Journal of Agricultural and Food Chemistry p. 2391 - 2397 (1994)
Update date:2022-08-05
Topics: Isomerization Heating Experimental Kinetic model αand β-Carotene Illumination
Chen, B. H.
Chen, T. M.
Chien, J. T.
The thermoisomerization and iodine-catalyzed photoisomerization of all-trans-α- and all-trans-β-carotene were kinetically studied using regression models. Carotene samples were heated at varied temperatures or exposed to a 20 W light for varied lengths of time. Isomerization and degradation reactions were monitored using HPLC with diode array detection. Four cis isomers of β-carotene and three cis isomers of α-carotene were separated and detected. The degradations of both carotenes under heating at 150 deg C or iodine/light treatment may fit the reversible first- order model. 9-cis and 13-cis were the major β-carotene isomers formed during heating, while 13,15-di-cis was favored during iodine-catalyzed photoisomerization. The formation of 9-cis and 13-cis form all-trans-α-carotene was dependent upon the extent of heat or iodine/light treatment, and the latter was formed in greater amount under either treatment. Keywords: α-Carotene; β-carotene; thermoisomerization; photoisomerization; kinetic study
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