Photo-stability of a flavonoid dye in presence of aluminium ions. (March 2019)

• Record Type: Journal Article
• Authors: Villela, Alexandre; van Vuuren, Monique S.A.; Willemen, Hendra M.; Derksen, Goverdina C.H.; van Beek, Teris A.
• Is Part Of: Dyes and pigments. Volume 162(2019)
• Page Start: 222
• Page End: 231
• Publication Date: 2019-03
• Subjects: Weld -- Reseda luteola -- Flavonoid -- Luteolin -- Natural dye -- Light-fastness; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2018.10.021
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: The main colouring compounds of the dye plant weld ( Reseda luteola L.) are the flavones luteolin (lut ), lut -7- O -glucoside andlut -7, 3ʹ- O -diglucoside. Alum (an aluminium salt)-premordanted wool dyed with weld leads to yellow colours that are of low resistance to light. The photo-stability oflut in aerated methanol–water 8:2 (v/v) solution upon irradiation with light above 300 nm was studied at differentlut –Al 3+ ratios. Experiments using extracts of weld to dye wool premordanted with increasing quantities of aluminium salts were also carried out. The photo-stability oflut in the polar protic solvent and the photo-resistance (light-fastness) of the colour of weld-dyed wool decrease with increasing concentrations of aluminium ions. Thus, the lower the [Al 3+ ] used for mordanting the wool, the more light-fast its colour. Lowering the [Al 3+ ] appears to have no negative influence on the wash-fastness of the colour. As the gain in light-fastness by the use of low [Al 3+ ] to premordant the wool is not extensive, however, this does not seem to be a way to meet today's requirement of light-fastness of the colours of dyed textiles by itself. Nevertheless, it may be part of a bigger strategy to address the need for increased light-fastness of the colour of wool dyed with weld. Implementation of this approach by dyers is expected to clarify whether it results in benefits for textile dyeing practice. Highlights: Photo-stability of luteolin decreases with increasing concentrations of Al ions Light-fastness of colour of weld-dyed wool also decreases with increasing [Al 3+ ] The lower the [Al 3+ ] used for mordanting the wool, the more light-fast its colour Using low [Al 3+ ] limits the obtainable yellow colours This approach could be of technical, environmental and financial benefit