期刊
FOOD CHEMISTRY
卷 73, 期 2, 页码 131-137出版社
ELSEVIER SCI LTD
DOI: 10.1016/S0308-8146(01)00107-8
关键词
astaxanthin; isomerization; kinetics; first-order reversible reaction
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 degreesC or in a mixture of dichloromethane and methanol (25:75) at 10 degreesC, 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,) of 105.8 +/-4.2 kJ/mol. (C) 2001 Elsevier Science Ltd. All rights reserved.
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