Comparing different light-degradation approaches for the degradation of crystal violet and eosin Y

Organic colourants have important applications in many fields. Their photostability is an characteristic. Several methods to study photodegradation were compared this work. Eosin Y (C.I. Generic name: Acid Red 87, EY) and crystal violet Name: Basic Violet 3, CV) used as test compounds, both solution dyed on silk. Commonly applied included, viz. Xenotest, Microfading-Tester, light-box (Spectrolinker) experiments. A novel method was based a liquid-core-waveguide (LCW) cell. After textile, extraction performed using dimethyl sulfoxide (DMSO). The degraded solutions extracts analysed with liquid chromatography combined diode-array detection mass spectrometry. degradation products between techniques. Degradation the LCW cell progressed much faster than standard tests (Xenotest Spectrolinker) could be online, without need for or sample transfer. of CV comparable its tests. For EY, there clear difference mechanisms in-solution on-textile samples. This due matrix incomplete extraction. Because light sources different experiments differed energy spectral emission, results not quantitatively compared. However, formed shown independent source. Therefore, attractive rapid efficient studies into chemistry photodegradation.