objectives of the study were to find out the saturation point in the dyeing profile of needle-punched non-wovens by varying aforementioned process variables and, for the first time, compare different industrially relevant conventional fabric dyeing methods (Jet, Package and Jigger dyeing) in terms of physical, mechanical and colour fastness properties. In case of Jet and Package dyeing, non-woven fabric was successfully dyed without any structural reorientation while fabric sample deformation is reported in Jigger dyeing process. Furthermore, tensile strength (in newtons) of samples was increased, while air permeability (in mm/s) was decreased due to the slight compactness of structure after the dyeing process. Note de contenu : - MATERIALS AND METHODS : Non-woven fabrics samples - Preparation of non-woven fabric for dyeing - Testing - RESULTS AND DISCUSSION : Preliminary work - Effect of linear density of PET fibres in non-woven on K/S - Effect of mass areal density of non-wovens on K/S - Comparison of dyeing methods - Table 1 : Polyethylene-terephthalate (PET) fibre properties - Table 2 : Prepared non-woven sample details - Table 3 : Experimental design for the selection of best dyeing method DOI : https://doi.org/10.1111/cote.12533 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12533 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36101 [article]

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A comparative study of ozonation on aqueous reactive dyes and reactive-dyed cotton / Mengru Li in COLORATION TECHNOLOGY, Vol. 137, N° 4 (12/07/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 4 (12/07/2021) . - p. 376-388 Titre : A comparative study of ozonation on aqueous reactive dyes and reactive-dyed cotton Type de document : texte imprimé Auteurs : Mengru Li, Auteur ; Zhenglei He, Auteur ; Jie Xu, Auteur Année de publication : 2021 Article en page(s) : p. 376-388 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants réactifs Coton Le 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). Ozonation Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : Ozonation is increasingly being used and reported in recent years. This paper investigates ozonation on aqueous reactive dyes and their dyed cotton comparatively. The effects, including pH, temperature and initial dye concentration (for aqueous dyes)/water pick-up (for dyed cotton), on Reactive Blue FL-RN, Reactive Red FL-2BL and Reactive Yellow FL-2RN, were studied via Fourier Transform–infrared spectroscopy, ultraviolet-visible absorption and k/s curves. The kinetic results indicated that all the aqueous dyes were of pseudo-first order kinetics, while dyed cotton represented pseudo-secondary or pseudo-third order kinetics. Based on their different mechanisms, there was a dramatic gap between dyes and dyed cotton in ozonation performance. The curve of rate constant vs pH of dye ozonation exhibited a U-shape with the minimum value at pH 7, but for dyed cotton ozonation, the curve showed a Λ-shape optimised at pH 10. Also, high temperature resulted in hydrolysis of dyes in aqueous solution, whereas this was not applicable to dyed cotton. The effect of pick-up (0%-150% with an interval of 75%) on reactive-dyed cotton was greater than the effect of initial dye concentration (which varied from 120 to 40 mg/L) on the colour yield of aqueous reactive dyes. Note de contenu : - EXPERIMENTAL : Material - Apparatus - Pretreatments and dyeing of cotton fabrics - Ozonation - Analytical methods - Kinetics studies - RESULTS AND DISCUSSION : UV-vis absorption and K/S curves - Colour yield mechanism and FTIR analysis - Kinetics reaction order of ozonation - The change in rate constants with pH during the ozonation of reactive dyes and reactive-dyed cotton - The change in rate constants with temperature in the ozonation of reactive dyes and reactive-dyed cotton - The change in rate constants with initial dye concentration during the ozonation of reactive dyes and pick-up of ozonation on reactive-dyed cotton - Table 1 : Chemical structure λ max of the dyes' dominant sector DOI : https://doi.org/10.1111/cote.12534 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12534 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36102 [article]

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On the NH and CH acidities of toluidine isomers : theoretical description and practical consequences for the synthesis of certain aniline dyes / Vladimir Lukes in COLORATION TECHNOLOGY, Vol. 137, N° 4 (12/07/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 4 (12/07/2021) . - p. 389-398 Titre : On the NH and CH acidities of toluidine isomers : theoretical description and practical consequences for the synthesis of certain aniline dyes Type de document : texte imprimé Auteurs : Vladimir Lukes, Auteur ; Horst Hartmann, Auteur Année de publication : 2021 Article en page(s) : p. 389-398 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acides et bases, Théories des Aniline Colorants Oxydation Toluidine Index. décimale : 667.2 Colorants et pigments Résumé : For the toluidine isomers, amino group acidity represents a characteristic feature of these compounds in their electric neutral state. As demonstrated by theoretical calculations based on the quantum chemistry composite G4 method and density functional theory, the CH acidity of the methyl group is hidden under NH acidity. The transformation of toluidines into their mono- and bi-oxidised states significantly increases the acidity of the methyl group. This study indicates that the presence or absence of these deprotonated species in reaction mixtures will determine the CN or CC coupling toluidine products. In agreement with published synthetic approaches for aniline dyes, such as mauveine and fuchsine, the results obtained explain the alternative reaction pathways occurring during the oxidation of toluidine isomers. Note de contenu : - COMUTATIONAL METHODOLOGY - RESULTS AND DISCUSSION : Thermodynamics of the toluidine acid-base reaction - Theoretical pKa values of toluidine oxidation states - Oxidation states and the reactivity of toluidine - Table 1 : Reaction G4 Gibbs free energies for selected acid-basic steps (energies in kJ mol-1) - Table 2 : The predicted pKa values from the isodesmic reaction and G4 (integral equation formalism-polarisable continuum model) calculations DOI : https://doi.org/10.1111/cote.12536 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12536 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36103 [article]

