Degradation studies of CI Reactive Blue 19 on biodegraded cellulosic fabrics via liquid chromatography-photodiode array detection coupled to high resolution mass spectrometry / Nadia Sultana in COLORATION TECHNOLOGY, Vol. 135, N° 6 (12/2019)  

[article]  inCOLORATION TECHNOLOGY > Vol. 135, N° 6 (12/2019) . - p. 475-483 Titre : Degradation studies of CI Reactive Blue 19 on biodegraded cellulosic fabrics via liquid chromatography-photodiode array detection coupled to high resolution mass spectrometry Type de document : texte imprimé Auteurs : Nadia Sultana, Auteur ; Kelsey Williams, Auteur ; Mary Ankeny, Auteur ; Nelson R. Vinueza, Auteur Année de publication : 2019 Article en page(s) : p. 475-483 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse quantitative (chimie) Bleu (couleur) Colorants -- Analyse Colorants réactifs -- Biodégradation Colorants réactifs -- Détérioration Fibres cellulosiques Teinture -- Fibres textiles synthétiques Index. décimale : 667.2 Colorants et pigments Résumé : When textile substrates biodegrade in landfills, the fate of textile colorants is unknown, and potentially poses an ecotoxic threat. In this study, we developed a systematic analytical method to evaluate the biodegradation of reactive dyes, the most common class of dye applied to cotton fabrics. The cotton fabrics were dyed with CI Reactive Blue 19 and biodegraded in soil in a laboratory-controlled environment over intervals of 45 and 90 days. A dye isolation method using a low concentration of alkali (0.15% sodium hydroxide) was developed and applied (80°C for 1 hour) to isolate intact and degraded dye from the fabric samples. To quantify the intact dye isolated from the fabric samples, a quantification method was then developed using liquid chromatography-photodiode array detection. The quantification method provided excellent linearity (R2 = 0.9997 ± 0.0002), accuracy (% error = -2% ± 4), precision (% coefficient of variation = 2% ± 4) and sensitivity (lower limit of quantification = 0.4 ± 0.2 µg/mL) for concentrations ranging from 1 to 50 µg/mL. After validation, the method was applied and showed a reduction of dye in biodegraded samples (after 45 and 90 days) compared with undegraded control samples (0 days). To characterise the isolated dye degradation product, quadrupole time-of-flight tandem mass spectrometry was utilised. Analysis showed that the degradation product was formed by losing a -SO3- group from the intact hydrolysed form of the dye, creating a more hydrophobic degradation product compared with the intact hydrolysed form of dye. Note de contenu : - EXPERIMENTAL : Materials and reagents - Biodegradation of dyes fabric samples - Dye isolation method - Synthesis of hydrolysed dye standard - Quantitative monitoring of degradation - RESULTS AND DISCUSSION : Characterisation of synthesised hydrolysed dye standard - Analysis of undegraded control sample - Validation of quantification method - Quantification of dyes on biodegraded samples DOI : 10.1111/cote.12440 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12440 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33379 [article]

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Dimerised heterobifunctional reactive dyes. Part 1 : characterisation using quadrupole time-of-light mass spectrometry / Nadia Sultana in COLORATION TECHNOLOGY, Vol. 134, N° 6 (12/2018)  

[article]  inCOLORATION TECHNOLOGY > Vol. 134, N° 6 (12/2018) . - p.470-477 Titre : Dimerised heterobifunctional reactive dyes. Part 1 : characterisation using quadrupole time-of-light mass spectrometry Type de document : texte imprimé Auteurs : Nadia Sultana, Auteur ; Yixin Liu, Auteur ; Harold S. Freeman, Auteur ; Nelson R. Vinueza, Auteur Année de publication : 2018 Article en page(s) : p.470-477 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bleu (couleur) Colorants -- Analyse Colorants réactifs Dimères Hexaméthylène diamine Rouge (couleur) Spectrométrie de masse Index. décimale : 667.2 Colorants et pigments Résumé : As part of an approach to enhancing the efficiency of reactive dye adsorption on cellulosic fibres at low electrolyte levels, commercially available dyes were dimerised using hexamethylenediamine (HMDA) as a linking group. A key component of this work involved using high-resolution mass spectrometry (HRMS) to characterise a group of polysulphonated heterobifunctional monochlorotriazine/vinyl sulphone reactive dyes (CI Reactive Yellow 176, CI Reactive Red 239, CI Reactive Blue 221, CI Reactive Red 194 and CI Reactive Blue 222) and their dimeric analogs. In this respect, dimeric dye ions of differently charged states were observed using HRMS-negative electrospray ionisation in combination with quadrupole time-of-flight mass spectrometry. For example, HRMS showed that the HMDA-linked reaction products were mixtures of the target (unhydrolysed) dimers, hydrolysed dimers, monoreacted products and hydrolysed unreacted dyes, with CI Reactive Yellow 176 and CI Reactive Red 194 producing the desired unhydrolysed dimers. Note de contenu : - EXPERIMENTAL : Materials and reagents - Reactive dye dimer formation- Mass spectrometry - RESULTS AND DISCUSSION : Characterisation of parent dyes - Characterisation of dimeric structures DOI : 10.1111/cote.12368 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12368 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31381 [article]

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