Abstract
Thermal decomposition of 3-(1,4-epidioxy-4-methyl-1,4-dihydro-1-naphthyl)propionic acid ( 2 ) has been used to measure both the physical and chemical quenching rate constants of 1O 2 (k Q and k R, respectively) by water-soluble 8,8′-diapocarotenoids such as crocin ( 1a ) and its derivatives ( 1b , c ). The value of k Q was found to be slightly lower than the diffusion controlled rate constant in all the solvents examined, whereas k R showed strong dependence on the medium, going from ca. 10 8 in H 2O to 10 6 M −1s −1 in DMF and DMSO. These findings suggest that both energy- and electron-transfer mechanisms are involved in the quenching of O 2 ( 1Δ g) by crocinoids.
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