80779-34-6Relevant articles and documents
Kinetic Studies on the Thermal (Z/E)-Isomerization of C40-Carotenoids
Molnar, Peter,Kortvelyesi, Tarnas,Matus, Zoltan,Szabolca, Jozsef
, p. 801 - 841 (2007/10/03)
Rates of thermal (Z/E)-isomerization among all-E-, 9(9')Z-, 13Z-, 13'Z- and 15Z-isomers of zeaxanthin (1), natural violaxanthin (2), "semi-synthetic" violaxanthin (2a), capsorubin (3), capsanthin (4) and lutein epoxide (5) have been measured at temperatures over the range 333.4-368.4 K.From the specific rate constants calculated on the basis of four kinetic models, the Arrhenius and activation parameters have been derived.The effect of the different end groups and different solvents on the composition of the (Z/E)-equilibrium mixtures have been investigated as well.The rates of the isomerization reactions have been measured by HPLC, UV/VIS spectrophotometry and "classic" column chromatography.