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Saffron is a yellow substance which is extracted from the stigmas of Crocus sativus L. and isused in painting, cooking and medicine. In this paper six components (trans and cis crocins) with carotenoidstructures were separated from natural saffron by HPLC and were characterised by their absorption andemission spectra. Photochemical and thermal processes which degrade the dye were also investigated. Theeffect of light promoted the cis ⇄ trans isomerization, while the thermal effect detached the glycosyl moieties

international journal of photoenergy

Photochemical and thermal degradation of a naturally occurring dye used in artistic painting. A chromatographic, spectrophotometric and fluorimetric study on saffron