Abstract
Abstract The isomerization of cis -astaxanthins in organic solvents, a reverse reaction of the isomerization of trans -astaxanthin, was investigated. HPLC analysis revealed that cis -astaxanthins could be also isomerized to produce trans -astaxanthin and the other cis -astaxanthin. The results showed that the isomerization of trans -astaxanthin to cis -astaxanthin was a reversible reaction and followed first-order reversible reaction kinetics. The effect of temperature on the isomerization reaction of trans -astaxanthin, dissolved in dimethyl sulfoxide at 20–70°C or in a mixture of dichloromethane and methanol (25:75) at 10°C, respectively, was also studied. The results indicated that increasing temperature could markedly increase the reaction rate of trans -astaxanthin isomerization. Temperature-dependence of the isomerization rate constants of trans -astaxanthins could be described by the Arrhenius equation with activation energy ( E a ) of 105.8±4.2 kJ/mol.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
