Identification of zeinoxanthin in orange juices.
The monohydroxycarotenoid fraction of orange juice has been isolated by TLC and studied to determine whether the carotenoid accompanying beta-cryptoxanthin was alpha-cryptoxanthin or zeinoxanthin. The provitamin A carotenoid alpha-cryptoxanthin has been widely reported in orange juice, although its identification has been carried out mainly on the basis of its spectral features, which are virtually identical with those of its non-provitamin A isomer, zeinoxanthin. As a result of a study of the UV-vis and mass spectra of the monohydroxycarotenoid fraction and of the methylation test, it was concluded that the carotenoid accompanying beta-cryptoxanthin was the non-provitamin A carotenoid zeinoxanthin.
Meléndez-Martínez
Antonio J
AJ
Department of Nutrition and Food Science, Faculty of Pharmacy, University of Seville, Seville, Spain.
Britton
George
G
Vicario
Isabel M
IM
Heredia
Francisco J
FJ
D001628:Beverages / Q000032:analysis*; D002855:Chromatography, Thin Layer; D032084:Citrus sinensis / Q000737:chemistry*; D065366:Cryptoxanthins; D005638:Fruit / Q000737:chemistry*; D014975:Lutein / Q000737:chemistry; D013058:Mass Spectrometry; D013053:Spectrophotometry; D024341:Xanthophylls; D019207:beta Carotene / Q000031:analogs & derivatives* / Q000032:analysis / Q000737:chemistry
D065366:Cryptoxanthins; D024341:Xanthophylls; D019207:beta Carotene; C503770:zeinoxanthin; D014975:Lutein