Title of article :
Kinetics for the reversible isomerization reaction of trans-astaxanthin
Author/Authors :
Yuan، نويسنده , , Jian-Ping and Chen، نويسنده , , Feng، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2001
Pages :
7
From page :
131
To page :
137
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 (Ea) of 105.8±4.2 kJ/mol.
Keywords :
Astaxanthin , Kinetics , First-order reversible reaction , Isomerization
Journal title :
Food Chemistry
Serial Year :
2001
Journal title :
Food Chemistry
Record number :
1949270
Link To Document :
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