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A salt-free pad-irradiate-pad-steam reactive dyeing process for cotton fabric and the influence of cationising conditions on its coloration / Chengbing Yu in COLORATION TECHNOLOGY, Vol. 137, N° 4 (12/07/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 4 (12/07/2021) . - p. 399-406 Titre : A salt-free pad-irradiate-pad-steam reactive dyeing process for cotton fabric and the influence of cationising conditions on its coloration Type de document : texte imprimé Auteurs : Chengbing Yu, Auteur ; Yuanqiu Liu, Auteur ; Yilin Lu, Auteur ; Kaixin Tao, Auteur ; Zhong Yi, Auteur Année de publication : 2021 Article en page(s) : p. 399-406 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chlorure de 3-chloro-2-hydroxypropyltriméthylammonium Colorants réactifs Coton Le 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). Photostabilité Résistance à l'abrasion Résistance au lavage Teinture -- Fibres textiles Teinture au tampon Index. décimale : 667.3 Teinture et impression des tissus Résumé : The salt-free reactive dyeing of cotton fabric meets the need of the modern textile industry and overcomes the problems posed by salt usage. In this study, a pad-irradiate-pad-steam (PIPS) process for the salt-free dyeing of cotton fabric with a reactive dye was applied. In this process, 3-chloro-2-hydroxypropyltrimethylammonium chloride (CHPTMAC) was used to modify the fabric with cations under microwave heating. Then, the cationic fabric was dyed using a reactive dye. The influence of the cationising conditions in the PIPS process on the K/S value of the dyed cotton fabric was investigated. The results showed that the CHPTMAC concentration, the mole ratio of sodium hydroxide to CHPTMAC, the microwave irradiation power and the treatment time had significant effects on the dyeing of cotton fabric. Also, fastness to light, washing, and rubbing of the dyed cotton fabric was satisfactory. Note de contenu : - MATERIALS AND METHODS : Materials and reagents - Dyeing - Determination of dye fixation percentage - Fastness determination - RESULTS AND DISCUSSION : Influence of CHPTMAC concentration on the dyeing process - Influence of mole ratio of sodiumhydroxide to CHPTMAC on the dyeing process - Influence of microwave irradiation power on the dyeing process - Influence of treatment time on the dyeing process - Table 1 : Dyeing method comparison of the pad-irradiate-pad-steeam (PIPS) process with the conventional pad-dry-pad-steam (PDPS) process - Table 2 : Temperature of the cotton fabrics after microwave treatment - Table 3 : Fastness to light, washing and rubbing of dyed cotton fabric DOI : https://doi.org/10.1111/cote.12537 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12537 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36104 [article]

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Separation and identification of commercial reactive dyes with hydrophilic interaction liquid chromatography and quadrupole time-of-flight mass spectrometry / Yixin Liu in COLORATION TECHNOLOGY, Vol. 137, N° 4 (12/07/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 4 (12/07/2021) . - p. 407-417 Titre : Separation and identification of commercial reactive dyes with hydrophilic interaction liquid chromatography and quadrupole time-of-flight mass spectrometry Type de document : texte imprimé Auteurs : Yixin Liu, Auteur ; Xinyi Sui, Auteur ; Julio E. Teràn, Auteur ; Lisa Parillo-Chapman, Auteur ; Mary Ankeny, Auteur Année de publication : 2021 Article en page(s) : p. 407-417 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chromatographie en phase liquide Colorants -- Identification Colorants réactifs Séparation (technologie) Solutions aqueuses (chimie) Spectrométrie de masse Index. décimale : 667.2 Colorants et pigments Résumé : The separation and identification of colourants from aqueous matrices could potentially benefit the coloration industry. In this work, we report a new method that combines hydrophilic interaction liquid chromatography (HILIC) and high-resolution mass spectrometry (HRMS) for reactive dye separation and identification without employing ion-pairing agents. The conditions outlined allowed the successful separation of a mixture of four commercial reactive dyes in an aqueous solution, which consisted of CI Reactive Black 5, CI Reactive Orange 35, CI Reactive Blue 49 and CI Reactive Red 31. To further demonstrate the feasibility of this new method, we conducted deeper research into the analysis of CI Reactive Red 31 and its hydrolysis products. Based on the high efficiency of HILIC for polar compounds, and its combination with HRMS, we were able to identify several isomers of CI Reactive Red 31 and its derivatives, which were further characterised by tandem mass spectrometry. This method could potentially benefit chemical evaluations in dye applications, including synthetic processes, because it provides reliable results and simplified operation conditions compared with common traditional high-performance liquid chromatography methods. Note de contenu : - EXPERIMENTAL : Materials - Sample preparation - Instrumentation - RESULTS AND DISCUSSION : Separation and identification of different reactive dye mixtures by HILIC-QTOF-MS - HILIC-QTOF-MS characterisation of RR31 before and after hydrolysis treatment - Table 1 : Hydrophilic interaction liquid chromatography method used for the separation of CI Reactive Red 31 and its hydrolysis products - Table 2 : A summary of retention time (tR, min) and percentage area (%A) of the peaks DOI : https://doi.org/10.1111/cote.12539 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12539 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36105 [article]

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