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Title: Enlightening the influence of mordant, dyeing technique and photodegradation on the colour hue of textiles dyed with madder – A chromatographic and spectrometric approach
Authors: Manhita, Ana
Ferreira, Vanda
Vargas, Helena
Ribeiro, Isabel
Candeias, António
Teixeira, Dora
Ferreira, Teresa
Dias, Cristina
Editors: Sneddon, J.
Keywords: Madder (Rubia tinctorum)
Issue Date: 2011
Publisher: Elsevier
Citation: A. Manhita et al. / Microchemical Journal 98 (2011) 82–90
Abstract: Wool samples were dyed with madder and alum, copper, and iron salts at different concentration by premordanting (MD) and simultaneous mordanting (M+D) procedures. Samples were artificially aged to identify the influence of the mordant on the madder chromophores photodegradation. A set of analytical techniques was used for complete characterisation of the dyed fibres before and after light exposure, which included colour and chromophore analysis (colourimetry and LC-ESI-MS/MS analysis), determination of mordant ions amounts in the fibres (FAAS and ICP-OES analysis), morphological characterisation of the fibres and punctual chemical analysis (SEM-EDS studies). Fibre colour hue was found to be dependent on the mordant ion nature, mordant bath concentration and dyeing procedure. Mordant ion quantification showed that the uptake of metal ion by the fibres is relatively small, with the Cu ion presenting the highest affinity for the fibre. MD method yields fibres with higher amounts of metal ions and larger chromophore chromatographic peak areas corresponding, in general, to stronger colour hues. Photodegradation was more severe in alum mordant samples and in the first 480 h of light exposure. Chromophore degradation rates are unequal and dependent on the mordant nature, contributing for colour changes observed after light exposure.
Type: article
Appears in Collections:QUI - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
MED - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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