Bing‐Huei Chen, T. Chen, J. Chien
Nov 1, 1994
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Influential Citations
85
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Quality indicators
Journal
Journal of Agricultural and Food Chemistry
Abstract
The thermoisomerization and iodine-catalyzed photoisomerization of all-trans-α- and all-trans-β-carotene were lrinetically 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 o C or iodine/light treatment may fit the reversible first-order model. 9-cis and 13-cis were the major α-carotene isomers formed during heating, while 13,15-di-cis was favored during iodine-catalyzed photoisomerization