The role of glycosides in the light-stabilization of 3-hydroxyflavone (flavonol) dyes as revealed by HPLC - HAL-SHS - Sciences de l'Homme et de la Société Accéder directement au contenu
Article Dans Une Revue Microchimica Acta Année : 2010

The role of glycosides in the light-stabilization of 3-hydroxyflavone (flavonol) dyes as revealed by HPLC

Résumé

Before the advent of synthetic dyes, textiles were colored primarily with extracts of plants, many of which, in the case of yellow colors, were flavonoids. One important Asian yellow dye source was buds from the pagoda tree (Sophora japonica). Using reversed phase HPLC to separate the flavonoid components of plants and of dyed textiles, and UV/Visible and mass spectrometry to detect and identify them, we have shown that the buds of pagoda trees (Sophora japonica) contain an enzyme that converts light-stable rutin, the 3-O-rutinoside of quercetin, to light-unstable quercetin. This work provides an explanation for why 3-O-substituted, rather than unsubstituted, 3-hydroxyflavones, are generally, in our experience, found in extracts of historical textiles; it also shows how, i.e., by heat inactivation of glycosidases, 3-O-substituted hydroxyflavones could have been selected for. Some other dyeproducing plants, e.g., Reseda luteola and Flaveria haumanii, also appear to contain glycosidases. The need for proper processing of dyestuffs, e.g., by heat treatment, was probably recognized by dyers in ancient times, even if the processes were not understood.
Analyses et discussion sur la composition chimique et les solidités lumière relatives de plantes à colorants jaunes flavonoïdes d'importance historique.
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Dates et versions

halshs-00974060 , version 1 (05-04-2014)

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  • HAL Id : halshs-00974060 , version 1

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Xian Zhang, Dominique Cardon, Juan Cabrera, Richard Laursen. The role of glycosides in the light-stabilization of 3-hydroxyflavone (flavonol) dyes as revealed by HPLC. Microchimica Acta, 2010, 169, pp.327-334. ⟨halshs-00974060⟩
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