Efficient double glycoconjugation to naturalize high molecular weight disperse dyes

Abstract Commercially available Disperse Orange 29 ( 1a ) and Disperse Red 1 ( 2a ) were elaborated to glycoconjugated species, following a new version of a previously-described ‘naturalisation’ procedure. Glutamic acid was chosen to achieve a double glycoconjugation, which is essential to give to the original disperse dye a water solubility suitable for reaching optimal dyeing conditions. UV–vis plot of the ‘naturalised’ species showed negligible differences when compared to those of the commercial dyes.