PMID: 8615356May 1, 1996Paper

Bioavailability of a natural isomer mixture compared with synthetic all-trans beta-carotene in human serum

The American Journal of Clinical Nutrition
Ami Ben-Amotz, Y Levy

Abstract

The unicellular alga Dunaliella bardawil was shown previously to contain very high concentrations of beta-carotene composed of about equal amounts of the all-trans and 9-cis isomers, which differ in their physicochemical features and antioxidative activity. The uptake of alpha- and beta-carotenes, oxycarotenoids, and other lipophilic substances from a basal diet supplemented with synthetic beta-carotene or dry D. bardawil power was studied in humans. Subjects were given a basal diet supplemented daily with 40 mg beta-carotene, synthetic or natural, for a relatively short period of 14 d. Serum analyses at the end of this period detected mainly oxycarotenoids, and to a lesser extent all-trans beta-carotene and alpha-carotene, but not 9-cis beta-carotene. Retinol was increased by the all-trans beta-carotene diet. A high amount of oxidized dienic, lipophilic polar products was exhibited in HPLC predominantly in sera from the placebo and synthetic all-trans beta-carotene groups by strong, short ultraviolet absorbance peaks of 232 nm. The preferential serum absorption of all-trans beta-carotene over 9-cis beta-carotene, in parallel with the appearance of a high concentration of oxidized dienic products with supplementation of the bas...Continue Reading

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Citations

May 9, 2000·The American Journal of Clinical Nutrition·J B Lavine
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