title: Separation and identification of carotenoids and their oxidation products in the extracts of human plasma.
abstract: Eighteen carotenoids as well as vitamin A and two forms of vitamin E (gamma- and alpha-tocopherol) have been separated from extracts of human plasma by high-performance liquid chromatography (HPLC) on reversed-phase and sillca-based nitrile-bonded columns. In the order of chromatographic elution on a C18 reversed-phase column, the carotenoids were identified as (3R,3'R,6'R)-beta, epsilon-carotene-3,3'-diol [(3R,3'R,6'R)-lutein], (3R,3'R)-beta, beta-carotene-3,3'-diol [(3R,3'R)-zeaxanthin], 5,6-dihydroxy-5,6-dihydro-psi,psi-carotene, 3-hydroxy-2',3'-didehydro-beta,epsilon-caroten-3-ol, 3-hydroxy-beta-carotene,psi,psi-carotene, 7,8-dihydro-psi,psi-carotene, beta,psi-carotene, 7,8,7',8'-tetrahydro-psi,psi-carotene, beta,epsilon-carotene, beta,beta-carotene, 7,8,11,12,7',8'-hexahydro-psi,psi-carotene, and 7,8,11,12,7',8'-11',12'-octahydro-psi,psi-carotene. The polar carotenoids, which eluted in the vicinity of lutein and were unresolved on the C18 column, have been separated on a nitrile-bonded column employing isocratic HPLC conditions. In the order of elution, the carotenoids were epsilon,epsilon-carotene-3,3'-dione, 3'-hydroxy-epsilon,epsilon-caroten-3-one, 5,6-dihydroxy-5,6-dihydro-psi,psi-carotene, 3-hydroxy-beta,epsilon-caroten-3'-one, (all-E,3R,3'R,6'R)-lutein, (all-E,3R,3'R)-zeaxanthin, and (all-E,3R,3'S,6'R)-beta,epsilon-carotene-3,3'-diol (3'-epilutein) followed by several geometrical isomers of lutein and zeaxanthin.
authors.affiliation: Nutrient Composition Laboratory, U.S. Department of Agriculture, ARS, Beltsville, Maryland 20705.
authors.forename: F
authors.initials: F
authors.lastname: Khachik
authors.forename: G R
authors.initials: GR
authors.lastname: Beecher
authors.forename: M B
authors.initials: MB
authors.lastname: Goli
authors.forename: W R
authors.initials: WR
authors.lastname: Lusby
authors.forename: J C
authors.initials: JC
authors.lastname: Smith
mesh_terms: D002338:Carotenoids / Q000097:blood* / Q000302:isolation & purification; D002851:Chromatography, High Pressure Liquid; D006801:Humans; D013058:Mass Spectrometry; D010084:Oxidation-Reduction; D010949:Plasma / Q000737:chemistry*; D014801:Vitamin A / Q000097:blood; D014810:Vitamin E / Q000097:blood
chemical_list: D014801:Vitamin A; D014810:Vitamin E; D002338:Carotenoids