Abstract
A dilute solution of H 2O 2 expedites the reddening process of orange-yellow florets from dyer's saffron capitula. The catalysis proceeds stoichiometrically: both incubation time and H 2O 2 composition become crucial factors for the bathoshift reaction, and a value of 0.184 μ m H 2O 2 is calculated from the double-reciprocal plots of H 2O 2 concentration vs velocity of carthamin production at pH 5.0. Inhibition tests, with various antioxidants, indicate that the bathochromic colour shift is controlled by electron-chain reactions. The results are evaluated for practical application to prepare the raw material of carthamin dye.
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