39937-23-0Relevant articles and documents
Thermal degradation kinetics of bixin in an aqueous model system
Rios, Alessandro De O.,Borsarelli, Claudio D.,Mercadante, Adriana Z.
, p. 2307 - 2311 (2005)
The kinetics of the thermal degradation of the natural cis carotenoid bixin in a water/ethanol (8:2) solution was studied as a function of temperature (70-125°C), using high-performance liquid chromatography. The curves for the decay of bixin and formation of products (e.g., di-cis and all-trans isomers and a C17 degradation compound) did not adjust well to a first-order rate law, but very good fits were obtained using a biexponential model. This mathematical modeling gave the rate constant values for the formation of the primary products from bixin, and the energy barrier for each step was obtained. The di-cis isomers were formed immediately (15 kcal/mol) together with the decay of bixin, followed by a slow consumption, indicating their role as reaction intermediates. In fact, the di-cis isomers could easily revert to bixin (Ea ≈ 3 kcal/mol) or yield the primary C17 degradation product, with an energy barrier of 6.5 kcal/mol. In turn, 24 kcal/mol was necessary for the Bix - all-trans step, explaining its slower formation.
Holmes,Bromund
, (1936)
NMR, MS and X-Ray Crystal Structure Determination of the Bixin Family of Apocarotenoids
Kelly, David R.,Edwards, Alice A.,Parkinson, John A.,Trotter, James,Olovsson, Gunnar,et al.
, p. 2640 - 2697 (2007/10/03)
-
